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Plastic Multilayered Molecular Organic Light Emitting Diodes

Published online by Cambridge University Press:  10 February 2011

George M. Daly ,
Hideyuki Murata ,
Charles D. Merritt ,
Zakya H. Kafafi ,
Hiroshi Inada  and
Yasuhiko Shirota
George M. Daly
Affiliation:
United States Naval Research LaboratoryWashington, DC 20375
Hideyuki Murata
Affiliation:
United States Naval Research LaboratoryWashington, DC 20375
Charles D. Merritt
Affiliation:
United States Naval Research LaboratoryWashington, DC 20375
Zakya H. Kafafi*
Affiliation:
United States Naval Research LaboratoryWashington, DC 20375
Hiroshi Inada
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Osaka University, Yamadaoka, Suita, Osaka 565, Japan
Yasuhiko Shirota
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Osaka University, Yamadaoka, Suita, Osaka 565, Japan
*
*Author to whom correspondence should be addressed.
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Abstract

Enhanced performance has been observed for plastic molecular organic light emitting diodes (MOLEDs) consisting of two to four organic layers sequentially vacuum vapor deposited onto patterned indium-tin oxide (ITO) on polyester films. For all device structures studied, the performance of plastic diodes is comparable to or better than their analogs on glass substrates. At 100 A/m2, a luminous power efficiency of 4.4 lm/W and external quantum yield of 2.7% are measured for a device structure consisting of two hole transport layers, a doped emitting layer and an electron transport layer on a polyester substrate. The same device made on a silica substrate has a luminous power efficiency of 3.5 lm/W and external quantum yield of 2.3%. Electrical and optical performance for comparable device structures has been characterized by current-voltage-luminance measurements and electroluminescence spectra collected normal to the emitting surface. In addition, an integrating sphere was used to collect the total light emitted and to determine the optical output coupling on glass versus plastic substrates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 33
Copyright
Copyright © Materials Research Society 1998

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Footnotes

†

American Society for Engineering Education Postdoctoral Fellow

‡

Sachs Freeman Associates, Inc., Largo MD 20774

References

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