DataVXAdvanced Optical MaterialsPaper
journal article·2023-07

Thermal Stability Improvement of Cr3+‐Activated Broadband Near‐Infrared Phosphors via State Population Optimization

Qiuhong Zhang, Xiang Wei, Jianbang Zhou, Bojana Milićević, Litian Lin, Jiansheng Huo, Junhao Li, Haiyong Ni, Zhiguo Xia

Advanced Optical Materials· Volume 11· Issue 14
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Source abstract

Abstract

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.
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Research context

OpenAlex topics: Luminescence Properties of Advanced Materials · Perovskite Materials and Applications · Advanced Photocatalysis Techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Rare Metals Separation and Comprehensive Utilization Guangdong Province Key Laboratory of Rare Earth Development and Application Institute of Resources Utilization and Rare Earth Development Guangdong Academy of Sciences Guangzhou 510651 P. R. China

School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China

Centre of Excellence for Photoconversion Vinča Insitute of Nuclear Sciences – National Institute of the Republic of Serbia University of Belgrade P.O. Box 522 Belgrade 11001 Serbia

The State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques School of Physics and Optoelectronics South China University of Technology Guangzhou 510641 P. R. China

Funding

National Natural Science Foundation of China

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