Luminescence of the flexible dye molecule julolidinemalononitrile in polymer matrices at pressures above 40 kbar

We study the luminescence efficiency of julolidinemalononitrile (JDMN) as a function of pressure in a series of vinyl polymers, PVAs, PVCI, PS, PVP and PIVN which exhibit increasing polarizability in the order listed. This molecule has both a planar and twisted excited state. Only the former emits l...

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Bibliographic Details
Published in:Chemical physics letters 1993-11, Vol.214 (3), p.310-314
Main Authors: Lang, J.M., Dadali, A.A., Drickamer, H.G.
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Fluorescence and phosphorescence spectra
Fluorescence and phosphorescence
radiationless transitions, quenching (intersystem crossing, internal conversion)
Molecular properties and interactions with photons
Physics
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Summary:We study the luminescence efficiency of julolidinemalononitrile (JDMN) as a function of pressure in a series of vinyl polymers, PVAs, PVCI, PS, PVP and PIVN which exhibit increasing polarizability in the order listed. This molecule has both a planar and twisted excited state. Only the former emits luminescence. We concentrate on 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.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(93)85641-Z