Laser-excited optical emission response of CdTe quantum dot/polymer nanocomposite under shock compression
| Autor: | Dana D. Dlott, Pan Xiao, Min Zhou, Naresh N. Thadhani, Christopher J. Summers, David Scripka, Zhitao Kang, Alexandr A. Bansihev, James M. Christensen, Jennifer Breidenich |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Photoluminescence Physics and Astronomy (miscellaneous) business.industry 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Molecular physics Shock (mechanics) law.invention Blueshift Wavelength Optics law Quantum dot Excited state 0103 physical sciences 010306 general physics 0210 nano-technology business Quasistatic process |
| Zdroj: | Applied Physics Letters. 108:011908 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/1.4939701 |
| Popis: | 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 experim... |
| Databáze: | OpenAIRE |
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