Qian, Huihong; Georgi, Carsten; Anderson, Neil; Green, Alexander A.; Hersam, Mark C.; Novotny, Lukas; Hartschuh, Achim
Exciton Energy Transfer in Pairs of Single-Walled Carbon Nanotubes.
In: Nano Letters, Vol. 8, No. 5: pp. 1363-1367
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.