TY  - JOUR
AU  - Milićević, Bojana R.
AU  - Chen, Yingyuan
AU  - Li, Junhao
AU  - Dramićanin, Miroslav
AU  - Zhou, Jianbang
AU  - Wu, Mingmei
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10148
AB  - We report an organic solvent–assisted (OSA) co-precipitation strategy for the production of Mn4+-activated K2TiF6 phosphor. The phosphor particle size was controlled through the selection of organic solvents with an alcohol functional group and different carbon chain lengths used in the synthesis. The synergistic effect of the organic solvent and hydrofluoric acid results in large smoothed hexagonal-shaped crystal sheets of particles that become larger as the carbon chain length of the organic solvent increases. The photoluminescence (PL) properties of K2TiF6:Mn powders strongly depend on the size and thickness of the particles. The addition of n-butanol during the synthesis increases the emission intensity of K2TiF6:Mn by 208%. The PL quantum efficiency of phosphors prepared using the n-butanol-assisted strategy is much higher (98.2%) than that of conventionally prepared phosphors (89.9%). Our findings demonstrate a way to prepare the K2TiF6:Mn phosphor with targeted morphology and very high quantum efficiency and also provide the route for the optimization of all Mn4+-activated fluoride phosphors used in white light-emitting diodes.
T2  - Dalton Transactions
T1  - Organic solvent-assisted co-precipitation synthesis of red-emitting K2TiF6:Mn phosphors with improved quantum efficiency and optimized morphology
VL  - 51
IS  - 4
SP  - 1378
EP  - 1383
DO  - 10.1039/d1dt03679c
ER  - 

@article{
author = "Milićević, Bojana R. and Chen, Yingyuan and Li, Junhao and Dramićanin, Miroslav and Zhou, Jianbang and Wu, Mingmei",
year = "2022",
abstract = "We report an organic solvent–assisted (OSA) co-precipitation strategy for the production of Mn4+-activated K2TiF6 phosphor. The phosphor particle size was controlled through the selection of organic solvents with an alcohol functional group and different carbon chain lengths used in the synthesis. The synergistic effect of the organic solvent and hydrofluoric acid results in large smoothed hexagonal-shaped crystal sheets of particles that become larger as the carbon chain length of the organic solvent increases. The photoluminescence (PL) properties of K2TiF6:Mn powders strongly depend on the size and thickness of the particles. The addition of n-butanol during the synthesis increases the emission intensity of K2TiF6:Mn by 208%. The PL quantum efficiency of phosphors prepared using the n-butanol-assisted strategy is much higher (98.2%) than that of conventionally prepared phosphors (89.9%). Our findings demonstrate a way to prepare the K2TiF6:Mn phosphor with targeted morphology and very high quantum efficiency and also provide the route for the optimization of all Mn4+-activated fluoride phosphors used in white light-emitting diodes.",
journal = "Dalton Transactions",
title = "Organic solvent-assisted co-precipitation synthesis of red-emitting K2TiF6:Mn phosphors with improved quantum efficiency and optimized morphology",
volume = "51",
number = "4",
pages = "1378-1383",
doi = "10.1039/d1dt03679c"
}

Milićević, B. R., Chen, Y., Li, J., Dramićanin, M., Zhou, J.,& Wu, M.. (2022). Organic solvent-assisted co-precipitation synthesis of red-emitting K2TiF6:Mn phosphors with improved quantum efficiency and optimized morphology. in Dalton Transactions, 51(4), 1378-1383.
https://doi.org/10.1039/d1dt03679c

Milićević BR, Chen Y, Li J, Dramićanin M, Zhou J, Wu M. Organic solvent-assisted co-precipitation synthesis of red-emitting K2TiF6:Mn phosphors with improved quantum efficiency and optimized morphology. in Dalton Transactions. 2022;51(4):1378-1383.
doi:10.1039/d1dt03679c .

Milićević, Bojana R., Chen, Yingyuan, Li, Junhao, Dramićanin, Miroslav, Zhou, Jianbang, Wu, Mingmei, "Organic solvent-assisted co-precipitation synthesis of red-emitting K2TiF6:Mn phosphors with improved quantum efficiency and optimized morphology" in Dalton Transactions, 51, no. 4 (2022):1378-1383,
https://doi.org/10.1039/d1dt03679c . .

TY  - JOUR
AU  - Wang, Zhengliang
AU  - Yang, Zhiyu
AU  - Wang, Nan
AU  - Zhou, Qiang
AU  - Zhou, Jianbang
AU  - Ma, Li
AU  - Wang, Xiaojun
AU  - Xu, Yiqing
AU  - Brik, Mikhail G.
AU  - Dramićanin, Miroslav
AU  - Wu, Mingmei
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8791
AB  - Crystal phosphors have many unique advantages compared with powdery ones. Herein, room-temperature-grown millimeter-sized single-crystal phosphors of Cs2XF6:Mn4+ (X = Ge, Si, and Ti) with remarkably higher external quantum efficiency than the corresponding powdery samples are reported. In addition, as compared with the powdery ones, the crystal samples exhibit much better stability toward water under different pH conditions. The red light-emitting diodes (LEDs) based on Cs2XF6:Mn4+ crystals show significantly improved luminous efficiency than those based on their corresponding powders. An assembled white LED device composed of the two layers of phosphors, i.e., the crystal (such as Cs2GeF6:Mn4+) and commercial Y3Al5O12:Ce3+, on a blue chip exhibits intense warm white light with high luminous efficiency (up to 193 lm W−1), high color rendering indexes (88), and low correlated color temperatures (3107 K). Hence, these crystals with greatly improved efficiency and stability can be potentially applied in high-quality LED backlighting display and white LED lighting, especially inside the micro-LED devices. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
T2  - Advanced Optical Materials
T1  - Single‐Crystal Red Phosphors: Enhanced Optical Efficiency and Improved Chemical Stability for wLEDs
VL  - 8
IS  - 6
SP  - 1901512
DO  - 10.1002/adom.201901512
ER  - 

@article{
author = "Wang, Zhengliang and Yang, Zhiyu and Wang, Nan and Zhou, Qiang and Zhou, Jianbang and Ma, Li and Wang, Xiaojun and Xu, Yiqing and Brik, Mikhail G. and Dramićanin, Miroslav and Wu, Mingmei",
year = "2020",
abstract = "Crystal phosphors have many unique advantages compared with powdery ones. Herein, room-temperature-grown millimeter-sized single-crystal phosphors of Cs2XF6:Mn4+ (X = Ge, Si, and Ti) with remarkably higher external quantum efficiency than the corresponding powdery samples are reported. In addition, as compared with the powdery ones, the crystal samples exhibit much better stability toward water under different pH conditions. The red light-emitting diodes (LEDs) based on Cs2XF6:Mn4+ crystals show significantly improved luminous efficiency than those based on their corresponding powders. An assembled white LED device composed of the two layers of phosphors, i.e., the crystal (such as Cs2GeF6:Mn4+) and commercial Y3Al5O12:Ce3+, on a blue chip exhibits intense warm white light with high luminous efficiency (up to 193 lm W−1), high color rendering indexes (88), and low correlated color temperatures (3107 K). Hence, these crystals with greatly improved efficiency and stability can be potentially applied in high-quality LED backlighting display and white LED lighting, especially inside the micro-LED devices. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",
journal = "Advanced Optical Materials",
title = "Single‐Crystal Red Phosphors: Enhanced Optical Efficiency and Improved Chemical Stability for wLEDs",
volume = "8",
number = "6",
pages = "1901512",
doi = "10.1002/adom.201901512"
}

Wang, Z., Yang, Z., Wang, N., Zhou, Q., Zhou, J., Ma, L., Wang, X., Xu, Y., Brik, M. G., Dramićanin, M.,& Wu, M.. (2020). Single‐Crystal Red Phosphors: Enhanced Optical Efficiency and Improved Chemical Stability for wLEDs. in Advanced Optical Materials, 8(6), 1901512.
https://doi.org/10.1002/adom.201901512

Wang Z, Yang Z, Wang N, Zhou Q, Zhou J, Ma L, Wang X, Xu Y, Brik MG, Dramićanin M, Wu M. Single‐Crystal Red Phosphors: Enhanced Optical Efficiency and Improved Chemical Stability for wLEDs. in Advanced Optical Materials. 2020;8(6):1901512.
doi:10.1002/adom.201901512 .

Wang, Zhengliang, Yang, Zhiyu, Wang, Nan, Zhou, Qiang, Zhou, Jianbang, Ma, Li, Wang, Xiaojun, Xu, Yiqing, Brik, Mikhail G., Dramićanin, Miroslav, Wu, Mingmei, "Single‐Crystal Red Phosphors: Enhanced Optical Efficiency and Improved Chemical Stability for wLEDs" in Advanced Optical Materials, 8, no. 6 (2020):1901512,
https://doi.org/10.1002/adom.201901512 . .

TY  - JOUR
AU  - Li, Xiaohui
AU  - Zhou, Lei
AU  - Hong, Junyu
AU  - He, Shiman
AU  - Jing, Xiping
AU  - Dramićanin, Miroslav
AU  - Shi, Jianxin
AU  - Wu, Mingmei
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9016
AB  - Modulation of structural order-disorder transition and structural oxygen defects can provide fundamental insights in the optimization of luminescence performances of phosphors. In this study, the luminescence of Ba3ZnTa2O9(BZT) was systematically elucidated, including the emission arising from the charge transfer (Nb5+/Ta5+ O2-) and anti-site oxygen defect emission due to the B-site disordering (defect type: [2ZnNb3-+ 3Vo2+]), as corroborated by the electronic structural calculations and detailed experiments. We present a two-step design for the optimization of luminescence properties of Ba3ZnTa2O9phosphor. In the first step, the B-site equivalent doping (Ta5+substituted by Nb5+) was used to modulate the B-site atomic arrangement, which induced the formation of the cubic phase with B-site full disordering. In the second step, the A-site nonequivalent doping (Ba2+substituted by Eu3+) was used to decrease the oxygen defect concentration. After the two-step optimization, the photoluminescence excitation spectrum of Ba3-yEuyZnNb2O9(y= 0.1) shows a broad band excitation (300-400 nm), which is a good match with the near-UV LED chip emission. Even more importantly, the emission spectrum covers the entire visible spectral region and exhibits a remarkably enhanced emission intensity (a 40 times enhancement when compared to that of the intrinsic BZT). The fabricated LED device comprising an n-UV chip (= 370 nm) and a single-component Ba3-yEuyZnNb2O9(y= 0.1) phosphor coating emits a warm white light with a low correlated color temperature (CCT = 4813 K) and a good color rendering index (Ra= 82.36).
T2  - Journal of Materials Chemistry C
T1  - Structural modulation induced intensity enhancement of full color spectra: A case of Ba3ZnTa2-xNbxO9:Eu3+phosphors
VL  - 8
IS  - 20
SP  - 6715
EP  - 6723
DO  - 10.1039/D0TC01201G
ER  - 

@article{
author = "Li, Xiaohui and Zhou, Lei and Hong, Junyu and He, Shiman and Jing, Xiping and Dramićanin, Miroslav and Shi, Jianxin and Wu, Mingmei",
year = "2020",
abstract = "Modulation of structural order-disorder transition and structural oxygen defects can provide fundamental insights in the optimization of luminescence performances of phosphors. In this study, the luminescence of Ba3ZnTa2O9(BZT) was systematically elucidated, including the emission arising from the charge transfer (Nb5+/Ta5+ O2-) and anti-site oxygen defect emission due to the B-site disordering (defect type: [2ZnNb3-+ 3Vo2+]), as corroborated by the electronic structural calculations and detailed experiments. We present a two-step design for the optimization of luminescence properties of Ba3ZnTa2O9phosphor. In the first step, the B-site equivalent doping (Ta5+substituted by Nb5+) was used to modulate the B-site atomic arrangement, which induced the formation of the cubic phase with B-site full disordering. In the second step, the A-site nonequivalent doping (Ba2+substituted by Eu3+) was used to decrease the oxygen defect concentration. After the two-step optimization, the photoluminescence excitation spectrum of Ba3-yEuyZnNb2O9(y= 0.1) shows a broad band excitation (300-400 nm), which is a good match with the near-UV LED chip emission. Even more importantly, the emission spectrum covers the entire visible spectral region and exhibits a remarkably enhanced emission intensity (a 40 times enhancement when compared to that of the intrinsic BZT). The fabricated LED device comprising an n-UV chip (= 370 nm) and a single-component Ba3-yEuyZnNb2O9(y= 0.1) phosphor coating emits a warm white light with a low correlated color temperature (CCT = 4813 K) and a good color rendering index (Ra= 82.36).",
journal = "Journal of Materials Chemistry C",
title = "Structural modulation induced intensity enhancement of full color spectra: A case of Ba3ZnTa2-xNbxO9:Eu3+phosphors",
volume = "8",
number = "20",
pages = "6715-6723",
doi = "10.1039/D0TC01201G"
}

Li, X., Zhou, L., Hong, J., He, S., Jing, X., Dramićanin, M., Shi, J.,& Wu, M.. (2020). Structural modulation induced intensity enhancement of full color spectra: A case of Ba3ZnTa2-xNbxO9:Eu3+phosphors. in Journal of Materials Chemistry C, 8(20), 6715-6723.
https://doi.org/10.1039/D0TC01201G

Li X, Zhou L, Hong J, He S, Jing X, Dramićanin M, Shi J, Wu M. Structural modulation induced intensity enhancement of full color spectra: A case of Ba3ZnTa2-xNbxO9:Eu3+phosphors. in Journal of Materials Chemistry C. 2020;8(20):6715-6723.
doi:10.1039/D0TC01201G .

Li, Xiaohui, Zhou, Lei, Hong, Junyu, He, Shiman, Jing, Xiping, Dramićanin, Miroslav, Shi, Jianxin, Wu, Mingmei, "Structural modulation induced intensity enhancement of full color spectra: A case of Ba3ZnTa2-xNbxO9:Eu3+phosphors" in Journal of Materials Chemistry C, 8, no. 20 (2020):6715-6723,
https://doi.org/10.1039/D0TC01201G . .

TY  - JOUR
AU  - Dramićanin, Miroslav
AU  - Milićević, Bojana R.
AU  - Đorđević, Vesna R.
AU  - Ristić, Zoran
AU  - Zhou, Jianbang
AU  - Milivojević, Dušan
AU  - Papan, Jelena
AU  - Brik, Mikhail G.
AU  - Ma, Chong‐Geng
AU  - Srivastava, Alok M
AU  - Wu, Mingmei
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8360
AB  - Luminescence of monoclinic lithium metatitanate (Li2TiO3) powders activated with different quantities of Mn4+ is studied in detail. Its strong deep-red emission arising from the Mn4+ 2Eg → 4A2g spin forbidden transition is centered at around 688 nm and is suitable for luminescence thermometry. Structural and electron paramagnetic resonance analyses show that Mn4+ ions are equally distributed in two almost identical Ti4+ sites in which they are octahedrally coordinated by six oxygen ions. Calculations based on the exchange charge model of the crystal field provided values of Racah parameters (B=760 cm−1, C= 2993 cm−1), crystal-field splitting Dq= 2043 cm−1, and the nephelauxetic parameter β1=0.9775. The maximal quantum efficiency of 24.1% at room temperature is found for 0.126% Mn4+ concentration. Temperature quenching of emission occurs by a cross-over via 4T2 excited state of the Mn4+ ions with T1/2=262 K and is quite favorable for the application in the lifetime-based luminescence thermometry since relative changes in emission decay values are exceptionally-large (around 3.21% at room temperature). We derived theoretical expressions for the temperature dependence of the absolute and relative sensitivities and discuss the influence of host material properties on lifetime sensitivities. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
T2  - ChemistrySelect
T1  - Li2TiO3:Mn4+ Deep‐Red Phosphor for the Lifetime‐Based Luminescence Thermometry
VL  - 4
IS  - 24
SP  - 7067
EP  - 7075
DO  - 10.1002/slct.201901590
ER  - 

@article{
author = "Dramićanin, Miroslav and Milićević, Bojana R. and Đorđević, Vesna R. and Ristić, Zoran and Zhou, Jianbang and Milivojević, Dušan and Papan, Jelena and Brik, Mikhail G. and Ma, Chong‐Geng and Srivastava, Alok M and Wu, Mingmei",
year = "2019",
abstract = "Luminescence of monoclinic lithium metatitanate (Li2TiO3) powders activated with different quantities of Mn4+ is studied in detail. Its strong deep-red emission arising from the Mn4+ 2Eg → 4A2g spin forbidden transition is centered at around 688 nm and is suitable for luminescence thermometry. Structural and electron paramagnetic resonance analyses show that Mn4+ ions are equally distributed in two almost identical Ti4+ sites in which they are octahedrally coordinated by six oxygen ions. Calculations based on the exchange charge model of the crystal field provided values of Racah parameters (B=760 cm−1, C= 2993 cm−1), crystal-field splitting Dq= 2043 cm−1, and the nephelauxetic parameter β1=0.9775. The maximal quantum efficiency of 24.1% at room temperature is found for 0.126% Mn4+ concentration. Temperature quenching of emission occurs by a cross-over via 4T2 excited state of the Mn4+ ions with T1/2=262 K and is quite favorable for the application in the lifetime-based luminescence thermometry since relative changes in emission decay values are exceptionally-large (around 3.21% at room temperature). We derived theoretical expressions for the temperature dependence of the absolute and relative sensitivities and discuss the influence of host material properties on lifetime sensitivities. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim",
journal = "ChemistrySelect",
title = "Li2TiO3:Mn4+ Deep‐Red Phosphor for the Lifetime‐Based Luminescence Thermometry",
volume = "4",
number = "24",
pages = "7067-7075",
doi = "10.1002/slct.201901590"
}

Dramićanin, M., Milićević, B. R., Đorđević, V. R., Ristić, Z., Zhou, J., Milivojević, D., Papan, J., Brik, M. G., Ma, C., Srivastava, A. M.,& Wu, M.. (2019). Li2TiO3:Mn4+ Deep‐Red Phosphor for the Lifetime‐Based Luminescence Thermometry. in ChemistrySelect, 4(24), 7067-7075.
https://doi.org/10.1002/slct.201901590

Dramićanin M, Milićević BR, Đorđević VR, Ristić Z, Zhou J, Milivojević D, Papan J, Brik MG, Ma C, Srivastava AM, Wu M. Li2TiO3:Mn4+ Deep‐Red Phosphor for the Lifetime‐Based Luminescence Thermometry. in ChemistrySelect. 2019;4(24):7067-7075.
doi:10.1002/slct.201901590 .

Dramićanin, Miroslav, Milićević, Bojana R., Đorđević, Vesna R., Ristić, Zoran, Zhou, Jianbang, Milivojević, Dušan, Papan, Jelena, Brik, Mikhail G., Ma, Chong‐Geng, Srivastava, Alok M, Wu, Mingmei, "Li2TiO3:Mn4+ Deep‐Red Phosphor for the Lifetime‐Based Luminescence Thermometry" in ChemistrySelect, 4, no. 24 (2019):7067-7075,
https://doi.org/10.1002/slct.201901590 . .

TY  - JOUR
AU  - Li, Xiaohui
AU  - Milićević, Bojana R.
AU  - Dramićanin, Miroslav
AU  - Jing, Xiping
AU  - Tang, Qiang
AU  - Shi, Jianxin
AU  - Wu, Mingmei
PY  - 2019
UR  - http://xlink.rsc.org/?DOI=C9TC00159J
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8087
AB  - Single-component white light phosphors with a broad and full color spectrum are urgently required to overcome residual problems with commercial phosphors. In this paper, we describe how Eu3+, as the dopant of Sr3ZnTa2O9 (SZT), plays an important role in structural modulation (including structural order-disorder and intrinsic oxygen defects), as demonstrated by electronic structural calculations and systematic experiments. Furthermore, D-5(0) F-7(2) emission of Eu3+ provides the red component of the emission spectrum and increases the color rendering index of SZT:Eu3+ phosphors. Consequently, the resulting phosphor SZT:10%Eu3+ shows significantly enhanced emission intensity, and its broadband emission covers the entire visible region from 400 nm to 720 nm. A fabricated LED device using a near-ultraviolet 370 nm chip coated with a single-component, the SZT:10%Eu3+ phosphor, shows warm white emission with a high color rendering index (R-a = 82).
T2  - Journal of Materials Chemistry C
T1  - Eu3+-Activated Sr3ZnTa2O9 single-component white light phosphors: emission intensity enhancement and color rendering improvement
VL  - 7
IS  - 9
SP  - 2596
EP  - 2603
DO  - 10.1039/C9TC00159J
ER  - 

@article{
author = "Li, Xiaohui and Milićević, Bojana R. and Dramićanin, Miroslav and Jing, Xiping and Tang, Qiang and Shi, Jianxin and Wu, Mingmei",
year = "2019",
abstract = "Single-component white light phosphors with a broad and full color spectrum are urgently required to overcome residual problems with commercial phosphors. In this paper, we describe how Eu3+, as the dopant of Sr3ZnTa2O9 (SZT), plays an important role in structural modulation (including structural order-disorder and intrinsic oxygen defects), as demonstrated by electronic structural calculations and systematic experiments. Furthermore, D-5(0) F-7(2) emission of Eu3+ provides the red component of the emission spectrum and increases the color rendering index of SZT:Eu3+ phosphors. Consequently, the resulting phosphor SZT:10%Eu3+ shows significantly enhanced emission intensity, and its broadband emission covers the entire visible region from 400 nm to 720 nm. A fabricated LED device using a near-ultraviolet 370 nm chip coated with a single-component, the SZT:10%Eu3+ phosphor, shows warm white emission with a high color rendering index (R-a = 82).",
journal = "Journal of Materials Chemistry C",
title = "Eu3+-Activated Sr3ZnTa2O9 single-component white light phosphors: emission intensity enhancement and color rendering improvement",
volume = "7",
number = "9",
pages = "2596-2603",
doi = "10.1039/C9TC00159J"
}

Li, X., Milićević, B. R., Dramićanin, M., Jing, X., Tang, Q., Shi, J.,& Wu, M.. (2019). Eu3+-Activated Sr3ZnTa2O9 single-component white light phosphors: emission intensity enhancement and color rendering improvement. in Journal of Materials Chemistry C, 7(9), 2596-2603.
https://doi.org/10.1039/C9TC00159J

Li X, Milićević BR, Dramićanin M, Jing X, Tang Q, Shi J, Wu M. Eu3+-Activated Sr3ZnTa2O9 single-component white light phosphors: emission intensity enhancement and color rendering improvement. in Journal of Materials Chemistry C. 2019;7(9):2596-2603.
doi:10.1039/C9TC00159J .

Li, Xiaohui, Milićević, Bojana R., Dramićanin, Miroslav, Jing, Xiping, Tang, Qiang, Shi, Jianxin, Wu, Mingmei, "Eu3+-Activated Sr3ZnTa2O9 single-component white light phosphors: emission intensity enhancement and color rendering improvement" in Journal of Materials Chemistry C, 7, no. 9 (2019):2596-2603,
https://doi.org/10.1039/C9TC00159J . .

TY  - JOUR
AU  - Yan, Jing
AU  - Zhang, Ziwang
AU  - Milićević, Bojana R.
AU  - Li, Junhao
AU  - Liang, Qiongyun
AU  - Zhou, Jianbang
AU  - Wang, Yunfeng
AU  - Shi, Jianxin
AU  - Wu, Mingmei
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8346
AB  - The local crystal structure engineering becomes an important strategy to design new phosphors with enhanced optical and thermal performance of white light-emitting diodes. Herein, a series of Na3Sc2(PO4)3: Eu2+ and KyNa2.97-ySc2(PO4)3: 0.03Eu2+ phosphors were synthesized via traditional high temperature solid-state reaction method. X-ray powder diffraction analysis and Rietveld refinement provide insight in the detailed crystal structure. Furthermore, Eu2+ doped Na3Sc2(PO4)3 exhibits bright blue emission in 400–540 nm spectral range with a maximum value at ~ 460 nm under n-UV light excitation. The concentration quenching mechanism of Eu2+ in Na3Sc2(PO4)3 is certified to be a dipole-dipole interaction. Additionally, crystal structure tailoring is a potential strategy to design new phosphors for particular applications. Therefore, the effects of K+ substitution on the structure and photoluminescence of Eu2+ activated Na3Sc2(PO4)3 is presented in detail. Rietveld refinement data revealed that unit cell volume and Na/K–O band length increase when K+ occupy the Na+ sites. This sensitive local structure resulted in a considerable enhancement of the photoluminescence intensity of Eu2+. Incorporation of K+ in the crystal structure is a feasible route to realize fine-tuning of emission color and broaden the color gamut. In the meantime, Na2.7K0.27Sc2(PO4)3: 0.03Eu2+ phosphor exhibits excellent thermal stability at high temperature over a significant radiative recombination of energy transfer from traps to Eu2+. These results confirm that Na2.7K0.27Sc2(PO4)3: 0.03Eu2+ phosphor might be used as a blue component in n-UV chip activated white light-emitting diodes for the next-generation of indoor solid-state lighting applications. © 2019 Elsevier B.V.
T2  - Optical Materials
T1  - The enhancement of emission intensity and enlargement of color gamut by a simple local structure substitution with highly thermal stability preserved
VL  - 95
SP  - 109201
DO  - 10.1016/j.optmat.2019.109201
ER  - 

@article{
author = "Yan, Jing and Zhang, Ziwang and Milićević, Bojana R. and Li, Junhao and Liang, Qiongyun and Zhou, Jianbang and Wang, Yunfeng and Shi, Jianxin and Wu, Mingmei",
year = "2019",
abstract = "The local crystal structure engineering becomes an important strategy to design new phosphors with enhanced optical and thermal performance of white light-emitting diodes. Herein, a series of Na3Sc2(PO4)3: Eu2+ and KyNa2.97-ySc2(PO4)3: 0.03Eu2+ phosphors were synthesized via traditional high temperature solid-state reaction method. X-ray powder diffraction analysis and Rietveld refinement provide insight in the detailed crystal structure. Furthermore, Eu2+ doped Na3Sc2(PO4)3 exhibits bright blue emission in 400–540 nm spectral range with a maximum value at ~ 460 nm under n-UV light excitation. The concentration quenching mechanism of Eu2+ in Na3Sc2(PO4)3 is certified to be a dipole-dipole interaction. Additionally, crystal structure tailoring is a potential strategy to design new phosphors for particular applications. Therefore, the effects of K+ substitution on the structure and photoluminescence of Eu2+ activated Na3Sc2(PO4)3 is presented in detail. Rietveld refinement data revealed that unit cell volume and Na/K–O band length increase when K+ occupy the Na+ sites. This sensitive local structure resulted in a considerable enhancement of the photoluminescence intensity of Eu2+. Incorporation of K+ in the crystal structure is a feasible route to realize fine-tuning of emission color and broaden the color gamut. In the meantime, Na2.7K0.27Sc2(PO4)3: 0.03Eu2+ phosphor exhibits excellent thermal stability at high temperature over a significant radiative recombination of energy transfer from traps to Eu2+. These results confirm that Na2.7K0.27Sc2(PO4)3: 0.03Eu2+ phosphor might be used as a blue component in n-UV chip activated white light-emitting diodes for the next-generation of indoor solid-state lighting applications. © 2019 Elsevier B.V.",
journal = "Optical Materials",
title = "The enhancement of emission intensity and enlargement of color gamut by a simple local structure substitution with highly thermal stability preserved",
volume = "95",
pages = "109201",
doi = "10.1016/j.optmat.2019.109201"
}

Yan, J., Zhang, Z., Milićević, B. R., Li, J., Liang, Q., Zhou, J., Wang, Y., Shi, J.,& Wu, M.. (2019). The enhancement of emission intensity and enlargement of color gamut by a simple local structure substitution with highly thermal stability preserved. in Optical Materials, 95, 109201.
https://doi.org/10.1016/j.optmat.2019.109201

Yan J, Zhang Z, Milićević BR, Li J, Liang Q, Zhou J, Wang Y, Shi J, Wu M. The enhancement of emission intensity and enlargement of color gamut by a simple local structure substitution with highly thermal stability preserved. in Optical Materials. 2019;95:109201.
doi:10.1016/j.optmat.2019.109201 .

Yan, Jing, Zhang, Ziwang, Milićević, Bojana R., Li, Junhao, Liang, Qiongyun, Zhou, Jianbang, Wang, Yunfeng, Shi, Jianxin, Wu, Mingmei, "The enhancement of emission intensity and enlargement of color gamut by a simple local structure substitution with highly thermal stability preserved" in Optical Materials, 95 (2019):109201,
https://doi.org/10.1016/j.optmat.2019.109201 . .

TY  - JOUR
AU  - Dolgov, Leonid
AU  - Hong, Junyu
AU  - Zhou, Lei
AU  - Li, Xiaohui
AU  - Li, Junhao
AU  - Đorđević, Vesna R.
AU  - Dramićanin, Miroslav
AU  - Shi, Jianxin
AU  - Wu, Mingmei
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8349
AB  - One of prospective ways for boosting efficiency of luminescent materials is their combination with noble metal nanoparticles. Collective, so-called plasmon, oscillations of surface electrons in a nanoparticle can resonantly interact with incident or fluorescent light and cause an increase in the light absorption cross section or radiative rate for an adjacent emitter. Plasmonic inorganic phosphors require gentle host crystallization at which added noble nanoparticles will not suffer from aggregation or oxidation. The prospective plasmonic Mg2TiO4:Mn4+ phosphor containing core@shell Ag@SiO2 nanoparticles is prepared here by spare low-temperature annealing of a sol-gel host precursor. It is revealed that Mn4+ luminescence nonmonotonously depends on the size and concentration of 40 and 70 nm silver nanoparticles. It is demonstrated that luminescence of the Mg2TiO4:Mn4+ phosphor can be up to a 1.5 times increase when Mn4+ excitation is supported by localized surface plasmon resonance in Ag@SiO2 nanoparticles. © 2019 American Chemical Society.
T2  - ACS Applied Materials and Interfaces
T1  - Efficient Luminescence Enhancement of Mg 2 TiO 4 :Mn 4+ Red Phosphor by Incorporating Plasmonic Ag@SiO 2 Nanoparticles
VL  - 11
IS  - 23
SP  - 21004
EP  - 21009
DO  - 10.1021/acsami.9b05781
ER  - 

@article{
author = "Dolgov, Leonid and Hong, Junyu and Zhou, Lei and Li, Xiaohui and Li, Junhao and Đorđević, Vesna R. and Dramićanin, Miroslav and Shi, Jianxin and Wu, Mingmei",
year = "2019",
abstract = "One of prospective ways for boosting efficiency of luminescent materials is their combination with noble metal nanoparticles. Collective, so-called plasmon, oscillations of surface electrons in a nanoparticle can resonantly interact with incident or fluorescent light and cause an increase in the light absorption cross section or radiative rate for an adjacent emitter. Plasmonic inorganic phosphors require gentle host crystallization at which added noble nanoparticles will not suffer from aggregation or oxidation. The prospective plasmonic Mg2TiO4:Mn4+ phosphor containing core@shell Ag@SiO2 nanoparticles is prepared here by spare low-temperature annealing of a sol-gel host precursor. It is revealed that Mn4+ luminescence nonmonotonously depends on the size and concentration of 40 and 70 nm silver nanoparticles. It is demonstrated that luminescence of the Mg2TiO4:Mn4+ phosphor can be up to a 1.5 times increase when Mn4+ excitation is supported by localized surface plasmon resonance in Ag@SiO2 nanoparticles. © 2019 American Chemical Society.",
journal = "ACS Applied Materials and Interfaces",
title = "Efficient Luminescence Enhancement of Mg 2 TiO 4 :Mn 4+ Red Phosphor by Incorporating Plasmonic Ag@SiO 2 Nanoparticles",
volume = "11",
number = "23",
pages = "21004-21009",
doi = "10.1021/acsami.9b05781"
}

Dolgov, L., Hong, J., Zhou, L., Li, X., Li, J., Đorđević, V. R., Dramićanin, M., Shi, J.,& Wu, M.. (2019). Efficient Luminescence Enhancement of Mg 2 TiO 4 :Mn 4+ Red Phosphor by Incorporating Plasmonic Ag@SiO 2 Nanoparticles. in ACS Applied Materials and Interfaces, 11(23), 21004-21009.
https://doi.org/10.1021/acsami.9b05781

Dolgov L, Hong J, Zhou L, Li X, Li J, Đorđević VR, Dramićanin M, Shi J, Wu M. Efficient Luminescence Enhancement of Mg 2 TiO 4 :Mn 4+ Red Phosphor by Incorporating Plasmonic Ag@SiO 2 Nanoparticles. in ACS Applied Materials and Interfaces. 2019;11(23):21004-21009.
doi:10.1021/acsami.9b05781 .

Dolgov, Leonid, Hong, Junyu, Zhou, Lei, Li, Xiaohui, Li, Junhao, Đorđević, Vesna R., Dramićanin, Miroslav, Shi, Jianxin, Wu, Mingmei, "Efficient Luminescence Enhancement of Mg 2 TiO 4 :Mn 4+ Red Phosphor by Incorporating Plasmonic Ag@SiO 2 Nanoparticles" in ACS Applied Materials and Interfaces, 11, no. 23 (2019):21004-21009,
https://doi.org/10.1021/acsami.9b05781 . .

TY  - JOUR
AU  - Zhou, Qiang
AU  - Dolgov, Leonid
AU  - Srivastava, Alok M
AU  - Zhou, Lei
AU  - Wang, Zhengliang
AU  - Shi, Jianxin
AU  - Dramićanin, Miroslav
AU  - Brik, Mikhail G.
AU  - Wu, Mingmei
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7638
AB  - Transition-metal activated phosphors are an important family of luminescent materials that can produce white light with an outstanding color rendering index and correlated color temperature for use in light-emitting diodes.  In recent years, work in this quite “hot” research field has focused on the development of Mn2+ and Mn4+ activated red phosphors. In this review article, we provide an overview of recent studies on Mn2+ and Mn4+ doped phosphors, including detailed synthesis routes (solid-state reaction and wet-chemical synthesis) and description of luminescence mechanisms and phosphors’ behaviors; discuss their promising applications in white light-emitting diodes; and present an extensive list of references to representative works in this field.
T2  - Journal of Materials Chemistry C
T1  - Mn 2+ and Mn 4+ red phosphors: synthesis, luminescence and applications in WLEDs. A review
VL  - 6
IS  - 11
SP  - 2652
EP  - 2671
DO  - 10.1039/C8TC00251G
ER  - 

@article{
author = "Zhou, Qiang and Dolgov, Leonid and Srivastava, Alok M and Zhou, Lei and Wang, Zhengliang and Shi, Jianxin and Dramićanin, Miroslav and Brik, Mikhail G. and Wu, Mingmei",
year = "2018",
abstract = "Transition-metal activated phosphors are an important family of luminescent materials that can produce white light with an outstanding color rendering index and correlated color temperature for use in light-emitting diodes.  In recent years, work in this quite “hot” research field has focused on the development of Mn2+ and Mn4+ activated red phosphors. In this review article, we provide an overview of recent studies on Mn2+ and Mn4+ doped phosphors, including detailed synthesis routes (solid-state reaction and wet-chemical synthesis) and description of luminescence mechanisms and phosphors’ behaviors; discuss their promising applications in white light-emitting diodes; and present an extensive list of references to representative works in this field.",
journal = "Journal of Materials Chemistry C",
title = "Mn 2+ and Mn 4+ red phosphors: synthesis, luminescence and applications in WLEDs. A review",
volume = "6",
number = "11",
pages = "2652-2671",
doi = "10.1039/C8TC00251G"
}

Zhou, Q., Dolgov, L., Srivastava, A. M., Zhou, L., Wang, Z., Shi, J., Dramićanin, M., Brik, M. G.,& Wu, M.. (2018). Mn 2+ and Mn 4+ red phosphors: synthesis, luminescence and applications in WLEDs. A review. in Journal of Materials Chemistry C, 6(11), 2652-2671.
https://doi.org/10.1039/C8TC00251G

Zhou Q, Dolgov L, Srivastava AM, Zhou L, Wang Z, Shi J, Dramićanin M, Brik MG, Wu M. Mn 2+ and Mn 4+ red phosphors: synthesis, luminescence and applications in WLEDs. A review. in Journal of Materials Chemistry C. 2018;6(11):2652-2671.
doi:10.1039/C8TC00251G .

Zhou, Qiang, Dolgov, Leonid, Srivastava, Alok M, Zhou, Lei, Wang, Zhengliang, Shi, Jianxin, Dramićanin, Miroslav, Brik, Mikhail G., Wu, Mingmei, "Mn 2+ and Mn 4+ red phosphors: synthesis, luminescence and applications in WLEDs. A review" in Journal of Materials Chemistry C, 6, no. 11 (2018):2652-2671,
https://doi.org/10.1039/C8TC00251G . .

TY  - JOUR
AU  - Li, Xiaohui
AU  - Zhou, Lei
AU  - Dramićanin, Miroslav
AU  - Tang, Qiang
AU  - Jing, Xiping
AU  - Shi, Jianxin
AU  - Xu, Yiqin
AU  - Wu, Mingmei
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7987
AB  - Broad emission with a full and continuous color spectrum realized by crystal engineering is extensively desired to simulate natural sunlight and improve the white color quality. Herein, new insight into the modulation of B site order-disorder and intrinsic oxygen defects for complex perovskite (A(3)BB(2)O(9)) Sr3-xScxZnNb2O9 (0 x 0.1) phosphors is demonstrated for broad-band emission via crystal engineering. We elucidate that the spectrum of Sr3ZnNb2O9 synthesized at an optimal temperature exhibits two emission bands under near-ultraviolet excitation ((ex) = 374 nm) which is readily available from near ultraviolet chips. The two broad emission bands can be ascribed to charge transfer from the empty 4d (t(2g))-orbitals of Nb5+ ions to the filled 2p-orbitals of O2- ions and the intrinsic oxygen defects. Further, as a proposed strategy to optimize the luminescence property of Sr3ZnNb2O9 (SZN), we realized A-site nonequivalent doping to induce B-site disordering and cancel the luminescence quenching which results from B site ordering. The A-site nonequivalent doping efficiently offsets intrinsic oxygen defects, as validated by systematic analyses of experiments and DFT calculations. Consequently, the novel phosphor Sr3-xScxZnNb2O9 (x = 0.1) shows a high color rendering index (R-a = 82.2) and negligible color shift. In addition, its emission intensity is enhanced by approximate to 70 times as compared to the pristine Sr3ZnNb2O9.
T2  - Journal of Materials Chemistry C
T1  - Broad-band emission of A3B′B′′2O9 complex perovskites (A = Ba, Sr; B′ = Zn; B′′ = Ta, Nb) realized by structural variations of the B site order–disorder
VL  - 6
IS  - 46
SP  - 12566
EP  - 12574
DO  - 10.1039/C8TC04874F
ER  - 

@article{
author = "Li, Xiaohui and Zhou, Lei and Dramićanin, Miroslav and Tang, Qiang and Jing, Xiping and Shi, Jianxin and Xu, Yiqin and Wu, Mingmei",
year = "2018",
abstract = "Broad emission with a full and continuous color spectrum realized by crystal engineering is extensively desired to simulate natural sunlight and improve the white color quality. Herein, new insight into the modulation of B site order-disorder and intrinsic oxygen defects for complex perovskite (A(3)BB(2)O(9)) Sr3-xScxZnNb2O9 (0 x 0.1) phosphors is demonstrated for broad-band emission via crystal engineering. We elucidate that the spectrum of Sr3ZnNb2O9 synthesized at an optimal temperature exhibits two emission bands under near-ultraviolet excitation ((ex) = 374 nm) which is readily available from near ultraviolet chips. The two broad emission bands can be ascribed to charge transfer from the empty 4d (t(2g))-orbitals of Nb5+ ions to the filled 2p-orbitals of O2- ions and the intrinsic oxygen defects. Further, as a proposed strategy to optimize the luminescence property of Sr3ZnNb2O9 (SZN), we realized A-site nonequivalent doping to induce B-site disordering and cancel the luminescence quenching which results from B site ordering. The A-site nonequivalent doping efficiently offsets intrinsic oxygen defects, as validated by systematic analyses of experiments and DFT calculations. Consequently, the novel phosphor Sr3-xScxZnNb2O9 (x = 0.1) shows a high color rendering index (R-a = 82.2) and negligible color shift. In addition, its emission intensity is enhanced by approximate to 70 times as compared to the pristine Sr3ZnNb2O9.",
journal = "Journal of Materials Chemistry C",
title = "Broad-band emission of A3B′B′′2O9 complex perovskites (A = Ba, Sr; B′ = Zn; B′′ = Ta, Nb) realized by structural variations of the B site order–disorder",
volume = "6",
number = "46",
pages = "12566-12574",
doi = "10.1039/C8TC04874F"
}

Li, X., Zhou, L., Dramićanin, M., Tang, Q., Jing, X., Shi, J., Xu, Y.,& Wu, M.. (2018). Broad-band emission of A3B′B′′2O9 complex perovskites (A = Ba, Sr; B′ = Zn; B′′ = Ta, Nb) realized by structural variations of the B site order–disorder. in Journal of Materials Chemistry C, 6(46), 12566-12574.
https://doi.org/10.1039/C8TC04874F

Li X, Zhou L, Dramićanin M, Tang Q, Jing X, Shi J, Xu Y, Wu M. Broad-band emission of A3B′B′′2O9 complex perovskites (A = Ba, Sr; B′ = Zn; B′′ = Ta, Nb) realized by structural variations of the B site order–disorder. in Journal of Materials Chemistry C. 2018;6(46):12566-12574.
doi:10.1039/C8TC04874F .

Li, Xiaohui, Zhou, Lei, Dramićanin, Miroslav, Tang, Qiang, Jing, Xiping, Shi, Jianxin, Xu, Yiqin, Wu, Mingmei, "Broad-band emission of A3B′B′′2O9 complex perovskites (A = Ba, Sr; B′ = Zn; B′′ = Ta, Nb) realized by structural variations of the B site order–disorder" in Journal of Materials Chemistry C, 6, no. 46 (2018):12566-12574,
https://doi.org/10.1039/C8TC04874F . .