Institute for Scintillating Materials NAN of Ukraine

Kharkiv, Ukraine

Institute for Scintillating Materials NAN of Ukraine

Kharkiv, Ukraine

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Adadurov A.F.,Institute for Scintillating Materials NAN of Ukraine | Gurkalenko Y.A.,Institute for Scintillating Materials NAN of Ukraine | Zhmurin P.N.,Institute for Scintillating Materials NAN of Ukraine
Journal of Fluorescence | Year: 2010

New bifluorophore containing pyrene as an excitation energy donor and naphtylamide as an acceptor is synthesized and its optical properties are studied. It is founded that excitation spectrum of the bifluorophore is almost the sum of its constituents-pyrene and naftylamide. At the same time, in the luminescence spectrum there only the peak of acceptor luminescence is observed, which indicates the effective radiationless energy transfer from the donor to the acceptor. This is also proved by time resolved measurements of bifluorophore decay. The decay rate was calculated from decay curve and appear to be 0.25 hc -1. The same value obtained from the Förster's theory is almost by an order as high. It indicates that Förster's does not applicable in this particular case. Instead, we have to use the electron excitation density functions approach. © 2009 Springer Science+Business Media, LLC.


Adadurov A.F.,Institute for Scintillating Materials NAN of Ukraine | Yelyseev D.A.,Institute for Scintillating Materials NAN of Ukraine | Titskaya V.D.,Institute for Scintillating Materials NAN of Ukraine | Lebedev V.N.,Institute for Scintillating Materials NAN of Ukraine | Zhmurin P.N.,Institute for Scintillating Materials NAN of Ukraine
Radiation Measurements | Year: 2011

Plastic scintillators (PS) were made based on benzyl methacrylate and methyl-methacrylate P(BzMA + MMA) copolymer in which the excimer forming rate is by two order lesser than that in polystyrene-based polymer matrix. Studying of these PS light yield demonstrates the importance of migration processes comparing to excimer formation. It is found that to obtain PS with high scintillation efficiency it is necessary to use the polymer base (matrix) in which excimer forming is eliminated but the migration process along the chromophores is maximally favored. To explain the accelerated energy transfer between phenyl chromophores it is proposed to use a mechanism of exchange of that virtual excitons that can propagate along a one-dimensional back-bone of polymer molecule. Clearing the details of mechanism of interaction between chromophores of polymer molecules which is responsible for accelerated radiationless energy transfer enable will determine in future the way of effective plastic scintillators designing. © 2011 Elsevier Ltd. All rights reserved.


PubMed | Institute for scintillating materials NAN of Ukraine
Type: Journal Article | Journal: Journal of fluorescence | Year: 2010

New bifluorophore containing pyrene as an excitation energy donor and naphtylamide as an acceptor is synthesized and its optical properties are studied. It is founded that excitation spectrum of the bifluorophore is almost the sum of its constituents--pyrene and naftylamide. At the same time, in the luminescence spectrum there only the peak of acceptor luminescence is observed, which indicates the effective radiationless energy transfer from the donor to the acceptor. This is also proved by time resolved measurements of bifluorophore decay. The decay rate was calculated from decay curve and appear to be 0.25 HC(-1). The same value obtained from the Frsters theory is almost by an order as high. It indicates that Frsters does not applicable in this particular case. Instead, we have to use the electron excitation density functions approach.

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