Accession Number : ADA330211

Title :   Intrinsically Trapped Triplet Excitons in pi-Conjugated Polymers

Descriptive Note : Technical rept.

Corporate Author : OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS

Personal Author(s) : Partee, J. ; Shinar, J. ; Jessen, S. W. ; Epstein, A. J. ; Graupner, W.

PDF Url : ADA330211

Report Date : 20 SEP 1997

Pagination or Media Count : 16

Abstract : The X-band spin 1 photoluminescence-detected magnetic resonance of frozen toluene solutions of poly (p-phenylene ethynylene) (PPE) and poly (p-phenylene)-type ladder (LPPP) polymers are presented. The amplitude of the 800-1100 G wide triplet resonance pattern decreases with decreasing concentration of PPE in toluene and tetrahydrofuran; in frozen saturated solutions of LPPP it is about half of that in neat films. The results suggest the resonance is largely due to a long-lived (^30 microsecs) trapped triplet exciton state localized on a phenylene ring and stabilized by coupling to a segment of an adjacent chain. The role of this trapped triplet in the photophysics of pi-conjugated polymers is discussed.

Descriptors :   *POLYMERS, *TRAPPING(CHARGED PARTICLES), PHOTOLUMINESCENCE, MAGNETIC RESONANCE, EXCITONS, TOLUENES, POLYPHENYLENES, PHASE CONJUGATION.

Subject Categories : Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE