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Laser-induced triplet excitons in the columnar phases of an octasubstituted zinc phthalocyanine

✍ Scribed by Dimitra Markovitsi; Isabelle Lécuyer

Book ID
103028259
Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
314 KB
Volume
149
Category
Article
ISSN
0009-2614

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✦ Synopsis

Laser-induced triplet excitons in the columnar crystalline and liquid-crystalline phases of an octasubstituted zinc phthalocyanine have been studied by nanosecond absorption spectroscopy. For low-energy excitation, exponential decay kinetics are obtained; the triplet lifetime is phase dependent (r=21.5 1s for the crystal. 5= 10.0 ps for the liquid crystal). For high-energy excitation second-order decay kinetics are observed. Triplet-triplet annihilation is more rapid in the liquid crystal than in the crystal by a factor of 13. The triplet exciton diffusion coefficient indicates that exciton diffusion is ten times more efficient in the liquid crystal than in the crystal.

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