Confirmation of the role of radicals in energy transfer resulting in induced phosphorescence of irradiated doped poly(methyl methacrylate)

Transient species, in irradiated doped poly(methyl methacrylate) (PMMA), enhance the transfer of energy to the triplet state of the dopant. Production of these transients enables a strong, induced, phosphorescence to occur even at room temperature. This is inhibited by the use of a radical scavenger...

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Bibliographic Details
Published in:Polymer (Guilford) 1976-01, Vol.17 (12), p.1091-1094
Main Authors: Bilen, C.S., Morantz, D.J.
Format: Article
Language:English
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Summary:Transient species, in irradiated doped poly(methyl methacrylate) (PMMA), enhance the transfer of energy to the triplet state of the dopant. Production of these transients enables a strong, induced, phosphorescence to occur even at room temperature. This is inhibited by the use of a radical scavenger or the presence of oxygen, which results in reduction of the phosphorescence intensity in the post-irradiation period. E.s.r. analysis of u.v. and X-ray irradiated doped PMMA samples, showing induced phosphorescence, identifies such transients as PMMA radicals. The correlation between induced phosphorescence and thermoluminescence, previously reported, is extended by a further correlation between induced phosphorescence and e.s.r. measurements. It is concluded that the PMMA radicals are involved in the induced phosphorescence as well as the thermoluminescence.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(76)90011-2