Scale Synthesis of Environment Friendly CIZS/ZnS Core/Shell Quantum Dots for High Color Quality White LEDs

Abstract

Environment-friendly CuInZnS (CIZS) core and CuInZnS/ZnS (CIZS/ZnS) core/shell quantum dots (QDs) were synthesized via a facile solution-phase method. Different methods certified that the ZnS shell was successfully coated on CIZS core. The coating of ZnS shell would lead to the quantum yield increase and optical spectra blue shifted. Furthermore, the CIZS and CIZS/ZnS had a long PL lifetime of 257.3[Formula: see text]ns and 411.6[Formula: see text]ns, respectively. Finally, the CIZS/ZnS QDs powder with yellow emission was used to compose white light emitting diodes (WLED) on blue LED chip. The WLED had a [Formula: see text] of 80, [Formula: see text] of 4793[Formula: see text]K, and CIE coordinates of (0.346, 0.321) under 20[Formula: see text]mA current, and had a bright warm white emission, which indicated the promising potential of the CIZS/ZnS QDs in the optoelectronics.