兴奋剂
材料科学
光降解
发光
纳米晶
钝化
钙钛矿(结构)
激子
离子
光化学
光致发光
光电子学
紫外线
紫外线
分析化学(期刊)
纳米技术
化学
结晶学
催化作用
光催化
量子力学
生物化学
物理
有机化学
色谱法
图层(电子)
作者
Qiuyan Li,Sihang Ji,Xianglin Yuan,Ji Li,Fan Yi,Jiahua Zhang,Jialong Zhao,Haibo Li
标识
DOI:10.1021/acs.jpcc.9b03294
摘要
Improving the photostability of highly luminescent Mn2+ doped all-inorganic halide perovskite nanocrystals (NCs) is challenging because their excellent optical performances are determined by the stable structure and low defect/trap states. The optical properties of Mn2+ doped CsPbCl3 (Mn2+:CsPbCl3) NCs with various Mn2+ doping concentrations under ultraviolet (UV) illumination were studied to unravel their photodegradation by using photoluminescence (PL) spectroscopy at room temperature. The PL intensities of band-edge excitons and Mn2+ ions in the Mn2+:CsPbCl3 NC films significantly decreased due to formation of nonradiative defects/traps in NCs with increasing illumination times. It was surprisingly found that the single- and multiexponential decay times (1.81–1.15 ms) of Mn2+ emissions ranging from 595 to 640 nm observed in the doped NC films with low and high Mn/Pb ratios were almost not varied with increasing UV illumination times. However, the blue-shift of Mn2+ emission was observed in high Mn2+ doping concentration NCs under illumination, which might result from the diffusion of Mn2+ ions to the surface of doped NCs. Further, the surface passivation of Mn2+:CsPbCl3 NCs by using a Cs4PbCl6 shell was found to effectively suppress the photodegradation of Mn2+:CsPbCl3 NCs and enhance the PL stability of Mn2+.
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