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Concentration Dependence of Photoluminescence and Electroluminescence in 2,5 Bis[2'-(4”-Hydroxyhexanol Benzyl)-l'-Ethyl]3,4-Dibutyl Thiophenes

Published online by Cambridge University Press:  10 February 2011

S. Blumstengel ,
I. Sokolik ,
R. Dorsinville ,
D. Voloschenko ,
M. He ,
L.-C. Chien  and
O. Lavrentovich
S. Blumstengel
Affiliation:
Department of Electrical Engineering, City College of the City University of New York, 138th Street and Convent Ave., New York, NY 10031
I. Sokolik
Affiliation:
Department of Electrical Engineering, City College of the City University of New York, 138th Street and Convent Ave., New York, NY 10031
R. Dorsinville
Affiliation:
Department of Electrical Engineering, City College of the City University of New York, 138th Street and Convent Ave., New York, NY 10031 New York State Center for Advanced Technology for Ultrafast Materials and Application at CUNY and Center for Analysis of Structure and Interfaces, The City College and Graduate Center of CUNY
D. Voloschenko
Affiliation:
Kent State University, Liquid Crystal Institute and Chemical Physics Program, Kent, OH
M. He
Affiliation:
New York State Center for Advanced Technology for Ultrafast Materials and Application at CUNY and Center for Analysis of Structure and Interfaces, The City College and Graduate Center of CUNY
L.-C. Chien
Affiliation:
Kent State University, Liquid Crystal Institute and Chemical Physics Program, Kent, OH
O. Lavrentovich
Affiliation:
Kent State University, Liquid Crystal Institute and Chemical Physics Program, Kent, OH
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Abstract

A new thiophene-based compound 2,5 bis[2'-(4”-hydroxyhexanol benzyl)-l'-ethyl]3,4-dibutyl thiophene (HBDT) as well as a copolymer (HBDT-PU) consisting of alternating HBDT and urethane spacer units were synthesized. Absorption and luminescence properties of both compounds were studied in solution and in different polymer matrices. Absorption and luminescence spectra of HBDT and HBDT-PU coincide indicating that emission in HBDT-PU occurs from the thiopene containing unit. Photoluminescence (PL) is emitted in the blue-green region of the visible spectrum with a maximum at 460 nm. The PL efficiency of both compounds is strongly enhanced when dispersed in a PVK or PMMA matrix indicating that concentration quenching occurs in the pure material. Light emitting devices were fabricated utilizing a PVK/PBD blend doped with HBDT and HBDT-PU at different concentrations as emitter material. The electroluminescence (EL) spectra coincided with the PL spectra of HBDT indicating that EL emission originates from the dopant molecules. The dependence of the EL efficiency on the doping concentration was measured and found to be close to the concentration dependence of the PL quantum yield.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 557
Copyright
Copyright © Materials Research Society 1998

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