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 Förster resonant energy transfer (FRET), with a Förster radius R0bg=35 Å. The red dye is instead excited by direct blue →red FRET (R0br=21 Å) and by sequential blue→green→red FRET (R0gr=31 Å). 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 a white emitting copolymer
ANNI, Marco;LATTANTE, SANDRO;CINGOLANI, Roberto;GIGLI, Giuseppe
2006
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 Förster resonant energy transfer (FRET), with a Förster radius R0bg=35 Å. The red dye is instead excited by direct blue →red FRET (R0br=21 Å) and by sequential blue→green→red FRET (R0gr=31 Å). 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.File in questo prodotto:
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