光致发光
发光
兴奋剂
掺杂剂
激子
分析化学(期刊)
材料科学
纳米晶
钙钛矿(结构)
光谱学
凝聚态物理
结晶学
纳米技术
化学
物理
光电子学
量子力学
色谱法
作者
Xi Yuan,Sihang Ji,Michael C. De Siena,Liling Fei,Zhao Zhao,Yunjun Wang,Haibo Li,Jialong Zhao,Daniel R. Gamelin
标识
DOI:10.1021/acs.chemmater.7b03311
摘要
A series of Mn2+-doped CsPbCl3 nanocrystals (NCs) was synthesized using reaction temperature and precursor concentration to tune Mn2+ concentrations up to 14%, and then studied using variable-temperature photoluminescence (PL) spectroscopy. All doped NCs show Mn2+ 4T1g → 6A1g d–d luminescence within the optical gap coexisting with excitonic luminescence at the NC absorption edge. Room-temperature Mn2+ PL quantum yields increase with increased doping, reaching ∼60% at ∼3 ± 1% Mn2+ before decreasing at higher concentrations. The low-doping regime is characterized by single-exponential PL decay with a concentration-independent lifetime of 1.8 ms, reflecting efficient luminescence of isolated Mn2+. At elevated doping, the decay is shorter, multiexponential, and concentration-dependent, reflecting the introduction of Mn2+–Mn2+ dimers and energy migration to traps. A large, anomalous decrease in Mn2+ PL intensity is observed with decreasing temperature, stemming from the strongly temperature-dependent exciton lifetime and slow exciton-to-Mn2+ energy transfer, which combine to give a strongly temperature-dependent branching ratio for Mn2+ sensitization.
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