Journal
ADVANCED OPTICAL MATERIALS
Volume 8, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201901512
Keywords
enhanced optical efficiency; improved chemical stability; light-emitting diodes; photoluminescence; single-crystal phosphors
Categories
Funding
- National Natural Science Foundation of China [U1702254, 21661033, U1301242]
- Natural Science Foundation of Yunnan Province [2017FB017]
- Program for Innovative Research Team (in Science and Technology) in University of Yunnan Province
- Guangdong Province [U1301242]
- Special Fund of Guangdong Province Project for Applied Science and Technology Research and Development [2017B090917001]
- Science and Technology Planning Project of Guangzhou City [201704030020]
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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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