光致发光
材料科学
四方晶系
纳米晶
结晶
亚稳态
聚苯乙烯
光电子学
相(物质)
量子产额
纳米技术
化学工程
聚合物
光学
化学
工程类
复合材料
量子力学
物理
有机化学
荧光
作者
Dejian Chen,Decai Huang,Mingwei Yang,Kunyuan Xu,Jie Hu,Feixiang Xu,Sisi Liang,Haomiao Zhu
标识
DOI:10.1002/adom.202101869
摘要
Abstract Phase engineering of CsPbI 3 nanocrystals (NCs) is a priority for their optoelectronic applications. So far, the scalable and room‐temperature direct synthesis of black phase CsPbI 3 NCs remains an enormous challenge because of the thermal unequilibrium‐induced phase transition. Herein the direct synthesis is reported of metastable β‐CsPbI 3 NCs in gram‐scale at room‐temperature in seconds via spontaneous crystallization. The obtained β‐CsPbI 3 NCs exhibit good monodispersity, narrow‐band far‐red emission (716 nm, FWHM = 38 nm) as well as a high photoluminescence quantum yield of 62%. The crystallization dynamics of β‐CsPbI 3 NCs are revealed through in situ UV–vis absorption and photoluminescence spectra analysis. Finally, a photon‐to‐photon conversion indirect X‐ray detector based on the phase‐stable NCs/polystyrene film is preliminarily demonstrated. This scalable and low‐cost preparation of high‐quality metastable β‐CsPbI 3 NCs will pave the way for their future commercial applications in novel optoelectronic devices.
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