胶体量子点单颗粒的荧光闪烁:化学动力学过程?光物理动力学过程?
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- 英文论文题名：Photoluminescence Blinking of Single Colloidal Quantum Dots:Chemical Kinetics or Photophysical Dynamics?
- 论文作者：秦海燕 ; 孟任阳 ; 牛原 ; 彭笑刚
- 英文论文作者：Haiyan Qin ; Renyang Meng ; Yuan Niu ; Xiaogang Peng ; Center for Chemistry of Novel & High-Performance Materials ; and Department of Chemistry ; Zhejiang University
- 年：2016
- 作者机构：浙江大学高新材料化学中心浙江大学化学系;
- 论文关键词：胶体量子点单颗粒 ; 荧光闪烁 ; 化学动力学 ; 光物理动力学
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十五分会：纳米表征与测量
- 语种：中文
- 分类号：O648.1;TQ422
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十五分会 ; 纳米表征与测量
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：142k
- 原文格式：D
- 会议级别：全国
摘要
胶体半导体纳米晶,即量子点,是一种具有吸收带宽、发射光谱窄且可调、荧光量子产率高等众多优异光学性质的新型荧光材料。量子点单颗粒的荧光闪烁,是指在持续的光激发下,量子点的荧光在不同强度水平间随机切换的现象。尽管经过二十年的研究,量子点荧光闪烁的机理仍不清楚。在文献中,人们一般把量子点荧光闪烁中的带点和去电荷过程处理为光物理动力学过程。本报告将从一个全新的视角——化学动力学与光物理动力学相结合的角度——去分析量子点带电和去电荷过程,并尝试揭示荧光闪烁的机理。我们选择具有不同壳层厚度的一系列闪锌矿型CdSe/CdS核壳量子点作为研究模型。这些量子点样品具有高荧光量子产率、荧光单通道衰减、以及在单激子条件下非闪烁的理想的光谱学性质~(1,2)。通过系统和定量的实验测量和分析,量子点荧光闪烁中带电和去电荷过程的各个通道均被指认出来~3。
Colloidal semiconductor nanocrystals, also known as quantum dots(QDs), are novel fluorophore exhibiting many unique optical properties such as broad absorption band, tunable and narrow emission spectra, high photoluminescence quantum yield and so on. Photoluminescence blinking of single QDs, with emission switching between different brightness levels under constant excitation, has been studied intensively for decades but its mechanism is still unknown. In literature, QD blinking are generally treated as photophysical dynamic processes. In this presentation, we will introduce a new analysis method combining chemical kinetics and photophysical dynamics to study the charging and discharging processes and attempt to uncover the mechanism behind. A series of high quality zinc-blende Cd Se/Cd S core/shell QDs are selected as a study model. Different channels in blinking of single QDs are resolved by systematic and quantitative measurements.
Colloidal semiconductor nanocrystals, also known as quantum dots(QDs), are novel fluorophore exhibiting many unique optical properties such as broad absorption band, tunable and narrow emission spectra, high photoluminescence quantum yield and so on. Photoluminescence blinking of single QDs, with emission switching between different brightness levels under constant excitation, has been studied intensively for decades but its mechanism is still unknown. In literature, QD blinking are generally treated as photophysical dynamic processes. In this presentation, we will introduce a new analysis method combining chemical kinetics and photophysical dynamics to study the charging and discharging processes and attempt to uncover the mechanism behind. A series of high quality zinc-blende Cd Se/Cd S core/shell QDs are selected as a study model. Different channels in blinking of single QDs are resolved by systematic and quantitative measurements.
引文
[1]Qin,H.*;Niu,Y.;Meng,R.;Lin,X.;Lai,R.;Fang,W.*;Peng,X.*J.Am.Chem.Soc.2014,136,179.
[2]Nan,W.;Niu,Y.;Qin,H.*;Cui,F.;Yang,Y.;Lai,R.;Lin,W.;Peng,X.*J.Am.Chem.Soc.2012,134,19685.
[3]Meng R.;Qin,H.*;Niu,Y.;Fang,W.;Yang,S.;Lin,X.;Cao,H.;Lin,W.;Tong,L.;Peng,X.*Submitted.
[2]Nan,W.;Niu,Y.;Qin,H.*;Cui,F.;Yang,Y.;Lai,R.;Lin,W.;Peng,X.*J.Am.Chem.Soc.2012,134,19685.
[3]Meng R.;Qin,H.*;Niu,Y.;Fang,W.;Yang,S.;Lin,X.;Cao,H.;Lin,W.;Tong,L.;Peng,X.*Submitted.