激子
光致发光
钙钛矿(结构)
掺杂剂
猝灭(荧光)
光谱学
量子产额
卤化物
结晶学
Atom(片上系统)
材料科学
化学
原子物理学
发射光谱
分析化学(期刊)
无机化学
兴奋剂
荧光
凝聚态物理
物理
光电子学
光学
谱线
天文
嵌入式系统
量子力学
色谱法
计算机科学
作者
Binbin Luo,Yan Guo,Xianli Li,Yonghong Xiao,Xiao‐Chun Huang,Jin Z. Zhang
标识
DOI:10.1021/acs.jpcc.9b02649
摘要
In this work, Mn2+ has been efficiently and homogeneously doped into two-dimensional (2D) distorted single-layered EA2PbBr4 (EA: ethylammonium) via a reprecipitation method. Both the doped and undoped 2D layered lead halide perovskites (LHPs) were characterized using a combination of X-ray, electron microscopy, and spectroscopy techniques. The Mn2+-doped EA2PbBr4 (EA2PbBr4:Mn2+) shows a 78% photoluminescence (PL) quantum yield (QY) with complete quenching of self-trapped exciton emission because of efficient exciton trapping by defects created by dopants and small activation energy (∼9.8 meV) between the defect states and Mn2+ d states. Compared to the long lifetime (∼1.5 ms) of Mn2+ emission in CsPbCl3, the lifetime in 2D EA2PbBr4 is found to be ∼0.75 ms, resulting from the heavy atom effect. Additionally, the PL QY of Mn2+ emission can be further increased by codoping Zn2+ or Cd2+, which is attributed to a high density of trap states created by codoping, facilitating exciton to Mn2+ energy transfer. These results reveal the key role of trap states in the energy transfer of Mn2+-doped 2D LHPs.
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