Fine‐Tuning Single‐Source White‐Light Emission from All‐Inorganic Corrugated 2D Antimony‐Halide Perovskite (Advanced Optical Materials 17/2022)

Xu, Fei; Xiang, Wang; Li, Yue; Jiang, Beng; Dong, Zuoru; Yang, Zhonghua; Kang, Jiaxing; Shu, Xin; Jiang, Zuimin; Hong, Feng; Xu, R. X.; Ma, Zhongquan; Chen, Teng; Zhan, Xiaowei; Xu, Haitao

doi:10.1002/adom.202270069

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“…To resolve this issue, diverse metal halide perovskite structures have been proposed. First, Sn 2+ and Ge 2+ ions, from the same family as Pb 2+ , were used to replace Pb 2+ , , but the stability of such perovskites is extremely poor because Sn 2+ and Ge 2+ are easily oxidized. − Sb 3+ , Bi 3+ , In 3+ , and Te 4+ , which have a similar electron structure (ns 2 ) as Pb 2+ , have also been used to substitute the Pb 2+ ion. − Although these methods reduce the toxicity of lead-based halide perovskites to a certain extent, they do not fundamentally solve the stability and toxicity problems. Therefore, a novel piece of perovskite material with high efficiency, stability, and environmental safety is urgently needed.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Double Exciton Competition Emission in One Dimensional Copper-Based Organic–Inorganic Hybrid Perovskites

et al. 2023

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Organic−inorganic hybrid perovskites with temperature-dependent dual emission are attracting more attention due to their promising application in fluorescence intensity ratio technology. Herein, we report a Cu-based organic−inorganic hybrid perovskite (BDA)Cu 2 Br 4 (BDA = C 4 H 12 N 2 2+ ) with dimeric clusters ([Cu 2 Br 6 ] 4− ) and organic cations (BDA) periodically arranged in a one-dimensional structure. This structure enables lattice selftrapping and strong coupling between electrons and phonons. The difference in the degree of lattice distortion affected by the temperature decrease leads to the mutual competition between two different self-trapped excitons, thus causing the two self-trapped emissions, resulting in the emission changes from the blue light to the orange-red light. Furthermore, these change in emission color can reverse while the temperature increases. This property potentially enables applications in temperature sensing, blue LEDs, and solid-state lighting.

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