光致发光
碲化镉光电
激子
激发态
放松(心理学)
纳米晶
材料科学
大气温度范围
光谱学
重组
人口
分子物理学
化学物理
凝聚态物理
化学
原子物理学
光电子学
物理
纳米技术
气象学
人口学
社会学
基因
社会心理学
量子力学
生物化学
心理学
作者
Yoshiyuki Nonoguchi,Takuya Nakashima,Tsuyoshi Kawai
摘要
Exciton recombination dynamics of zinc-blende CdTe nanocrystals (NCs) have been investigated by using an ionic liquid as a cryogenic matrix. Size and temperature dependence of photoluminescence lifetimes of CdTe NCs were studied by time-resolved spectroscopy. The photoluminescence properties in a low-temperature range were characterized by a simple three-level model where populations of two emitting states in CdTe NCs are determined by Boltzmann distribution. Observation at low temperature suggests that the relaxation pathway is dependent on the population between two kinds of excited states of the CdTe NC generated by an electron−hole exchange interaction in the tightly confined particle-in-a-box system.
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