Optimizing Broadband Emission in 2D Halide Perovskites

Broadband and white-light emitting materials are sought after for applications such as phosphors and LEDs. Some twodimensional (2D) halide perovskites are promising candidates in this efficiency (PLQY) is highly challenging. Herein, we show a new strategy for optimizing the efficiency of the broadband emission of 2D halide perovskites. Specifically, we show that by a combination of halide bonds and halide mixing, the PLQYs of a novel family of materials with the formula (Br-PEA)2PbBrxCl4-x (Br-PEA = 4-bromo phenethylammonium) can be improved by one order of magnitude, from 3 to 25%; this approach could be useful to many other 2D perovskites.

Automated summary

This study demonstrates a new strategy for optimizing the efficiency of the broadband emission of 2D halide perovskites by combining halide bonds and halide mixing, leading to a significant improvement in the photoluminescence quantum yields of a novel family of materials.