Triplet excitons in 4,4'-dichlorobenzophenone
Low-temperature optical and magnetic resonance experiments, both continuous-wave (CW) and time-resolved, have been performed on photoexcited single crystals of 4,4'-dichlorobenzophenone (DCBP). The CW results show the presence of both triplet excitons and several intrinsic traps in this system. A kinetic model is developed to describe excitation transport between exciton and trap states in the presence of resonant microwaves. By comparing the results of the time-resolved experiments with the predictions of the model, we conclude that the triplet exciton lifetime in DCBP is of the order of microseconds or less. This lifetime, which is much shorter than those in pseudo-one-dimensional systems, appears to be a consequence of the two-dimensional nature of the exchange interaction in the DCBP crystal.
- Research Organization:
- Univ. of Pittsburgh, PA
- DOE Contract Number:
- AC02-76ER03435
- OSTI ID:
- 6592566
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 86:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BENZOPHENONE
EXCITED STATES
MONOCLINIC LATTICES
CHLORINATED AROMATIC HYDROCARBONS
EXCITONS
MONOCRYSTALS
PHOSPHORESCENCE
PHOTOCHEMISTRY
TEMPERATURE DEPENDENCE
TRAPS
TRIPLETS
AROMATICS
CHEMISTRY
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
ENERGY LEVELS
HALOGENATED AROMATIC HYDROCARBONS
KETONES
LUMINESCENCE
MULTIPLETS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
QUASI PARTICLES
400500* - Photochemistry