skip to main content

SciTech ConnectSciTech Connect

Title: Photo-instability of CdSe/ZnS quantum dots in poly(methylmethacrylate) film

The photo-instability of CdSe/ZnS quantum dots (QDs) has been studied under varied conditions. We discussed the main features of the evolution of photoluminescence (PL) intensity and energy at different laser powers, which showed critical dependences on the environment. The PL red shift in a vacuum showed strong temperature dependence, from which we concluded that the thermal activation energy for trapping states of the charge carriers was about 14.7 meV. Furthermore, the PL spectra showed asymmetric evolution during the laser irradiation, for which two possible explanations were discussed. Those results provided a comprehensive picture for the photo-instability of the colloidal QDs under different conditions.
Authors:
; ; ;  [1]
  1. Key Laboratory of Semiconductor Materials Science and Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083 (China)
Publication Date:
OSTI Identifier:
22217728
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACTIVATION ENERGY; CADMIUM SELENIDES; CHARGE CARRIERS; FILMS; INSTABILITY; LASER RADIATION; MEV RANGE; PHOTOLUMINESCENCE; QUANTUM DOTS; RED SHIFT; SEMICONDUCTOR MATERIALS; SPECTRA; TEMPERATURE DEPENDENCE; TRAPPING; ZINC SULFIDES