Luminescence of the flexible dye molecule julolidinemalononitrile in polymer matrices at pressures above 40 kbar
✍ Scribed by J.M. Lang; A.A. Dadali; H.G. Drickamer
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 347 KB
- Volume
- 214
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
We study the luminescence c&ziency ofjulolidincmalononitrile (JDMN) as a function of pressure in a series ofvinyl polymers, PVAs, PVCl, PS, PVP and PlVN which exhibit increasing polarizability in the order listed. This molecule has both a planar and twisted excited state. Only the former emits luminescence. We concentrateon the behavior at pressures above 40 kbar. A decrease in intensity of emission is found with pressure which is larger, the larger the polarizability of the medium. This decrease results from increased stabilization of the polar twisted state with pressure in the more polarizable media.