Extensive emission tuning and characterization of highly efficient CuInS2 quantum dots for white light-emitting diodes

Li Qinghua; Bai Jinke; Bu Cuiying; Cui Zimei; Huang Jiyan; Nie Xuerong; Jin Xiao; Xu Bing

doi:10.1364/OE.502064

Extensive emission tuning and characterization of highly efficient CuInS₂ quantum dots for white light-emitting diodes

Opt Express. 2023 Oct 23;31(22):36691-36701. doi: 10.1364/OE.502064.

Authors

Li Qinghua, Bai Jinke, Bu Cuiying, Cui Zimei, Huang Jiyan, Nie Xuerong, Jin Xiao, Xu Bing

PMID: 38017814
DOI: 10.1364/OE.502064

Abstract

Whole visible range emitting CuInS₂/ZnS QDs were obtained with broad band-width and high luminous efficiency by altering the Cu/In ratio and coating ZnS layer. 1-Dodecanethiol (DDT) as a sulfur source in the ZnS coating process can inhibit the lattice defects caused by Zn²⁺ inter-diffusion, thus increasing the photoluminescence quantum yield (PL QY). Then the stability and lighting performance of white light-emitting diodes (WLEDs) based on these CuInS₂/ZnS QDs were characterized. The optimized WLED device exhibited a moderate luminous efficacy (LE) (70.33 lm·W^-1) and ultrahigh color qualities (CRI Ra = 92.7, R9 = 95.9, R13 = 96.3) with warm white at a correlated color temperature (CCT) of 4052 K.