A NEW APPROACH TO THE CALCULATION OF THE TRIPLET-TRIPLET INTERACTION CONSTANT IN MOLECULAR-CRYSTALS

Authors
BENFREDJ A ROMDHANE S MONGE JL BOUCHRIHA H
Citation
A. Benfredj et al., A NEW APPROACH TO THE CALCULATION OF THE TRIPLET-TRIPLET INTERACTION CONSTANT IN MOLECULAR-CRYSTALS, Journal de physique. I, 7(2), 1997, pp. 349-370
Citations number
30
Categorie Soggetti
Physics
Journal title
Journal de physique. I → ACNP
ISSN journal
11554304
Volume
7
Issue
2
Year of publication
1997
Pages
349 - 370
Database
ISI
SICI code
1155-4304(1997)7:2<349:ANATTC>2.0.ZU;2-V
Abstract
A new approach to the calculation of the mutual annihilation rate cons tant of triplet excitons in molecular crystals is presented. The forma lism includes spin relaxation and the exciton motion dimentionality ef fect. This method is applied to the study of magnetic field modulation of delayed fluorescence in four molecular crystals: anthracene, napht alene, paraterphenyl and pyrene. The agreement of the best fit between experiment and theory allowed us to reach an average spacing interact ion of the order of 30 Angstrom with annihilation rate constants rangi ng between 10(9) and 10(10) s(-1) depending on the considered material s.