Journal
ADVANCED OPTICAL MATERIALS
Volume 10, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202101765
Keywords
DFT calculations; luminescence enhancement; modification of halide perovskites; thermal stability; white light-emitting diodes
Categories
Funding
- National Natural Science Foundation of China [21871079, 11774128]
- Natural Science Foundation of Shandong Province [ZR2018JL003, 2019KJJ003]
- National Science Foundation [1945558]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1945558] Funding Source: National Science Foundation
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This study simultaneously prepared three-color lead halide perovskite phosphors with higher stability and luminous intensity, and successfully applied them in WLEDs, achieving superior color quality and ideal correlated color temperature.
The all-inorganic metal halide perovskite CsPbX3 (X = Cl, Br, and I) has received extensive attention in the field of white light-emitting diodes (WLEDs) due to its high luminous intensity and high color purity. However, the shortcoming of poor stability directly affects the luminous performance of the WLED devices and reduces their luminous efficiency, which has become an urgent problem to be solved. Here, three-color lead halide perovskite phosphors (blue-emitting CsPbBr3 synthesized at 20 degrees C (CPB-20), green-emitting CsPbBr3-80 (CPB-80)/CsPbBr3:SCN-(CPB:SCN-), and red-emitting PEA(2)PbBr(4) (PPB)/PEA(2)PbBr(4):Mn2+ (PPB:Mn2+)) with higher stability and luminous intensity are simultaneously prepared and applied in WLEDs. Density functional theory is used to optimize the structures of CsPbBr3 and PEA(2)PbBr(4), and to calculate the work function, optical properties, and charge density difference. Not only the WLED devices with three-color lead halide perovskite phosphors are constructed, but also WLED devices from warm white to cold white are realized by tuning the ratio of the different emissions, and a superior color quality (color rendering index of 96) and ideal correlated color temperature (CCT of 9376 K) are achieved. This work will set the stage for exploring low-cost, environmentally friendly, high-performance WLEDs.
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