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

Authors :
Zhitao Kang
Banishev, Alexandr A.
Gyuhyon Lee
Scripka, David A.
Breidenich, Jennifer
Pan Xiao
Christensen, James
Min Zhou
Summers, Christopher J.
Dlott, Dana D.
Thadhani, Naresh N.
Source :
Journal of Applied Physics; 7/28/2016, Vol. 120 Issue 4, p1-10, 10p, 1 Diagram, 6 Graphs
Publication Year :
2016

Abstract

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 timeresolved 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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00218979
Volume :
120
Issue :
4
Database :
Complementary Index
Journal :
Journal of Applied Physics
Publication Type :
Academic Journal
Accession number :
117128342
Full Text :
https://doi.org/10.1063/1.4959257