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Quenching of triplet excitions by trapped holes in crystalline pyrene

✍ Scribed by H. Bouchriha; M. Schott; M. Bisceglia; G. Delacote

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
360 KB
Volume
23
Category
Article
ISSN
0009-2614

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✦ Synopsis

The rate of quenching of triplet ercirons by trapped holes in crystalline pyrene has been measured as a function of hole concentration, The rate constant is 7 = 4.5 X lo-'t cm3 set -' within 50%, not far below that of a diffusion limited process. The quenching by free holes is not observed in the experimental conditions used.

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The quenching of triplet-excited )C6e by electron acceptors TCNQ and TCNE has been established in nonpolar toluene and moderately polar benzonitrile solutions. The quenching constants k, are 5.5 x IO' in toluene, 2.2 x 10' in benzonitrile for TCNQ and 7.9~ IO' in toluene, 4.2 x 10' (M s)-' in benxon