Temperature-tuning of near-infrared monodisperse quantum dot solids at 1.5 microm for controllable forster energy transfer.
We present the first time-resolved cryogenic observations of Forster energy transfer in large, monodisperse lead sulfide quantum dots with ground-state transitions near 1.5 microm (0.8 eV), in environments from 160 K to room temperature. The observed temperature-dependent dipole-dipole transfer rate occurs in the range of (30-50 ns) (-1), measured with our confocal single-photon counting setup at 1.5 microm wavelengths. By temperature-tuning the dots, 94% efficiency of resonant energy transfer can be achieved for donor dots. The resonant transfer rates match well with proposed theoretical models.
Bose
Ranojoy
R
Optical Nanostructures Laboratory, Center for Integrated Science and Engineering, Columbia University, New York, New York 10027, USA. rb2261@columbia.edu
McMillan
James F
JF
Gao
Jie
J
Rickey
Kelly M
KM
Chen
Charlton J
CJ
Talapin
Dmitri V
DV
Murray
Christopher B
CB
Wong
Chee Wei
CW