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Selective Luminescence Spectroscopy of Poly(p-Phenylene) Thin Films at Room Temperature

Published online by Cambridge University Press:  10 February 2011

M. A. Drobizhev ,
M. N. Sapozhnikov  and
V. M. KobryanskII
M. A. Drobizhev
Affiliation:
Department of Quantum Radiophysics, Lebedev Physics Institute, Russian Academy of Sciences, Moscow, 117924 Russia
M. N. Sapozhnikov
Affiliation:
Department of Quantum Radiophysics, Lebedev Physics Institute, Russian Academy of Sciences, Moscow, 117924 Russia
V. M. KobryanskII
Affiliation:
Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
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Abstract

Selectively excited room-temperature luminescence spectra are reported for thin films of poly(p-phenylene) (PPP) deposited onto quartz substrata. The spectra exhibit a localization threshold in the low-energy tail of the luminescence excitation band at vloc.= 22400 cm−1, 2200 cm−1 below the maximum of the excitation spectrum. Upon laser excitation at Vex < Vloc., the maximum Vem of the luminescence spectrum shifts linearly with Vex due to selective excitation of polymer segments. It was found that there exists the frequency range where the slope of the Vem vs Vex dependence is smaller than unity, which corresponds to our previous model calculations for the case of selective excitation of chromophores through broad phonon bands. At vex > vloc,, the luminescence spectrum is independent of Vex. This behavior can be explained if one assumes that upon excitation below the localization threshold the luminescence is related to polymer segments directly excited by laser, whereas upon exciting above the threshold the fast energy relaxation takes place from initially excited states to lower-lying states, from which uminescence occurs.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 413: Symposium W – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials III , 1995 , 677
Copyright
Copyright © Materials Research Society 1996

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