Tunable dual-emission of Sb 3+ , Ho 3+ Co-doped Cs 2 NaScCl 6 single crystals for light-emitting diodes

作者：Qingyong Qin, Yu Liu, Ge Gao, Zhaoqiong Chen, Zejiang Gao, Li Chen, Xian-Ci Zhong, Bingsuo Zou · 发表于：Nanotechnology · 年份：2023 · DOI：10.1088/1361-6528/ad14b2 · 被引用次数：15 · 研究领域：Perovskite Materials and Applications、Solid-state spectroscopy and crystallography、Optical properties and cooling technologies in crystalline materials

Abstract Lead-free halide double perovskites are considered as one of the most promising materials in optoelectronic devices, such as solar cells, photodetectors, and light-emitting diodes (LEDs), due to their environmental friendliness and chemical stability. However, the extremely low photoluminescence quantum yield (PLQY) of self-trapped excitons (STEs) emission from lead-free halide double perovskites impedes their applications. Herein, Sb 3+ ions were doped into rare-earth-based double perovskite Cs 2 NaScCl 6 single crystals (SCs), resulting in a large enhancement of PLQY from 12.57% to 87.37%. Moreover, by co-doping Sb 3+ and Ho 3+ into Cs 2 NaScCl 6 SCs, the emission color can be tuned from blue to red, due to an efficient energy transfer from STEs to Ho 3+ ions. Finally, the synthesized sample was used in multicolor LED, which exhibited excellent stability and optical properties. This work not only provides a new strategy for improving the optical properties of Cs 2 NaScCl 6 SCs, but also suggests its potential application in multicolor LEDs.