Electrode/organic layer interfaces in organic LEDs

Joseph Shinar; Haiying Tang; F. Li

doi:10.1117/12.295546

1 December 1997 Electrode/organic layer interfaces in organic LEDs

Joseph Shinar, Haiying Tang, F. Li

Proceedings Volume 3148, Organic Light-Emitting Materials and Devices; (1997) https://doi.org/10.1117/12.295546
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The effects of (i) aquaregia-treatment of the indium tin oxide (ITO) substrate anode and (ii) a controlled Al₂O₃ buffer between the emitting layer (EML) and the Al cathode layer on the behavior of efficient vacuum evaporated multilayer organic light-emitting diodes (LEDs) is described. The organic layers include hole transporting layers (HTLs) such as '3-armed star' 4,4',4"- tris(N-(3-methoxyphenyl)-N-phenylamine-triphenylamine) and triphenyl diamine, and the EMLs consist either of green- emitting 8-tris-hydroxyquinoline aluminum (Alq₃) or blue-emitting amino oxadiazole fluorene. While the aquaregia treatment enhances the performance, the optimized treatment depends on the HTL. This observation implies that the enhancement is due not only to contact area effects. Similarly, an Al₂O₃ layer of suitable thickness also enhances the current injection and EL output significantly. This enhancement is believed to be due to increased charge carrier density near the HTL/EML interface which results from removal of the intrinsic organic/Al interface gap states which trap injected carriers and quench singlet excitons nonradiatively.

Citation Download Citation

Joseph Shinar, Haiying Tang, and F. Li "Electrode/organic layer interfaces in organic LEDs", Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); https://doi.org/10.1117/12.295546

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