ORGANIC MOLECULAR SOLIDS.
Abstract
Experimental evidence was found for transport of electronic excitation energy in pyrene crystals by trivial transfer, excimer exciton migration, and monomer migration. The relative importance of these various transfer mechanisms depends upon the geometry of the sample, the nature of the acceptors, the acceptor concentration, and the temperature. Trivial transfer was important in the perylene doped samples, but not in the samples containing azulene as the acceptor. The photogeneration of free electrons in the short wavelength region is shown to involve a direct optical transition to a conducting state of the pyrene crystal with a threshold of approx. 4.1 ev. Hole generation in the short wavelength region involves comparable contributions from an intrinsic, as well as an extrinsic, impurity dependent process. Long wavelength generation of holes involves migration of mobile monomer singlet excitons to the surface of the crystal where ionization occurs.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 20, 1967
- Accession Number
- AD0659401
Entities
People
- David R. Kearns
Organizations
- University of California, Riverside