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Electron Injection Effects in Electroluminescent Devices Using Polymer Blend Thin Films

Published online by Cambridge University Press:  10 February 2011

C. C. Wu ,
J. C. Sturm ,
R. A. Register ,
L. Suponeva  and
M. E. Thompson
C. C. Wu
Affiliation:
Advanced Technology Center for Photonic and Optoelectronic Materials (ATC/POEM) Princeton University, NJ 08544
J. C. Sturm
Affiliation:
Advanced Technology Center for Photonic and Optoelectronic Materials (ATC/POEM) Princeton University, NJ 08544
R. A. Register
Affiliation:
Advanced Technology Center for Photonic and Optoelectronic Materials (ATC/POEM) Princeton University, NJ 08544
L. Suponeva
Affiliation:
Department of Chemistry, University of Southern California, Los Angeles, CA 90089
M. E. Thompson
Affiliation:
Department of Chemistry, University of Southern California, Los Angeles, CA 90089
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Abstract

In this paper, we discuss the effects of electron injection on electroluminescence (EL) efficiency in single-layer EL devices using blends of poly(N-vinylcarbazole) (PVK) and poly(3-nbutyl- p-pyridyl vinylene) (Bu-PPyV). Pure Bu-PPyV thin films suffer from formation of excimers due to the strong interchain interaction. Diluting Bu-PPyV with the high-energy-gap and holetransporting polymer PVK suppresses excimer formation and substantially raises both photoluminescence (PL) and EL efficiencies. The emission color is converted from red to green, indicating a transition from excimer emission to monomer emission of Bu-PPyV. The electron injection and EL efficiency can be fluther improved by adding small-molecule oxadiazoles into the blends as electron-transport materials. In optimized devices, an external EL quantum efficiency (backside emission only) as high as 0.8% photon/electron and practical brightnesses of 100 cd/m2 and 1000 cd/m2 can be achieved at ∼9V and ∼13.5V, respectively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 424: Symposium H – Flat Panel Display Materials II , 1996 , 489
Copyright
Copyright © Materials Research Society 1997

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