DOI: https://doi.org/10.29363/nanoge.hpatom.2022.016
Publication date: 30th October 2021
Artificial lighting accounts for nearly 20% of global electricity consumption; therefore, a more efficient light-emitting material can substantially reduce energy usage for developed and developing countries. Indoor illumination requires high-quality broadband white-light emitting sources, where a single-material white-light emitting source would be ideal to avoid colour instability and self-absorption issues associated with the multiple emitters. Since 2014, layered lead-based halide perovskites have demonstrated an attractive single-material white-light emission upon UV-light excitation. Unfortunately, lead-containing perovskite candidates face challenges due to long-term chemical instability, recycling and risks associated with Pb2+ toxicity. Recently, lead-free halide double perovskites, A2B'B"X6, which exhibit higher ambient stability and low-toxicity, have been demonstrated as broadband white-light emission sources. Here, we will talk about Bi/In (B'-site) mixed cationic double perovskites, namely, Cs2Bi1−xInxAgCl6 that exhibit attractive single-material white-light emission upon UV-light excitation. These materials exhibit an indirect to direct bandgap transition when x > 0.5 and the photoluminescence quantum yield (PLQY) is related to the Bi/In compositional ratio. Using solid-state NMR spectroscopy of multiple NMR-active quadrupolar nuclei (115In, 133Cs, 209Bi), we will show how their light-emission properties are linked to the local chemical structure. In addition to their local structure, the average long-range structure and formation of the solid solution are understood using conventional powder X-ray diffraction and theoretical calculations.
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