The authors investigated the energy transfer between the chromophors of a white emitting polyspirobifluorene copolymer containing a blue emitting backbone, a green, and a red emitting dye. They demonstrate that the green dye is mainly excited by blue -> green Forster resonant energy transfer (FRET), with a Forster radius R-0bg=35 A. The red dye is instead excited by direct blue -> red FRET (R-0br=21 A) and by sequential blue -> green -> red FRET (R-0gr=31 A). Finally, the authors show that the FRET processes, fundamental to have white emission, are of intermolecular nature, while intramolecular energy migration and transfer are negligible
Intermolecular sequential energy transfer in thin films of a white emitting copolymer
GIGLI, Giuseppe;ANNI, Marco;CINGOLANI, Roberto
2006-01-01
Abstract
The authors investigated the energy transfer between the chromophors of a white emitting polyspirobifluorene copolymer containing a blue emitting backbone, a green, and a red emitting dye. They demonstrate that the green dye is mainly excited by blue -> green Forster resonant energy transfer (FRET), with a Forster radius R-0bg=35 A. The red dye is instead excited by direct blue -> red FRET (R-0br=21 A) and by sequential blue -> green -> red FRET (R-0gr=31 A). Finally, the authors show that the FRET processes, fundamental to have white emission, are of intermolecular nature, while intramolecular energy migration and transfer are negligibleI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
