CdS 和 CdSe 胶体量子点的中红外光致发光。

Mid-Infrared Photoluminescence of CdS and CdSe Colloidal Quantum Dots.

机构信息

James Franck Institute, The University of Chicago , 929 East 57th Street, Chicago, Illinois 60637, United States.

出版信息

ACS Nano. 2016 Feb 23;10(2):2225-31. doi: 10.1021/acsnano.5b06882. Epub 2016 Jan 27.

Abstract

Mid-infrared intraband photoluminescence is observed from CdSe and CdS colloidal quantum dots (CQDs) and core/shell systems when excited by a visible laser. The CQDs show more intraband photoluminescence with dodecanethiol than with other ligands. Core/shells show an increase of the intraband photoluminescence with increasing shell thickness. The detected emission is restricted to below 2900 cm(-1), bounded by the C-H vibrational modes of the organic ligands. Upon photoexcitation in air for all dodecanethiol ligands capped CQD systems studied, the intraband photoluminescence is quenched over time, and emission at lower frequency is observed, which is assigned to laser heating and thermal emission from oxides.

摘要

从中波红外区的光致发光观察到 CdSe 和 CdS 胶体量子点（CQDs）和核/壳系统在可见激光激发时的光致发光。与其他配体相比，巯基十二烷（dodecanethiol）使 CQDs 显示出更多的中波红外区光致发光。核/壳系统的中波红外区光致发光随着壳层厚度的增加而增加。所检测到的发射被限制在 2900cm(-1)以下，这是由有机配体的 C-H 振动模式决定的。在空气中对所有使用巯基十二烷配体的 CQD 系统进行光激发后，中波红外区光致发光随时间衰减，同时观察到较低频率的发射，这归因于激光加热和氧化物的热发射。