Highly Stable Orange-Red Long-Persistent Luminescent CsCdCl :Mn Perovskite Crystal.

Halide perovskite has been widely studied as a new generation of photoelectronic materials. However, their thermal and humidity-induced emission quenching have greatly limited their utility and reliability. Here, we report a hexagonal Mn -doped CsCdCl perovskite crystal that possesses stable photoluminescence (PL) at both high temperature and humidity.