Title :
FRET in self-assembled CdTe quantum dot nanoclusters
Author :
Higgins, Clare ; Lunz, Manuela ; Bradley, A. Louise ; Gerard, Valerie A. ; Byrne, Stephen ; Gun, Yurii K.
Author_Institution :
Semicond. Photonics Group, Trinity Coll. Dublin, Dublin, Ireland
Abstract :
Colloidal CdTe quantum dots (QDs) with oppositely charged ligand shells were used to form quantum dot nanoclusters in solution. The signatures of Forster non-radiative energy transfer in the photoluminescence and time-resolved photoluminescence data indicates that the electrostatic attraction draws the QDs into close proximity forming nanoclusters. The smaller QDs act as donors and the larger QDs act as acceptors within the cluster and a FRET efficiency of 45% has been recorded. Both the time-resolved and spectral PL data show a strong donor concentration dependence. The acceptor photoluminescence enhancement and FRET efficiency can be tuned by adjusting the donor acceptor ratio.
Keywords :
cadmium compounds; nonradiative dielectric waveguides; photoluminescence; self-assembly; semiconductor quantum dots; CdTe; FRET efficiency; Forster nonradiative energy transfer; acceptor photoluminescence enhancement; colloidal CdTe quantum dot; donor acceptor ratio; electrostatic attraction; oppositely charged ligand shells; self-assembled quantum dot nanocluster; Absorption; Biomedical optical imaging; Bonding; Educational institutions; Energy exchange; Photoluminescence; Quantum dots; Resonance; Self-assembly; Spectroscopy; Forster resonant energy transfer (FRET); colloidal CdTe quantum dots; optical spectroscopy; time-resolved photoluminescence;
Conference_Titel :
Transparent Optical Networks (ICTON), 2010 12th International Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-7799-9
Electronic_ISBN :
978-1-4244-7797-5
DOI :
10.1109/ICTON.2010.5549025
