Abstract
Cu+-doped metal halide Cs2ZnI4 phosphor powders were synthesized by a facile solid-state synthesis method. The introduction of Cu+ makes the weakly luminous Cs2ZnI4 emit stronger blue light around 450 nm. When the doping concentration is 5 %, the photoluminescence quantum yield (PLQY) is up to 17.76 %. This work provides a feasible strategy for the preparation of metal halide phosphors applied to blue-light-excitable LED devices, and also gives an insight into understanding self-trapped excitons (STEs) emission in zero-dimensional metal halides.
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