Photoluminescence upconversion in colloidal CdTe quantum dots

by Wang, Xiaoyong; Yu, W. William; Zhang, Jia-Yu; Aldana, Jose Fernando; Peng, Xiaogang; Xiao, Min

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.

Journal
Physical Review B (Condensed Matter and Materials Physics)
Volume
68
Issue
12
Year
2003
Start Page
125318
ISBN/ISSN
2469-9969; 1098-0121
DOI
10.1103/PhysRevB.68.125318