Lead-free Cesium Europium Halide Perovskite Nanocrystals
Jianmei Huang, Lei Teng, Martin Siron, Ye Zhang, Sunmoon Yu, F. Seeler, Ahmad Dehestani, Li Na Quan, Kerstin Schierle‐Arndt, Peidong Yang
Abstract
Because of the toxicity of lead, searching for a lead-free halide perovskite semiconducting material with comparable optical and electronic properties is of great interest. Rare-earth-based halide perovskite represents a promising class of materials for this purpose. In this work, we demonstrate the solution-phase synthesis of single-crystalline CsEuCl3 nanocrystals with a uniform size distribution centered around 15 nm. The CsEuCl3 nanocrystals have photoluminescence emission centered at 435 nm, with a full width at half-maximum of 19 nm. Furthermore, CsEuCl3 nanocrystals can be embedded in a polymer matrix that provides enhanced stability under continuous laser irradiation. Lead-free rare-earth cesium europium halide perovskite nanocrystals represent a promising candidate to replace lead halide perovskites.