All‐Inorganic Lead‐Free 0D Perovskites by a Doping Strategy to Achieve a PLQY Boost from <2 % to 90 %
Peigeng Han, Cheng Luo, Songqiu Yang, Yang Yang, Wei Deng, Keli Han
Abstract
Abstract Zero‐dimensional (0D) lead‐free perovskites have unique structures and optoelectronic properties. Undoped and Sb‐doped all inorganic, lead‐free, 0D perovskite single crystals A 2 InCl 5 (H 2 O) (A=Rb, Cs) are presented that exhibit greatly enhanced yellow emission. To study the effect of coordination H 2 O, Sb‐doped A 3 InCl 6 (A=Rb, Cs) are also synthesized and further studied. The photoluminescence (PL) color changes from yellow to green emission. Interestingly, the photoluminescence quantum yield (PLQY) realizes a great boost from <2 % to 85–95 % through doping Sb 3+ . We further explore the effect of Sb 3+ dopants and the origin of bright emission by ultrafast transient absorption techniques. Furthermore, Sb‐doped 0D rubidium indium chloride perovskites show excellent stability. These findings not only provide a way to design a set of new high‐performance 0D lead‐free perovskites, but also reveal the relationship between structure and PL properties.