Delayed fluorescence and triplet-triplet annihilation in pi-conjugated polymers

Authors
Partee, J Frankevich, EL Uhlhorn, B Shinar, J Ding, Y Barton, TJ
Citation
J. Partee et al., Delayed fluorescence and triplet-triplet annihilation in pi-conjugated polymers, PHYS REV L, 82(18), 1999, pp. 3673-3676
Citations number
31
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
82
Issue
18
Year of publication
1999
Pages
3673 - 3676
Database
ISI
SICI code
0031-9007(19990503)82:18<3673:DFATAI>2.0.ZU;2-X
Abstract
The delayed fluorescence of poly(p-phenylene vinylene) (PPV) and poly(p-phe nylene ethynylene) (PPE) derivative solids and frozen solutions at 20 K is described. It provides strong evidence for triplet-triplet annihilation to singlets excitons, accounting for up to similar to 3% of the total emission in PPV films and similar to 1.5% in PPE powder. It also yields triplet lif etimes of 70 and 110 mu s in PPV films and frozen solutions, and similar to 200 and similar to 500 mu s in PPE powder and frozen solutions, respective ly. [S0031-9007(99)09010-9].