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Electrical and Optical Studies of the Organic Thin Film Devices Produced by Cluster Beam Deposition Methods

Published online by Cambridge University Press:  21 March 2011

J.Y. Kim ,
E.S. Kim  and
J.-H. Choi
J.Y. Kim
Affiliation:
Department of Chemistry and Center for Electro- and Photo-Responsive Molecules, Korea University, 1, Anam-dong, Seoul 136-701, Korea
E.S. Kim
Affiliation:
Department of Chemistry and Center for Electro- and Photo-Responsive Molecules, Korea University, 1, Anam-dong, Seoul 136-701, Korea
J.-H. Choi
Affiliation:
Department of Chemistry and Center for Electro- and Photo-Responsive Molecules, Korea University, 1, Anam-dong, Seoul 136-701, Korea
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Abstract

The neutral and ionized cluster beam deposition (NCBD and ICBD) methods have been applied to fabricate the new double-layer organic light emitting devices (OLEDs) with the structure of indium-tin-oxide (ITO)-coated glass/spin-coated poly[2-(N-carbazolyl)-5-(2-ethyl-hexyloxy)-1,4-phenylenevinylene] (CzEH-PPV)/8-hydroxyquinoline aluminum (Alq3)/Li:Al. The surface morphology profiles measured by atomic force microscopy (AFM) showed that the cluster beam deposition methods are efficient in producing uniform and smooth film surfaces. Photo- and electro-luminescence (PL, EL) spectroscopies demonstrated that while the new hole transporting medium CzEH-PPV is susceptible to the bombardment of energetic ionized beam, the introduction of the neutral buffer layer significantly improves the device characteristics, i.e., lower threshold and turn-on voltages and higher external quantum efficiency (EQE). In addition, the effect of doping of highly fluorescent dye (DCM) into Alq3 layer showed a complete energy transfer, color-tuning capability and higher EQE compared to the undoped devices.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 667: Symposium G – Luminescence and Luminescent Materials , 2001 , G3.12
Copyright
Copyright © Materials Research Society 2001

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References

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