Temperature-dependent photoluminescence of ZnCuInS/ZnSe/ZnS quantum dots

	Temperature-dependent photoluminescence of ZnCuInS/ZnSe/ZnS quantum dots
	Liu W.; Zhang Y.; Zhai W.; Wang Y.; Zhang T.; Gu P.; Chu H.; Zhang H.; Cui T.; Zhao J.; Yu W. W.
	2013
发表期刊	Journal of Physical Chemistry C
ISSN	ISBN/19327447
卷号	117 期号:38
摘要	Colloidal ZnCuInS/ZnSe/ZnS core/shell/shell quantum dots (QDs) with average particle sizes of 2.3, 2.7, and 3.3 nm were prepared in a noncoordinating solvent. The size-dependent optical band gap and photoluminescence (PL) band shift due to the quantum confinement effect were observed. Because the PL band showed a large Stokes shifts over 400 meV, the origin of the PL band was related to the electronic transition via defect levels. A time-resolved PL measurement indicated that the PL lifetime of the QDs was a characteristic feature of three dominating transitions from the conduction band to surface defect level, from the conduction band to an acceptor level, and from the donor level to an acceptor level. It was investigated as a function of temperature in the range from 50 to 373 K to understand the radiative and nonradiative relaxation processes and fitted with two empirical expressions, from which the Huang-Rhys factor and the phonon energy were calculated. According to the fitting data, the size-dependent parameters were analyzed including the Huang-Rhys factor, the average phonon energy, and the excitonic-acoustic phonon coupling coefficient. The temperature coefficient was about -2.32 10-4 eV/K. The results showed that, in the temperature range from 50 to 373 K, the variations of the energy band gap and the photoluminescence line broadening were predominantly due to an optical transition from the band edge to the defect-related level and the coupling of the carriers to acoustic phonon, respectively. 2013 American Chemical Society.
收录类别	SCI ; EI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/40896
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Liu W.,Zhang Y.,Zhai W.,et al. Temperature-dependent photoluminescence of ZnCuInS/ZnSe/ZnS quantum dots[J]. Journal of Physical Chemistry C,2013,117(38).
APA	Liu W..,Zhang Y..,Zhai W..,Wang Y..,Zhang T..,...&Yu W. W..(2013).Temperature-dependent photoluminescence of ZnCuInS/ZnSe/ZnS quantum dots.Journal of Physical Chemistry C,117(38).
MLA	Liu W.,et al."Temperature-dependent photoluminescence of ZnCuInS/ZnSe/ZnS quantum dots".Journal of Physical Chemistry C 117.38(2013).

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Liu-2013-Temperature（460KB）			开放获取	CC BY-NC-ND	浏览下载