Photoluminescence upconversion in colloidal CdTe quantum dots

被引：103
|
作者：
Wang, XY [1 ]
Yu, WW
Zhang, JY
Aldana, J
Peng, XG
Xiao, M
机构：
[1] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA
[2] Univ Arkansas, Dept Chem & Biochem, Fayetteville, AR 72701 USA
来源：
PHYSICAL REVIEW B | 2003年 / 68卷 / 12期
关键词：
D O I：
10.1103/PhysRevB.68.125318
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
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页数：6
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