Photoluminescence upconversion in colloidal CdTe quantum dots
by Wang, X. Y.; Yu, W. W.; Zhang, J. Y.; Aldana, J.; Peng, X. G.; Xiao, M.
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)
- 1550-235X; 1098-0121