光致发光
钙钛矿(结构)
材料科学
四方晶系
量子点
发光二极管
发光
激子
纳米晶
量子效率
光电子学
结晶学
晶体结构
纳米技术
化学
凝聚态物理
物理
作者
Huiwen Liu,Zhennan Wu,Jieren Shao,Dong Yao,Hang Gao,Yi Liu,Weili Yu,Hao Zhang,Bai Yang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2017-02-01
卷期号:11 (2): 2239-2247
被引量:515
标识
DOI:10.1021/acsnano.6b08747
摘要
CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) are potential emitting materials for illumination and display applications, but toxic Pb is not environment- and user-friendly. In this work, we demonstrate the partial replacement of Pb with Mn through phosphine-free hot-injection preparation of CsPbxMn1-xCl3 QDs in colloidal solution. The Mn substitution ratio is up to 46%, and the as-prepared QDs maintain the tetragonal crystalline structure of the CsPbCl3 host. Meaningfully, Mn substitution greatly enhances the photoluminescence quantum yields of CsPbCl3 from 5 to 54%. The enhanced emission is attributed to the energy transfer of photoinduced excitons from the CsPbCl3 host to the doped Mn, which facilitates exciton recombination via a radiative pathway. The intensity and position of this Mn-related emission are also tunable by altering the experimental parameters, such as reaction temperature and the Pb-to-Mn feed ratio. A light-emitting diode (LED) prototype is further fabricated by employing the as-prepared CsPbxMn1-xCl3 QDs as color conversion materials on a commercially available 365 nm GaN LED chip.
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