TY  - JOUR
AU  - Zhang, Qiuhong
AU  - Wei, Xiang
AU  - Zhou, Jianbang
AU  - Milićević, Bojana R.
AU  - Lin, Litian
AU  - Huo, Jiansheng
AU  - Li, Junhao
AU  - Ni, Haiyong
AU  - Xia, Zhiguo
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10937
AB  - Technological progress has accelerated the researches into broadband near-infrared (NIR) luminescent materials as next-generation intelligent NIR light sources; however, poor thermal stability restricts the applications of NIR phosphors. Herein, new insights into Cr3+-activated NIR phosphors with improved thermal stability are provided. The photoluminescence intensity originating from the 4T2→4A2 broadband emission of CaLu2Al4SiO12:Cr3+ (CLAS:Cr) with optimal electron occupation (4T2/2E) increases up to 118% at 475 K compared with that at room temperature, which is the best for Cr3+-activated broadband NIR phosphor. Accordingly, new ideas for the design of thermally stable phosphors are proposed by optimizing the thermal population between 4T2 and 2E states and electron migration from 2E to 4T2 state. Finally, multifunctional applications of CLAS:Cr in NIR fluorescence intensity ratio thermometry, X-ray detection, NIR phosphor-converted light-emitting diodes, and bio-imaging are demonstrated.
T2  - Advanced Optical Materials
T1  - Thermal Stability Improvement of Cr3+-Activated Broadband Near-Infrared Phosphors via State Population Optimization
SP  - 2300310
DO  - 10.1002/adom.202300310
ER  - 

@article{
author = "Zhang, Qiuhong and Wei, Xiang and Zhou, Jianbang and Milićević, Bojana R. and Lin, Litian and Huo, Jiansheng and Li, Junhao and Ni, Haiyong and Xia, Zhiguo",
year = "2023",
abstract = "Technological progress has accelerated the researches into broadband near-infrared (NIR) luminescent materials as next-generation intelligent NIR light sources; however, poor thermal stability restricts the applications of NIR phosphors. Herein, new insights into Cr3+-activated NIR phosphors with improved thermal stability are provided. The photoluminescence intensity originating from the 4T2→4A2 broadband emission of CaLu2Al4SiO12:Cr3+ (CLAS:Cr) with optimal electron occupation (4T2/2E) increases up to 118% at 475 K compared with that at room temperature, which is the best for Cr3+-activated broadband NIR phosphor. Accordingly, new ideas for the design of thermally stable phosphors are proposed by optimizing the thermal population between 4T2 and 2E states and electron migration from 2E to 4T2 state. Finally, multifunctional applications of CLAS:Cr in NIR fluorescence intensity ratio thermometry, X-ray detection, NIR phosphor-converted light-emitting diodes, and bio-imaging are demonstrated.",
journal = "Advanced Optical Materials",
title = "Thermal Stability Improvement of Cr3+-Activated Broadband Near-Infrared Phosphors via State Population Optimization",
pages = "2300310",
doi = "10.1002/adom.202300310"
}

Zhang, Q., Wei, X., Zhou, J., Milićević, B. R., Lin, L., Huo, J., Li, J., Ni, H.,& Xia, Z.. (2023). Thermal Stability Improvement of Cr3+-Activated Broadband Near-Infrared Phosphors via State Population Optimization. in Advanced Optical Materials, 2300310.
https://doi.org/10.1002/adom.202300310

Zhang Q, Wei X, Zhou J, Milićević BR, Lin L, Huo J, Li J, Ni H, Xia Z. Thermal Stability Improvement of Cr3+-Activated Broadband Near-Infrared Phosphors via State Population Optimization. in Advanced Optical Materials. 2023;:2300310.
doi:10.1002/adom.202300310 .

Zhang, Qiuhong, Wei, Xiang, Zhou, Jianbang, Milićević, Bojana R., Lin, Litian, Huo, Jiansheng, Li, Junhao, Ni, Haiyong, Xia, Zhiguo, "Thermal Stability Improvement of Cr3+-Activated Broadband Near-Infrared Phosphors via State Population Optimization" in Advanced Optical Materials (2023):2300310,
https://doi.org/10.1002/adom.202300310 . .

TY  - JOUR
AU  - Zhou, Jianbang
AU  - Liu, Feilong
AU  - Li, Junhao
AU  - Milićević, Bojana R.
AU  - Yan, Jing
AU  - Wu, Zhanchao
AU  - Wu, Mingmei
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9798
AB  - Mn4+-activated fluorides rank among the most significant red phosphors for white light emitting diodes (LEDs) with enhanced color rendition, while their poor moisture resistance hinders further application. Surface coating with a protective layer is general approach to improving moisture resistance. However, these methods usually suffer from complex post-processing and poor shell stability. Herein, the introduction of passivation ions (Nb5+) may suppress the hydrolysis of [MnF6]2–, which provides a facile approach to obtaining moisture-resistant fluoride phosphors. Compared to K2TiF6:5.0%Mn4+, the moisture resistance and luminescence intensity of K2Ti0.949Nb0.051F6.051:5.0%Mn4+ improved significantly following the addition of Nb5+. In addition, the combination of as-prepared K2Ti0.949Nb0.051F6.051:5.0%Mn4+ red phosphor, YAG:Ce yellow phosphor and blue-chip enables the production of warm white LEDs with excellent color rendition (Ra = 90.2), low correlated color temperature (CCT = 3816 K), and high luminous efficacy (132.2 lm/W). © 2021
T2  - Optical Materials
T1  - A facile self-passivation strategy for improving moisture-resistance of fluoride red phosphors without surface modification
VL  - 117
DO  - 10.1016/j.optmat.2021.111184
ER  - 

@article{
author = "Zhou, Jianbang and Liu, Feilong and Li, Junhao and Milićević, Bojana R. and Yan, Jing and Wu, Zhanchao and Wu, Mingmei",
year = "2021",
abstract = "Mn4+-activated fluorides rank among the most significant red phosphors for white light emitting diodes (LEDs) with enhanced color rendition, while their poor moisture resistance hinders further application. Surface coating with a protective layer is general approach to improving moisture resistance. However, these methods usually suffer from complex post-processing and poor shell stability. Herein, the introduction of passivation ions (Nb5+) may suppress the hydrolysis of [MnF6]2–, which provides a facile approach to obtaining moisture-resistant fluoride phosphors. Compared to K2TiF6:5.0%Mn4+, the moisture resistance and luminescence intensity of K2Ti0.949Nb0.051F6.051:5.0%Mn4+ improved significantly following the addition of Nb5+. In addition, the combination of as-prepared K2Ti0.949Nb0.051F6.051:5.0%Mn4+ red phosphor, YAG:Ce yellow phosphor and blue-chip enables the production of warm white LEDs with excellent color rendition (Ra = 90.2), low correlated color temperature (CCT = 3816 K), and high luminous efficacy (132.2 lm/W). © 2021",
journal = "Optical Materials",
title = "A facile self-passivation strategy for improving moisture-resistance of fluoride red phosphors without surface modification",
volume = "117",
doi = "10.1016/j.optmat.2021.111184"
}

Zhou, J., Liu, F., Li, J., Milićević, B. R., Yan, J., Wu, Z.,& Wu, M.. (2021). A facile self-passivation strategy for improving moisture-resistance of fluoride red phosphors without surface modification. in Optical Materials, 117.
https://doi.org/10.1016/j.optmat.2021.111184

Zhou J, Liu F, Li J, Milićević BR, Yan J, Wu Z, Wu M. A facile self-passivation strategy for improving moisture-resistance of fluoride red phosphors without surface modification. in Optical Materials. 2021;117.
doi:10.1016/j.optmat.2021.111184 .

Zhou, Jianbang, Liu, Feilong, Li, Junhao, Milićević, Bojana R., Yan, Jing, Wu, Zhanchao, Wu, Mingmei, "A facile self-passivation strategy for improving moisture-resistance of fluoride red phosphors without surface modification" in Optical Materials, 117 (2021),
https://doi.org/10.1016/j.optmat.2021.111184 . .