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Phys. Rev. B 68, 125318 (2003) [6 pages]

Photoluminescence upconversion in colloidal CdTe quantum dots

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Xiaoyong Wang1, W. William Yu2, Jiayu Zhang1, Jose Aldana2, Xiaogang Peng2, and Min Xiao1,*
1Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
2Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, USA

Received 16 December 2002; revised 20 May 2003; published 22 September 2003

Efficient photoluminescence (PL) up-conversion has been observed in colloidal CdTe quantum dots with an energy gain of as high as 360 meV. Compared with the normal PL, the peak energy of this up-converted PL (UCPL) shows a redshift of about 80 meV, and the corresponding radiative lifetime becomes nearly twice as long. This UCPL is attributed to the carrier recombination involving surface states mainly through a thermal excitation process.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.68.125318
DOI:
10.1103/PhysRevB.68.125318
PACS:
78.47.+p, 78.67.Bf, 78.55.Et

*Email address: mxiao@mail.uark.edu

 
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