Tailored Synthesis of an Unprecedented Pb-Mn Heterometallic Halide Hybrid with Enhanced Emission.

Abstract

Organic-inorganic lead halide hybrids have attracted extensive interest in solid-state lighting, due to their superior color tunability and low-cost solution processing. However, the relatively low photoluminescence quantum efficiency (PLQE) is a common issue for most bulk lead halide hybrids. Inspired by the intriguing luminescence properties of heterometallic complexes, we rationally developed an unprecedented two dimensional Pb-Mn heterometallic halide hybrid, (C5H14N2)2Pb4MnCl14 (2), through a precisely tailored synthetic approach based on (C5H14N2)2Pb5Cl14 (1). Intriguingly, 2 features a unique two-dimensional heterometallic halide layer configuration, in which the strong quantum confinement facilitates efficient energy transfer from bound excitons to d-states of Mn2+, resulting in highly sensitized Mn2+emission. Emphatically, the PLQE of 2 is up to 32%, considerably higher than that of pristine 1 (less than 1%). Moreover, 2 presents prominent environmental and thermal stability, benefitting from its clusters feature. To our best knowledge, this is the first example to construct Pb-Mn heterometallic halide hybrid with bulk highly efficient red emission. This work paves a way to enhance the PLQE of lead halide hybrid via sensitization in rationally designed heterometallic halide hybrids.