DUAL RESONANCE FLUORESCENCE OF POLYDIACETYLENE CHAINS ISOLATED IN THEIR CRYSTALLINE MONOMER MATRIX

Authors
LECUILLER R BERREHAR J LAPERSONNEMEYER C SCHOTT M
Citation
R. Lecuiller et al., DUAL RESONANCE FLUORESCENCE OF POLYDIACETYLENE CHAINS ISOLATED IN THEIR CRYSTALLINE MONOMER MATRIX, Physical review letters, 80(18), 1998, pp. 4068-4071
Citations number
17
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
80
Issue
18
Year of publication
1998
Pages
4068 - 4071
Database
ISI
SICI code
0031-9007(1998)80:18<4068:DRFOPC>2.0.ZU;2-3
Abstract
Fluorescence of isolated polydiacetylene chains in their monomer cryst al is studied. Two different resonant emissions are observed. One is t he weak emission of the free exciton at 1.9 eV at 10 K. The other is a very narrow (1.5 meV FWHM) intense resonance emission line at 2.28 eV and originates from a small fraction of chains with different conform ation. Instantaneous exciton self-trapping is inconsistent with these emissions. The large difference in quantum yields (factor >10(2)) indi cates that electronic relaxation of these chains is very sensitive to changes in chain conformation.