期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 118, 期 5, 页码 2749-2753出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp409061g
关键词
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资金
- DARPA COMPASS program through ARO
- [NSF-DMR 1104755]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1104755] Funding Source: National Science Foundation
The photoluminescence quantum yield of HgTe colloidal quantum dots is measured from 1800 to 6500 cm(-1). There is a steep drop to low energy reminiscent of the generic gap law. However, direct evidence of energy transfer to the C-H stretch and overtone vibrations is apparent when temperature tunes the PL wavelength of a given sample through the vibrational resonances. Calculations based on the radiative rate and resonant energy transfer to the ligand vibrations appear to account for much of the quantum yield drop. Power-dependent photoluminescence lifetime measurements on 3.7 nm particles show fast, similar to 50 ps, biexciton lifetime similar to other colloidal quantum dot systems of similar sizes.
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