期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 120, 期 16, 页码 8502-8508出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b01679
关键词
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资金
- National Science Foundation (NSF) [DMR-1307066]
- University of Minnesota
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1307066] Funding Source: National Science Foundation
Organic semiconductors characterized by a small singlet-triplet exciton energy splitting exhibit efficient reverse intersystem crossing and thermally activated delayed fluorescence. Consequently, exciton transport may occur along both the singlet and the triplet excited states, each with unique photophysical behavior and exciton energy transfer mechanisms. Delayed fluorescence systems, therefore, provide a unique test bed for characterizing the role of exciton spin in transport and diffusion. Concentration- and temperature-dependent photophysical characterization combined with measurements of the exciton diffusion length (L-D) for 1,2,3,5-tetrakis-(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) elucidate the relative degree and magnitude of transport along the singlet and triplet molecular excited states as well as the role of the local dielectric environment in determining the intersystem balance.
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