Water-induced crystal phase transformation of stable lead-free Cu-based perovskite nanocrystals prepared by one-pot method

光致发光 钙钛矿(结构) 发光 纳米晶 材料科学 显色指数 激子 发光二极管 相(物质) 光电子学 光化学 化学 纳米技术 结晶学 物理 量子力学 有机化学
作者
Liu Shuaidong,Hongli Liu,Guofu Zhou,Xianggao Li,Shirong Wang
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:427: 131430-131430 被引量:30
标识
DOI:10.1016/j.cej.2021.131430
摘要

Cu-based perovskite Nanocrystals (NCs) have a bright future in the field of optoelectronics due to their low toxicity, remarkable optical properties and good environmental stability. However, the industrial application is hindered by complex preparation methods. Herein, a facile one-pot method for synthesizing Cs3Cu2X5 NCs is proposed. The target Cu-based perovskite NCs were qualified with preferable optical performance, including near-unity PLQY (X = Cl and I), adjustable spectrum from 441 to 556 nm and remarkable environmental stability (retained more than 50% Photoluminescence (PL) intensity for 2 months in air). Density functional theory (DFT) calculations, Time-resolved PL (TRPL) and temperature-dependent PL spectrum were implemented to explore the Self-trapped excitons (STEs) luminescence mechanism and the roots for remarkable optical performance. In addition, crystal phase transformation was observed in water post-treatment from blue light-emitting Cs3Cu2I5 NCs to yellow light-emitting CsCu2I3 NCs, relative characterizations were implemented and a plausible reaction mechanism was proposed. Resultantly, a White light-emitting diode (W-LED) constructed by mixing these two phases was endowed with pure white light, which possessed the Commission Internationale de L'Eclairage (CIE) coordinate of (0.32, 0.34), color temperature of 6053 K, color Rendering index (Ra) 0f 91 and maximum luminance of 1558 cd/m2. The contribution indicates that Cu-based perovskite NCs prepared by one-pot method have great potential for luminescent applications.
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