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Proceedings Paper

Electrode/organic layer interfaces in organic LEDs
Author(s): Joseph Shinar; Haiying Tang; F. Li
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Paper 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.

Paper Details

Date Published: 1 December 1997
PDF: 12 pages
Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); doi: 10.1117/12.295546
Show Author Affiliations
Joseph Shinar, Iowa State Univ. (United States)
Haiying Tang, Iowa State Univ. (United States)
F. Li, Iowa State Univ. (United States)

Published in SPIE Proceedings Vol. 3148:
Organic Light-Emitting Materials and Devices
Zakya H. Kafafi, Editor(s)

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