National Changhua University of Education Institutional Repository : Item 987654321/16736

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NCUEIR > College of Science > Department of Physics > Periodical Articles > Item 987654321/16736

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/16736

Title:	Photothermal Deflection and Photoluminescence Studies of CdS and CdSe Quantum Dots
Authors:	Yuang, Yu‐Shen;Chen, Yang‐Fang;Lee, Yang‐Yao;Liu, Li‐Chi
Contributors:	物理學系
Date:	1994-09
Issue Date:	2013-06-05T07:46:14Z
Publisher:	American Institute of Physics
Abstract:	We report on the observation of the quantum confinement effect by using photothermal deflection spectroscopy (PDS) experiment and the time dependence of optically induced degradation in CdS and CdSe semiconductor‐doped glasses. The observed absorption peaks in the PDS experiment, together with a simple model, were used to evaluate the average radius of semiconductor microcrystals. It is found that the estimated average radii of quantum dots are consistent with that obtained from other methods. This result demonstrates that the PDS technique provides an alternative tool for the study of the optical properties of semiconductor microscrystals. The time dependence of the luminescence degradation of the impurity band, which is attributed to the process of Auger ionization, follows a stretched‐exponential function. The inconsistency with the previously proposed exponential relaxation may be due to the size distribution of CdS and CdSe microcrystals.
Relation:	Journal of Applied Physics, 76(5): 3041-3044
Appears in Collections:	[Department of Physics] Periodical Articles

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