Hybrid Metal Halides with Multiple Photoluminescence Centers.

Abstract

Very little is known about the realm of solid-state metal halide compounds comprising two or more halometalate anions. Such compounds would be of great interest if their optical and electronic properties could be rationally designed. Herein, we report a new example of metal halide cluster-assembled compound (C9 NH20 )9 [Pb3 Br11 ](MnBr4 )2 , featuring distinctly different anionic polyhedra, namely, a rare lead halide cluster [Pb3 Br11 ]5- and [MnBr4 ]2- . In accordance with its multinary zero-dimensional (0D) structure, this compound is found to contain two distinct emission centers, 565 nm and 528 nm, resulting from the formation of self-trapped excitons and 4 T1 -6 A1 transition of Mn2+ ions, respectively. Based on the high durability of (C9 NH20 )9 [Pb3 Br11 ](MnBr4 )2 upon light and heat, as well as high photoluminescence quantum yield (PLQY) of 49.8 % under 450 nm blue light excitation, white light-emitting diodes (WLEDs) are fabricated, showcasing its potential in backlight application.