Organic light-emitting diodes based on bicarbazyles

Wolfgang S. Bacsa; Michel Schaer; D. Ades; A. Siove; Libero Zuppiroli

doi:10.1117/12.332624

16 December 1998 Organic light-emitting diodes based on bicarbazyles

Wolfgang S. Bacsa, Michel Schaer, D. Ades, A. Siove, Libero Zuppiroli

Proceedings Volume 3476, Organic Light-Emitting Materials and Devices II; (1998) https://doi.org/10.1117/12.332624
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

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.

Citation Download Citation

Wolfgang S. Bacsa, Michel Schaer, D. Ades, A. Siove, and Libero Zuppiroli "Organic light-emitting diodes based on bicarbazyles", Proc. SPIE 3476, Organic Light-Emitting Materials and Devices II, (16 December 1998); https://doi.org/10.1117/12.332624

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