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Low Driving Voltage of Organic Light-Emitting Diodes Using p-Doping Starburst Amine as Hole Transporter

Published online by Cambridge University Press:  21 March 2011

Xiang Zhou ,
Andreas Nollau ,
Jan Blochwitz ,
Martin Pfeiffer ,
Torsten Fritz  and
Karl Leo
Xiang Zhou
Affiliation:
Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany
Andreas Nollau
Affiliation:
Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany
Jan Blochwitz
Affiliation:
Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany
Martin Pfeiffer
Affiliation:
Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany
Torsten Fritz
Affiliation:
Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany
Karl Leo
Affiliation:
Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany
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Abstract

We investigate the electrical properties and the OLED application of controlledly doped amorphous hole transporters. Thin films of starburst amine, 4,4',4“-tris(N,N-diphenyl- amino) triphenylamine (TDATA), doped by a fully fluorinated form of tetracyano- quinodimethane (F4-TCNQ), are characterized in situ by temperature dependent conductivity and Seebeck measurements. The conductivity and hole concentration increase with dopant concentration and are many orders of magnitude higher than those of undoped material. OLED devices with the layer sequence ITO/TDATA(200 nm)/Alq3(65 nm)/LiF(1 nm)/Al were fabricated. The use of p-doped TDATA thin films with high bulk conductivity and hole concentration reduces the resistance of the devices and leads to a thinner space charge layer which facilitates injection of holes from the ITO anode.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 660: Symposia JJ – Organic Electronic & Photonic Materials and Devices , 2000 , JJ5.23
Copyright
Copyright © Materials Research Society 2001

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References

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