CsPbBr 3 and Cs 4 PbBr 6 perovskite light-emitting diodes using a thermally evaporated host-dopant system.

This article shows the results of fabricating a device through vacuum deposition by synthesizing a perovskite thin film in the powder form. Light emitting diodes (LEDs) were fabricated using a single-source and host-dopant system of the perovskite produced in the powder form. Both CsPbBr 3 and Cs 4 PbBr 6 used in the host-dopant system were green, and the host was tris(8-quinolinolato) aluminum(III). It is confirmed that the display efficiency and optical characteristics are significantly improved by the dopant ratio. The 3%-doped CsPbBr 3 based LED shows a luminance of 9083 cd m -2 , 3.36% external quantum efficiency (EQE), and 96% photoluminescence quantum yield (PLQY) efficiency (for the undoped CsPbBr 3 LED, luminance: 844 cd m -2 /EQE: 1.93%/PLQY: 85%). The LED based on 5%-doped Cs 4 PbBr 6 shows a luminance of 11 440 cd m -2 , an EQE of 6.27%, and 99% PLQY efficiency (for the undoped Cs 4 PbBr 6 LED, luminance:1113 cd m -2 /EQE: 1.64%/PLQY: 93%). It is expected that the results of this research will contribute to the perovskite LED research performed by thermal evaporation in the future.