ISSN:
1057-9257
Schlagwort(e):
Luminescence
;
Molecularly doped polymers
;
Delayed luminescence
;
Geminate pair recombination
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Elektrotechnik, Elektronik, Nachrichtentechnik
,
Physik
Notizen:
Decay of the delayed luminescence of 1,1-bis(di-4-tolylaminophenyl)cyclohexane, both doped into a polycarbonate binder and matrix-isolated in an MTHF glass, has been studied upon excitation with the 308 nm line of an excimer laser. Time-resolved emission spectra have also been recorded. In the early time regime, 30 ns 〈 t 〈 10 μs, the decay of the emission, identified as delayed fluorescence rather than phosphorescence, follows a power-law characteristic of geminate pair recombination in a disordered medium. Singlet-singlet excitation fusion is considered to be the main pathway for geminate pair formation. Fusion of triplet excitations becomes important for e-h pair formation at long times only (10 μs 〈 t 〈 10 ms). The rate of triplet-triplet encounters carries a time dependence characteristic of the random walk of excitations in a disordered solid.
Zusätzliches Material:
8 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/amo.860010404
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