Vinylene-bridged triphenylamine dimers as an emitting material in trilayer organic electroluminescent devices

S. Pfeiffer; Hans-Heinrich Hoerhold; H. Boerner; Hans Nikol; W. Busselt

doi:10.1117/12.332598

16 December 1998 Vinylene-bridged triphenylamine dimers as an emitting material in trilayer organic electroluminescent devices

S. Pfeiffer, Hans-Heinrich Hoerhold, H. Boerner, Hans Nikol, W. Busselt

Author Affiliations +

Proceedings Volume 3476, Organic Light-Emitting Materials and Devices II; (1998) https://doi.org/10.1117/12.332598
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

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.

Citation Download Citation

S. Pfeiffer, Hans-Heinrich Hoerhold, H. Boerner, Hans Nikol, and W. Busselt "Vinylene-bridged triphenylamine dimers as an emitting material in trilayer organic electroluminescent devices", Proc. SPIE 3476, Organic Light-Emitting Materials and Devices II, (16 December 1998); https://doi.org/10.1117/12.332598

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