Exploration of CdTe quantum dots as mesoscale pressure sensors via time-resolved shock-compression photoluminescent emission spectroscopy

The nanometer size of CdTe quantum dots (QDs) and their unique optical properties, including size-tunable narrow photoluminescent emission, broad absorption, fast photoluminescence decay, and negligible light scattering, are ideal features for spectrally tagging the shock response of localized regio...

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Bibliographic Details
Published in:Journal of applied physics 2016-07, Vol.120 (4)
Main Authors: Kang, Zhitao, Banishev, Alexandr A., Lee, Gyuhyon, Scripka, David A., Breidenich, Jennifer, Xiao, Pan, Christensen, James, Zhou, Min, Summers, Christopher J., Dlott, Dana D., Thadhani, Naresh N.
Format: Article
Language:English
Subjects:
ABSORPTION
Applied physics
CADMIUM TELLURIDES
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COMPRESSION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Decay rate
EMISSION SPECTROSCOPY
Emissions control
Glass fiber reinforced plastics
LASERS
LIGHT SCATTERING
MATRIX MATERIALS
Mesoscale spectroscopy
NANOCOMPOSITES
OPTICAL PROPERTIES
PARTICULATES
PHOTOLUMINESCENCE
PRESSURE MEASUREMENT
PRESSURE RANGE GIGA PA
Pressure sensors
PVA
QUANTUM DOTS
SENSORS
Shock loading
SODIUM SILICATES
Spectrum analysis
STEADY-STATE CONDITIONS
Time compression
TIME RESOLUTION
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Summary:The nanometer size of CdTe quantum dots (QDs) and their unique optical properties, including size-tunable narrow photoluminescent emission, broad absorption, fast photoluminescence decay, and negligible light scattering, are ideal features for spectrally tagging the shock response of localized regions in highly heterogeneous materials such as particulate media. In this work, the time-resolved laser-excited photoluminescence response of QDs to shock-compression was investigated to explore their utilization as mesoscale sensors for pressure measurements and in situ diagnostics during shock loading experiments. Laser-driven shock-compression experiments with steady-state shock pressures ranging from 2.0 to 13 GPa were performed on nanocomposite films of CdTe QDs dispersed in a soft polyvinyl alcohol polymer matrix and in a hard inorganic sodium silicate glass matrix. Time-resolved photoluminescent emission spectroscopy was used to correlate photoluminescence changes with the history of shock pressure and the dynamics of the matrix material surrounding the QDs. The results revealed pressure-induced blueshifts in emitted wavelength, decreases in photoluminescent emission intensity, reductions in peak width, and matrix-dependent response times. Data obtained for these QD response characteristics serve as indicators for their use as possible time-resolved diagnostics of the dynamic shock-compression response of matrix materials in which such QDs are embedded as in situ sensors.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4959257