Temperature-tuning of near-infrared monodisperse quantum dot solids at   1.5 um for controllable Forster energy transfer
  We present the first time-resolved cryogenic observations of Forster energy transfer in large, monodisperse lead sulphide quantum dots with ground state transitions near 1.5 um (0.83 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 um 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. 
Ranojoy Bose, James F. McMillan, Jie Gao, Kelly M. Rickey, Charlton J.   Chen, Dmitri V. Talapin, Christopher B. Murray, and...