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.
- Physical Review B (Condensed Matter and Materials Physics)
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- 2469-9969; 1098-0121