Thursday, 27 March, 2008
Exciton Energy Transfer in Pairs of Single-Walled Carbon Nanotubes
Huihong Qian et.al. -
Nano Letters, Vol.8, No.5, S. 1363-1367, (2008)
We studied the exciton energy transfer in pairs of semiconducting nanotubes using high-resolution optical microscopy and spectroscopy on the nanoscale. Photoluminescence from large band gap nanotubes within bundles is observed with spatially varying intensities due to distance-dependent internanotube transfer. The range of efficient energy transfer is found to be limited to a few nanometers because of competing fast nonradiative relaxation responsible for low photoluminescence quantum yield.