Share Email Print
cover

Proceedings Paper

Optical characterization of bare CdSe and CdSe/CdS core/shell nanocrystals
Author(s): L. M. An; P. N. Sun; L. Liu; X. Feng; L. P. Kong; H. N. Bi; B. Yu; X. G. Kong; Y. C. Liu
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Thiol-capped CdSe/CdS core/shell nanocrystals (NCs) which show high luminescence quantum yield are synthesized in an aqueous solution. UV-Vis absorption spectroscopy and photoluminescence (PL) spectroscopy are employed to analyze optical characters and stabilities of NCs. Furthermore, PL properties are studied in a temperature range between 77K and 300K. The PL peak position of bare CdSe NCs shifts toward shorter wavelengths and the band becomes sharper with decreasing temperature. On the same condition, the PL peak position of CdSe/CdS core/shell NCs keeps unconverted nearly with the variation of temperature. Photostability of bare CdSe NCs and CdSe/CdS core/shell NCs are compared under the 325nm laser irradiation. It takes 78 seconds that the PL intensity declines to the half for CdSe NCs, but 442 seconds for CdSe/CdS core/shell NCs. The fluorescence decay lifetime increases about six times after overcoating. The results indicate that the CdS shell can improve the low temperature PL stability and photostability of CdSe NCs effectively.

Paper Details

Date Published: 2 February 2006
PDF: 8 pages
Proc. SPIE 6026, ICO20: Biomedical Optics, 60261H (2 February 2006); doi: 10.1117/12.667676
Show Author Affiliations
L. M. An, Heilongjiang Univ. (China)
P. N. Sun, Heilongjiang Univ. (China)
L. Liu, Heilongjiang Univ. (China)
X. Feng, Heilongjiang Univ. (China)
L. P. Kong, Heilongjiang Univ. (China)
H. N. Bi, Heilongjiang Univ. (China)
B. Yu, Heilongjiang Univ. (China)
X. G. Kong, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Y. C. Liu, Changchun Institute of Optics, Fine Mechanics and Physics (China)


Published in SPIE Proceedings Vol. 6026:
ICO20: Biomedical Optics

© SPIE. Terms of Use
Back to Top