Laser-excited optical emission response of CdTe quantum dot/polymer nanocomposite under shock compression

Laser-driven shock compression experiments and corresponding finite element method simulations are carried out to investigate the blueshift in the optical emission spectra under continuous laser excitation of a dilute composite consisting of 0.15% CdTe quantum dots by weight embedded in polyvinyl al...

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Veröffentlicht in:Applied physics letters 2016-01, Vol.108 (1)
Hauptverfasser: Xiao, Pan, Kang, Zhitao, Bansihev, Alexandr A., Breidenich, Jennifer, Scripka, David A., Christensen, James M., Summers, Christopher J., Dlott, Dana D., Thadhani, Naresh N., Zhou, Min
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container_title Applied physics letters
container_volume 108
creator Xiao, Pan
Kang, Zhitao
Bansihev, Alexandr A.
Breidenich, Jennifer
Scripka, David A.
Christensen, James M.
Summers, Christopher J.
Dlott, Dana D.
Thadhani, Naresh N.
Zhou, Min
description Laser-driven shock compression experiments and corresponding finite element method simulations are carried out to investigate the blueshift in the optical emission spectra under continuous laser excitation of a dilute composite consisting of 0.15% CdTe quantum dots by weight embedded in polyvinyl alcohol polymer. This material is a potential candidate for use as internal stress sensors. The analyses focus on the time histories of the wavelength blue-shift for shock loading with pressures up to 7.3 GPa. The combined measurements and calculations allow a relation between the wavelength blueshift and pressure for the loading conditions to be extracted. It is found that the blueshift first increases with pressure to a maximum and subsequently decreases with pressure. This trend is different from the monotonic increase of blueshift with pressure observed under conditions of quasistatic hydrostatic compression. Additionally, the blueshift in the shock experiments is much smaller than that in hydrostatic experiments at the same pressure levels. The differences in responses are attributed to the different stress states achieved in the shock and hydrostatic experiments and the time dependence of the mechanical response of the polymer in the composite. The findings offer a potential guide for the design and development of materials for internal stress sensors for shock conditions.
doi_str_mv 10.1063/1.4939701
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Applied physics
CADMIUM TELLURIDES
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COMPRESSION
Computer simulation
DESIGN
EMISSION
Emission analysis
EMISSION SPECTRA
EXCITATION
Experiments
FINITE ELEMENT METHOD
Hydrostatic compression
LASERS
Mechanical analysis
Nanocomposites
Polymers
POTENTIALS
PRESSURE RANGE GIGA PA
PVA
QUANTUM DOTS
Residual stress
RESIDUAL STRESSES
SENSORS
Shock loading
SIMULATION
TIME DEPENDENCE
WAVELENGTHS
WEIGHT
title Laser-excited optical emission response of CdTe quantum dot/polymer nanocomposite under shock compression
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