Low Operational Voltage of Organic Electroluminescent Devices with a High Bipolar Conducting Silole Derivative

15 November 2002

journal article
Published by IOP Publishing in Japanese Journal of Applied Physics

Vol. 41 (Part 1, No) , 6582-6585
https://doi.org/10.1143/jjap.41.6582

Abstract

We have measured electron and hole mobilities in vacuum-deposited film of 2,5-bis(6^'-(2^',2^''-bipyridyl))-1,1-dimethyl-3,4-diphenylsilole (PyPySPyPy) using a time-of-flight technique. The PyPySPyPy has a bipolar transport property and both its electron and hole mobilities are over 10^-4 cm²/Vs. Multilayered organic electroluminescent (EL) devices consisting of N, N^'-diphenyl-N, N^'-(3-methylphenyl)-[1,1^'-biphenyl]-4,4^'-diamine (TPD) as a hole transport layer, tris (8-quinolinolato) aluminum (III) (Alq₃) as an emitting layer, and PyPySPyPy as an electron transport layer exhibit a very low operational voltage of 3.6 V for obtaining 1,000 cd/m². The Schottky barrier height at the PyPySPyPy/Al interface was 0.59 eV, and the value was obviously smaller than that in the case of the Alq₃/Al interface.

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