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Luminescence studies in polymers—II: Temperature effect on polyvinylcarbazole fluorescence

✍ Scribed by C. David; M. Piens; G. Geuskens

Publisher
Elsevier Science
Year
1972
Tongue
English
Weight
350 KB
Volume
8
Category
Article
ISSN
0014-3057

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✦ Synopsis

A~raet--Polyvinylcarbazole (PVCa) films and solutions emit normal and excimer fluorescence between 77 and 425 K. The absolute (IM and Iv) and relative (I~/1o) intensities emitted strongly depend on temperature. The usual U-shaped curve is obtained for log IM/Io as a function of lIT in the case of polymer films. In solution, two minima corresponding to two different excimers are observed. The formation and dissociation of PVCa excimers in films and solutions have been interpreted according to the usual kinetic scheme. The binding energies for the excimer in films and for the high temperature excimer in solutions are respectively 4 and 2-8 kcal mole-1.

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