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Efficient blue-green molecular organic light emitting diodes based on novel silole derivatives

Published online by Cambridge University Press:  01 February 2011

Leonidas C. Palilis ,
Hideyuki Murata ,
Antti J. Mäkinen ,
Manabu Uchida  and
Zakya H. Kafafia
Leonidas C. Palilis*
Affiliation:
Optical Sciences Division, U.S. Naval Research Laboratory, Washington, DC 20375
Hideyuki Murata
Affiliation:
School of Materials Science, Japan Advanced Institute of Science Technology, Ishikawa 923-1292, Japan
Antti J. Mäkinen
Affiliation:
Optical Sciences Division, U.S. Naval Research Laboratory, Washington, DC 20375
Manabu Uchida
Affiliation:
Chisso Corporation, Yokohama, Kanagawa 236-8605, Japan
Zakya H. Kafafia
Affiliation:
Optical Sciences Division, U.S. Naval Research Laboratory, Washington, DC 20375
*
*Corresponding author: kafafi@ccf.nrl.navy.mil
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Abstract

We report on highly efficient molecular organic light-emitting diodes (MOLEDs) using two novel silole derivatives as emissive and electron transport materials. A silole derivative, namely 2,5-di-(3-biphenyl)-1,1-dimethyl-3,4-diphenylsilacyclopentadiene (PPSPP), which shows blue fluorescence with a high photoluminescence quantum yield of 85% in the solid state, was used as the emissive material. Another silole derivative, namely 2,5-bis-(2‘2“-bipyridin-6-yl)-1,1- dimethyl-3,4-diphenylsilacyclopentadiene (PyPySPyPy), that exhibits a non-dispersive high electron mobility of 2x10-4 cm2/Vsec was used as the electron transport material. MOLEDs using these two siloles and a common hole transport material show blue-green emission centered at 495 nm. This red-shifted electroluminescence (EL) band relative to the blue fluorescence of PPSPP is assigned to a PPSPP:NPB exciplex. A low operating voltage of 4.5 V was measured at a luminance of 100 cd/m2 and an EL quantum efficiency of 3.4% was achieved at 100 A/m2. To our knowledge, this is the highest EL quantum efficiency ever reported based on exciplex emission.

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Footnotes

†

Also at SFA Inc., Largo, MD 20774; electronic mail: leonidas@ccs.nrl.navy.mil

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