Indiana University-Purdue University Indianapolis (IUPUI) / Optical refrigeration in quantum dots was carried out in this research. Zinc-blende
crystalline CdSe/CdS (core/shell structure) QDs with complete surface passivation were synthesized and been used as the cooling substance.
Phonon-assisted up-conversion photoluminescence driven by sub-band
gap laser excitation was utilized as the cooling mechanism in the QD samples. A net
cooling efficiency was predicted by a semi-empirical model developed during the research, within a range of the laser excitation energy, even
after taking into account possible parasitic heating processes. To observe the cooling
effect, the experiment was carried out in a thermally isolated environment, which temperature
was also monitored. By using an optical thermometry technique developed
for this research, a maximum temperature drop around 0.68 K was observed in the
experiment. This development paves the way to use QDs' cooling in new industrial
and fundamental research approaches.
| Identifer | oai:union.ndltd.org:IUPUI/oai:scholarworks.iupui.edu:1805/20964 |
| Date | 12 1900 |
| Creators | Hua, Muchuan |
| Contributors | Decca, Ricardo S., Li, Tongcang, Cheng, Ruihua, Joglekar, Yogesh N., Liu, Jing |
| Source Sets | Indiana University-Purdue University Indianapolis |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
| Rights | Attribution 3.0 United States, http://creativecommons.org/licenses/by/3.0/us/ |
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