The emergence of lead halide perovskites for optical and electronic applications has been one of the most important discoveries of materials science and chemistry of the past two decades. To accelerate the industrial use of metal halide perovskites, there is a global search for alternative non-toxic lead-free halides that demonstrate higher environmental stability and similarly outstanding optoelectronic properties while preserving the advantageous properties of lead halides. In this talk, our recent discoveries of brand-new families of lead-free high efficiency light-emitting materials will be summarized. These include all-inorganic copper(I) halides demonstrate low-dimensional non-perovskite structures, and consequently, very flat bands around the band gap, leading to very localized charges. Such charge localization and low-dimensional structures typically result in the presence of high stability self-trapped excitons at room temperature producing record high photoluminescence efficiencies approaching unity. Our findings on all-inorganic copper halides will be compared to the light emission properties of low-dimensional hybrid organic-inorganic halides. The talk will be concluded with a few examples of the potential practical applications of the luminescent metal halides mentioned in this talk.

High-efficiency light emission from all-inorganic copper halides

ACS Spring Meeting 2021

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