DataVXAdvanced Optical MaterialsPaper
journal article·2020-03Open access

Single‐Crystal Red Phosphors: Enhanced Optical Efficiency and Improved Chemical Stability for wLEDs

Zhengliang Wang, Zhiyu Yang, Nan Wang, Qiang Zhou, Jianbang Zhou, Li Ma, Xiaojun Wang, Yiqing Xu, Mikhail G. Brik, Miroslav D. Dramićanin, Mingmei Wu

Advanced Optical Materials· Volume 8· Issue 6
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Source abstract

Abstract

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.
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Research context

OpenAlex topics: Luminescence Properties of Advanced Materials · Perovskite Materials and Applications · Radiation Detection and Scintillator Technologies

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

Affiliations

Key Laboratory of Green Chemistry Materials in University of Yunnan Province National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials School of Chemistry and Environment Yunnan Minzu University Kunming 650500 P. R. China

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry School of Chemistry Sun Yat‐Sen University Guangzhou 510275 P. R. China

Department of Physics Georgia Southern University Statesboro Georgia 30460 USA

Guangdong Institute of Semiconductor Industrial Technology Guangzhou 510650 P. R. China

Institute of Physics University of Tartu W. Ostwald Str. 1 Tartu 50411 Estonia

Viňa Institute of Nuclear Sciences University of Belgrade P.O. Box 522 Belgrade 11001 Serbia

Funding

National Natural Science Foundation of China · Natural Science Foundation of Yunnan Province · Natural Science Foundation of Guangdong Province

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