TY  - JOUR
AU  - Wang, Yunfeng
AU  - Zhu, Qijian
AU  - Li, Junhao
AU  - Milićević, Bojana R.
AU  - Zhou, Rongfu
AU  - Liu, Shuanglai
AU  - Zhang, Qiuhong
AU  - Huo, Jiansheng
AU  - Zhou, Jianbang
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11079
AB  - Mn4+-activated fluoride is one of the most important red phosphors for white light-emitting diodes (WLEDs) with high color rendering index (CRI). Due to a lack of water resistance, their potential applications are limited. Although surface coating strategies improve the waterproof stability of fluoride red phosphors, they have downsides. It was found that Nb5+ plays an important role in improving the water resistance of Mn4+-activated oxyfluorides by preventing the hydrolysis of [MnF6]2-. In this work, the influence of Nb5+ on the waterproof stability of Mn4+-activated fluorides was explored. A set of synthesized K2Ta1-xNbxF7:Mn4+ phosphors exhibit tunable and superior water resistance. The photoluminescence (PL) intensity of the representative sample K2Ta0.6Nb0.4F7:5%Mn4+ remains nearly 100% of its initial value even after being immersed in water for 60 min, which is significantly higher than the commercial K2SiF6:Mn4+ red phosphor (8.7%). Our findings open up new possibilities for the development of waterproof fluoride red phosphors. © 2023 Elsevier Ltd and Techna Group S.r.l.
T2  - Ceramics International
T1  - Key role of Nb5+ in achieving water-resistant red emission in K2Ta1-xNbxF7:Mn4+ phosphors
VL  - 49
IS  - 16
SP  - 27024
EP  - 27029
DO  - 10.1016/j.ceramint.2023.05.244
ER  - 

@article{
author = "Wang, Yunfeng and Zhu, Qijian and Li, Junhao and Milićević, Bojana R. and Zhou, Rongfu and Liu, Shuanglai and Zhang, Qiuhong and Huo, Jiansheng and Zhou, Jianbang",
year = "2023",
abstract = "Mn4+-activated fluoride is one of the most important red phosphors for white light-emitting diodes (WLEDs) with high color rendering index (CRI). Due to a lack of water resistance, their potential applications are limited. Although surface coating strategies improve the waterproof stability of fluoride red phosphors, they have downsides. It was found that Nb5+ plays an important role in improving the water resistance of Mn4+-activated oxyfluorides by preventing the hydrolysis of [MnF6]2-. In this work, the influence of Nb5+ on the waterproof stability of Mn4+-activated fluorides was explored. A set of synthesized K2Ta1-xNbxF7:Mn4+ phosphors exhibit tunable and superior water resistance. The photoluminescence (PL) intensity of the representative sample K2Ta0.6Nb0.4F7:5%Mn4+ remains nearly 100% of its initial value even after being immersed in water for 60 min, which is significantly higher than the commercial K2SiF6:Mn4+ red phosphor (8.7%). Our findings open up new possibilities for the development of waterproof fluoride red phosphors. © 2023 Elsevier Ltd and Techna Group S.r.l.",
journal = "Ceramics International",
title = "Key role of Nb5+ in achieving water-resistant red emission in K2Ta1-xNbxF7:Mn4+ phosphors",
volume = "49",
number = "16",
pages = "27024-27029",
doi = "10.1016/j.ceramint.2023.05.244"
}

Wang, Y., Zhu, Q., Li, J., Milićević, B. R., Zhou, R., Liu, S., Zhang, Q., Huo, J.,& Zhou, J.. (2023). Key role of Nb5+ in achieving water-resistant red emission in K2Ta1-xNbxF7:Mn4+ phosphors. in Ceramics International, 49(16), 27024-27029.
https://doi.org/10.1016/j.ceramint.2023.05.244

Wang Y, Zhu Q, Li J, Milićević BR, Zhou R, Liu S, Zhang Q, Huo J, Zhou J. Key role of Nb5+ in achieving water-resistant red emission in K2Ta1-xNbxF7:Mn4+ phosphors. in Ceramics International. 2023;49(16):27024-27029.
doi:10.1016/j.ceramint.2023.05.244 .

Wang, Yunfeng, Zhu, Qijian, Li, Junhao, Milićević, Bojana R., Zhou, Rongfu, Liu, Shuanglai, Zhang, Qiuhong, Huo, Jiansheng, Zhou, Jianbang, "Key role of Nb5+ in achieving water-resistant red emission in K2Ta1-xNbxF7:Mn4+ phosphors" in Ceramics International, 49, no. 16 (2023):27024-27029,
https://doi.org/10.1016/j.ceramint.2023.05.244 . .

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  - 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 . .