Photostability of single-photon emission from a single quantum dot in the 650-nm wavelength band at room temperature |
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Authors: | X Xu T Yamada and A Otomo |
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Institution: | (1) Kobe Advanced Research Center, National Institute of Information and Communications Technology, 588-2 Iwaoka, Nishi-Ku, Kobe 651-2492, Japan;(2) State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China |
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Abstract: | The photoluminescence correlation from a single CdSe nanocrystal under pulsed excitation is studied, and a single photon is
realized at wavelength 655 nm at room temperature. The single colloidal CdSe quantum dot is prepared on a SiO2/silicon surface by a drop-and-drag technique. The long-term stability of the single-photon source is investigated; it is
found that the antibunching effect weakens with excitation time, and the reason for the weakening is attributed to photobleaching.
The lifetimes of photoluminescence from a single quantum dot are analyzed at different excitation times. By analyzing the
probability distribution of on and off times of photoluminescence, the Auger assisted tunneling and Auger assisted photobleaching models are applied to explain
the antibunching phenomenon. |
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Keywords: | PACS" target="_blank">PACS 42 50 Dv 42 50 Ar 78 67 Hc |
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