Abstract
Cs2AgInCl6 with broadband emission has become a promising substitute for lead halide perovskite due to its unique properties. In this study, a spraying and evaporating method is developed to prepare lead-free double perovskite Cs2Ag1-xLixInCl6:Bi, involving Li+ and Bi3+ codoping, with improved photoluminescence quantum yield (PLQY) of the perovskites. The experimental results show that the PLQY of Cs2AgInCl6 increases from <1% to 36% with Li+ doping and finally reaches 76% through further Bi3+ doping. In particular, Cs2Ag0.7Li0.3InCl6:Bi yields the highest PLQY and significant stability under ultraviolet irradiation. In optoelectronic applications, white light-emitting devices are manufactured based on Cs2Ag0.7Li0.3InCl6:Bi crystals, which act as solid phosphors, and achieve excellent performance, such as Commission International de I'Eclairage color coordinates of (0.37, 0.37), a high color rendering index of 84.1, and a correlation color temperature of 4331 K. Therefore, double perovskites may find potential application in the field of light-emitting and display optoelectronic devices.
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