Temperature-sensitive photoluminescent CdSe-ZnS polymer composite film for lock-in photothermal characterization

Journal Article · Tue Jun 14 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4953591· OSTI ID:22596791

Liu, Liwang; Meng, Lei; Wang, Ling; Glorieux, Christ ^[1]; Zhong, Kuo ^[2]; Van Hemelrijck, Danny ^[3]

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1. Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200D, B-3001 Heverlee (Belgium)
2. Department of Chemistry, Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200 F- box 2404, 3001 Heverlee (Belgium)
3. Department of Mechanics of Materials and Constructions, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels (Belgium)

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.

• OSTI ID: 22596791
• Journal Information: Journal of Applied Physics, Vol. 119, Issue 22; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 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