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Proceedings Paper

Organic light-emitting diodes based on bicarbazyles
Author(s): Wolfgang S. Bacsa; Michel Schaer; D. Ades; A. Siove; Libero Zuppiroli
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Paper Abstract

Bicarbazyle's are stable and small organic molecules with external quantum yields of 0.1 percent in single layer devices. Devices from (EtCz)2 emit in the violet-blue spectral region. Multilayer configuration with transport layers show a significant higher brightness and quantum efficiency and addition of (OcCz COOH)2, improves the device stability. We find that the current voltage characteristics of (EtCz)2 is well described by our recent microscopic model for space charge limited currents in an assembly of conjugated polymer segments. Although the applicability of the polaron concept to small molecules is somewhat questionable, the excellent result obtained with the model reveal the importance of molecular relaxation processes during the jump of the carrier.

Paper Details

Date Published: 16 December 1998
PDF: 9 pages
Proc. SPIE 3476, Organic Light-Emitting Materials and Devices II, (16 December 1998); doi: 10.1117/12.332624
Show Author Affiliations
Wolfgang S. Bacsa, Swiss Federal Institute of Technology (Switzerland)
Michel Schaer, Swiss Federal Institute of Technology (Switzerland)
D. Ades, Univ. de Paris-Nord (France)
A. Siove, Univ. de Paris-Nord (France)
Libero Zuppiroli, Swiss Federal Institute of Technology (Switzerland)

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

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