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Triplet exciton lifetime in crystalline pyrene

โœ Scribed by L. Peter; G. Vaubel

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
488 KB
Volume
18
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

The triplet exciton life!ime in crystalline pyrene is found to be 140 * 10 msec at ioom temperature, ovel 500 times longer than previously reported values. The temperature dcpcr,dencc of the triplet iifetimc haz been measured over the range 80-301l'K. The rate of bimolecular annihilation of triplet cxcitons in pyrene is found to be indcpendent of temperature over the range ISO-300%. It is concluded that the transfer of tripist encr= within rha crysmi may be described using the monomer esciton model.

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Preliminary measurements of the triplet diffusivity tensor in cryStalline pyrene at 300 K are reported. Maximum diffusiGily occus along the b axis and L+,b = (1.25 f 0.3) X lO+ cm' s-' \_ Diffusion in the UC' p!ane is nearly isotropic with D J (0.3 \* 0.1) X lb\* cm' s-' . These results are tentativ

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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 ex