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Author Liu, Liwang ♦ Meng, Lei ♦ Wang, Ling ♦ Glorieux, Christ ♦ Zhong, Kuo ♦ Van Hemelrijck, Danny
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ CADMIUM SELENIDES ♦ EXCITATION ♦ FILMS ♦ FLUORESCENCE ♦ FLUORESCENCE SPECTROSCOPY ♦ FREQUENCY DEPENDENCE ♦ FREQUENCY RANGE ♦ LAYERS ♦ NANOCOMPOSITES ♦ PHOTOLUMINESCENCE ♦ POLYSTYRENE ♦ QUANTUM DOTS ♦ READOUT SYSTEMS ♦ SENSORS ♦ SIGNALS ♦ SUBSTRATES ♦ TEMPERATURE DEPENDENCE ♦ THERMODYNAMIC PROPERTIES ♦ ZINC SULFIDES
Abstract The temperature dependence of the fluorescence spectrum of CdSe−ZnS core–shell quantum dots embedded in a polystyrene matrix is characterized between 30 °C and 60 °C. The spectrally integrated photoluminescence intensity is found to linearly decrease with −1.3%/ °C. This feature is exploited in a dual coating-substrate-configuration, consisting of a layer of this nanocomposite material, acting as a temperature sensor with optical readout, on top of an optically absorbing and opaque layer, acting as a photothermal excitation source, and covering a substrate material or structure of interest. From the frequency dependence of the optically detected photothermal signal in the frequency range between 5 Hz and 150 Hz, different thermal parameters of the constituent layers are determined. The fitted values of thermal properties of the different layers, determined in different scenarios in terms of the used a priori information about the layers, are found to be internally consistent, and consistent with literature values.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-06-14
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 119
Issue Number 22


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