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Proceedings Paper

Vinylene-bridged triphenylamine dimers as an emitting material in trilayer organic electroluminescent devices
Author(s): S. Pfeiffer; Hans-Heinrich Hoerhold; H. Boerner; Hans Nikol; W. Busselt
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Paper Abstract

This paper reports the synthesis as well as electrochemical and optical characterization of six highly luminescent TPA- based molecules, TPA-X-TPA, where X represent the vinylene and vinylene-arylene-vinylene units and examines their use as the light-emitting dopant of a composite emission layer in trilayer OLEDs. The device configuration ITO/HTL/EML/ETL/Ca/Al is based on a double heterostructure, where HTL is the hole-transport layer, ETL is the electron- transport layer, and EML is a composite film of the TPA-X- TPA dopant dispersed in an ET matrix. This composite EML is prepared by a vacuum codeposition technique. A variety of TPA-X-TPA doped OLEDs were fabricated and characterized by EL spectra and luminous efficiencies. We found that the EL- emission arise from the dopant molecule, blue EL was obtained with a luminous efficiency of 0.3 1m/W and a luminance of 50 cd/m2 at 7V device voltage. In comparison with 1,4-bis(4'-diphenylamino-styryl)-2,5- dimethoxybenzene as the dopant molecule strong green EL was observed.

Paper Details

Date Published: 16 December 1998
PDF: 9 pages
Proc. SPIE 3476, Organic Light-Emitting Materials and Devices II, (16 December 1998); doi: 10.1117/12.332598
Show Author Affiliations
S. Pfeiffer, Friedrich-Schiller-Univ. Jena (Germany)
Hans-Heinrich Hoerhold, Friedrich-Schiller-Univ. Jena (Germany)
H. Boerner, Philips GmbH Forschungslab. Aachen (Germany)
Hans Nikol, Philips GmbH Forschungslab. Aachen (Germany)
W. Busselt, Philips GmbH Forschungslab. Aachen (Germany)

Published in SPIE Proceedings Vol. 3476:
Organic Light-Emitting Materials and Devices II
Zakya H. Kafafi, Editor(s)

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