標題: | Spectroscopy and femtosecond dynamics of type-II CdTe/CdSe core-shell quantum dots |
作者: | Chou, PT Chen, CY Cheng, CT Pu, SC Wu, KC Cheng, YM Lai, CW Chou, YH Chiu, HT 應用化學系 Department of Applied Chemistry |
公開日期: | 16-Jan-2006 |
摘要: | Syntheses of CdTe/CdSe type-II quantum dots (QDs) using CdO and CdCl2, as precursors for core and shell, respectively, are reported. Characterization was made via near-IR interbond emission, transmission electron microscopy (TEM), energy dispersive spectroscopy (EDX), and X-ray diffraction (XRD). Femtosecond fluorescence upconversion measurements on the relaxation dynamics of the CdTe core (in CdTe/CdSe) emission and CdTe/CdSe inter-band emission reveal that as the size of the core increases from 5.3, 6.1 to 6.9 nm, the rate of photoinduced electron separation decreases from 1.96, 1.44 to 1.07 X 10(12) s(-1). The finite rates of the initial charge separation ore tentatively rationalized by the small electron-phonon coupling, causing weak coupling between the initial and charge-separated states. |
URI: | http://dx.doi.org/10.1002/cphc.200500307 http://hdl.handle.net/11536/12729 |
ISSN: | 1439-4235 |
DOI: | 10.1002/cphc.200500307 |
期刊: | CHEMPHYSCHEM |
Volume: | 7 |
Issue: | 1 |
起始頁: | 222 |
結束頁: | 228 |
Appears in Collections: | Articles |
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