Composite Perovskites of Cesium Lead Bromide for Optimized Photoluminescence.

Title Composite Perovskites of Cesium Lead Bromide for Optimized Photoluminescence.
Authors Y. Ling; L. Tan; X. Wang; Y. Zhou; Y. Xin; B. Ma; K. Hanson; H. Gao
Journal J Phys Chem Lett
DOI 10.1021/acs.jpclett.7b01302
Abstract

The halide perovskite CsPbBr3 has shown its promise for green light-emitting diodes. The optimal conditions of photoluminescence and the underlying photophysics, however, remain controversial. To address the inconsistency seen in the previous reports and to offer high-quality luminescent materials that can be readily integrated into functional devices with layered architecture, we created thin films of CsPbBr3/Cs4PbBr6 composites based on a dual-source vapor-deposition method. With the capability of tuning the material composition in a broad range, CsPbBr3 is identified as the only light emitter in the composites. Interestingly, the presence of the photoluminescence-inactive Cs4PbBr6 can significantly enhance the light emitting efficiency of the composites. The unique negative thermal quenching observed near the liquid nitrogen temperature indicates that a type of shallow state generated at the CsPbBr3/Cs4PbBr6 interfaces is responsible for the enhancement of photoluminescence.

Citation Y. Ling; L. Tan; X. Wang; Y. Zhou; Y. Xin; B. Ma; K. Hanson; H. Gao.Composite Perovskites of Cesium Lead Bromide for Optimized Photoluminescence.. J Phys Chem Lett. 2017;8(14):32663271. doi:10.1021/acs.jpclett.7b01302

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Cesium

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Lead

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