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Carrier Transport Dependence on Phosphorescent Materials in Polymer Based OLEDs

Published online by Cambridge University Press:  14 February 2012

Genichi Motomura ,
Mitsunori Suzuki ,
Takahisa Shimizu  and
Hideo Fujikake
Genichi Motomura
Affiliation:
NHK Science & Technology Research Laboratories, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157–8510, Japan
Mitsunori Suzuki
Affiliation:
NHK Science & Technology Research Laboratories, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157–8510, Japan
Takahisa Shimizu
Affiliation:
NHK Science & Technology Research Laboratories, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157–8510, Japan
Hideo Fujikake
Affiliation:
NHK Science & Technology Research Laboratories, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157–8510, Japan
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Abstract

The carrier transport properties in the emissive layer of phosphorescent polymer organic light-emitting diodes (OLEDs) were observed by time-of-flight (TOF) mobility measurements. The hole and electron mobilities in carrier transport polymer without iridium complexes were measured with high levels, 3 × 10-4 cm2/Vs (hole) and 1 × 10-3 cm2/Vs (electron), of non-dispersive transport. The hole and/or electron transport properties were degraded when the iridium complexes were included in the phosphorescent polymers. The complexes acted as a trap in the phosphorescent polymers when the energy levels of the iridium complexes were lower than that of the carrier transport polymer.

Keywords

organictransportationpolymer
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1402: Symposium U – Charge Generation/Transport in Organic Semiconductor Materials , 2012 , mrsf11-1402-u08-37
Copyright
Copyright © Materials Research Society 2012

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References

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