Investigation of ultrafast dynamics of CdTe quantum dots by femtosecond fluorescence up-conversion spectroscopy

doi:10.1088/1674-1056/21/10/107801

Abstract The ultrafast carrier relaxation processes in CdTe quantum dots are investigated by femtosecond fluorescence up-conversion spectroscopy. Photo-excited hole relaxing to the edge of the forbidden gap takes a maximal time of ～ 1.6 ps with exciting at 400 nm, depending on the state of the photo-excited hole. The shallow trapped states and deep trap states in the forbidden gap are confirmed for CdTe quantum dots. In addition, Auger relaxation of trapped carriers is observed to occur with a time constant of ～ 5 ps. A schematic model of photodynamics is established based on the results of the spectroscopy studies. Our work demonstrates that femtosecond fluorescence up-conversion spectroscopy is a suitable and effective tool in studying the transportation and conversion dynamics of photon energy in a nanosystem.

Keywords: CdTe quantum dots femtosecond fluorescence up-conversion spectroscopy ultrafast dynamics nanomaterial

Received: 11 February 2012
Revised: 07 April 2012
Accepted manuscript online:

PACS:	78.47.N-	(High resolution nonlinear optical spectroscopy)
	78.67.Hc	(Quantum dots)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11074003 and 20973001) and the Key Program of Educational Commission of Anhui Province of China (Grant No. KJ2010A132).

Corresponding Authors: Zhang Hong, Cui Zhi-Feng
E-mail: h.zhang@uva.nl; zfcui@mail.ahnu.edu.cn

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Yao Guan-Xin (姚关心), L¨u Liang-Hong (吕良宏), Gui Mei-Fang (桂美芳), Zhang Xian-Yi (张先燚), Zheng Xian-Feng (郑贤锋), Ji Xue-Han (季学韩), Zhang Hong (张宏), Cui Zhi-Feng (崔执凤) Investigation of ultrafast dynamics of CdTe quantum dots by femtosecond fluorescence up-conversion spectroscopy 2012 Chin. Phys. B 21 107801

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Investigation of ultrafast dynamics of CdTe quantum dots by femtosecond fluorescence up-conversion spectroscopy

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