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.
Optical Nanostructures Laboratory, Center for Integrated Science and Engineering, Columbia University, New York, New York 10027, USA. rb2261@columbia.edu
Ranojoy
R
Bose
James F
JF
McMillan
Jie
J
Gao
Kelly M
KM
Rickey
Charlton J
CJ
Chen
Dmitri V
DV
Talapin
Christopher B
CB
Murray
Chee Wei
CW
Wong