All‐inorganic bismuth‐halide perovskites are promising alternatives for lead halide perovskites due to their admirable chemical stability and optoelectronic properties; however, these materials deliver inferior photoluminescence (PL) properties, severely hindering their prospects in lighting applications. Here, a novel air‐stable but non‐emissive perovskite Rb3BiCl6 is synthesized, and the material is used as a prototype to uncover origin of the poor optical performance in bismuth‐halide perovskite. It is found that the extremely strong exciton–phonon interactions with a large coupling constant up to 693 meV leads to the seriously nonradiative recombination, which, however, can be effectively suppressed to 347 meV by introducing Sb3+ ions. As a result, Sb3+‐doped Rb3BiCl6 exhibits a stable yellow emission with unprecedented PL quantum yield up to 33.6% from self‐trapped excitons. Systematic spectroscopic characterizations and theoretical calculations are carried out to unveil the intriguing photophysical mechanisms. This work reveals the effect of exciton–phonon interaction, that is often underemphasized, on a material's photophysical properties.
Reducing overpotential and increasing reaction rate, which are respectively determined by thermodynamics and kinetics of electrocatalysis, are the key to high performance bifunctional electrocatalysts for OER/ORR. Herein, six late-transition metals...
The novel NH4+-doped MA1-x(NH4)xPbBr3 perovskite quantum dots were synthesized at room temperature. The introduction of NH4+ results in larger lattice formation energy and better crystallinity for MA1-x(NH4)xPbBr3, which greatly reduces...
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