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Silole Derivatives with a High and Non-dispersive Electron Mobility, and a 100 % Photoluminescence Quantum Efficiency

Published online by Cambridge University Press:  21 March 2011

H. Murata ,
G. G. Malliaras ,
M. Uchida ,
Y. Shen  and
Z. H. Kafafi
H. Murata
Affiliation:
Optical Sciences Division, US Naval Research Laboratory, Washington, DC 20375, U.S.A Department of Chemistry, Centre for Electronic Materials and Devices Imperial College of Science, Technology and Medicine, London SW7 2AY, UK
G. G. Malliaras
Affiliation:
Department of Material Science and Engineering, Cornell University, Ithaca, NY 14853, U.S.A
M. Uchida
Affiliation:
Chisso Corporation, Yokohama, Kanagawa 236-8605, Japan
Y. Shen
Affiliation:
Department of Material Science and Engineering, Cornell University, Ithaca, NY 14853, U.S.A
Z. H. Kafafi
Affiliation:
Optical Sciences Division, US Naval Research Laboratory, Washington, DC 20375, U.S.A
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Abstract

Non-dispersive and fast electron transport was realized for an amorphous, vapor deposited film of 2,5-bis(2',2''-bipyridin-6-yl)-1,1-dimethyl-3,4-diphenylsilacyclopentadiene in ambient and inert atmospheres. An electron mobility of 2×10−4 cm2/Vs was measured by time-of-flight at an electric field of 6×105 V/cm. This mobility is more than two orders of magnitude larger than that of the most widely used electron transporter, tris(quinolin-8-olato) aluminum (III), in molecular organic light-emitting devices (MOLEDs). Another silole derivative, namely 1,2-bis (1-methyl-2,3,4,5,-tetraphenylsilacyclopentadienyl)ethane, exhibits bright fluorescent blue-green light with an absolute quantum yield close to 100 % in the solid state. MOLEDs composed of stacked neat films of these two silole derivatives and a hole transporter show a significantly low operating voltage and an external quantum efficiency of 4.8 %, close to the theoretical limit.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 665: Symposium C – Electronic, Optical and Optoelectronic Polymers and Oligomers , 2001 , C6.3
Copyright
Copyright © Materials Research Society 2001

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