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Proceedings Paper

Organic light-emitting diodes using spherical aggregates
Author(s): Chihaya Adachi; Seiji Hibino; Asuka Yamamori; Masahiro Uchida; Toshiki Koyama; Yoshio Taniguchi
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Paper Abstract

We have succeeded in fabricating submicrometer-sized organic light emitting diodes (OLED) with bright emission using a polymer blend. The cell structure was composed of ITO/hole transport layer(polymer blend layer)/emitting layer/MgAg. We used poly (methyl methacrylate) (PMMA) as an inert host material and N,N'-diphenyl-N,N'-bias(3- methylphenyl)-(1,1'-biphenyl)-4,4'-diamine- polycarbonate (PC-TPD) as a guest material. The polymer blend layers showed various morphology depending on the concentration of PC-TPD. With 2 wt percent of PC-TPD, and PC-TPD formed submicrometer-sized spherical domains, actually prolate spheroids, in the PMMA host layer. The domain diameters were around 200 nm according to AFM and SEM observations. The OLED including such a blend structure showed aggregation of bright submicrometer-sized electroluminescence spots. The number of working diodes exceeded four million per square centimeter.

Paper Details

Date Published: 1 December 1997
PDF: 8 pages
Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); doi: 10.1117/12.279347
Show Author Affiliations
Chihaya Adachi, Shinshu Univ. (Japan)
Seiji Hibino, Shinshu Univ. (Japan)
Asuka Yamamori, Shinshu Univ. (Japan)
Masahiro Uchida, Shinshu Univ. (Japan)
Toshiki Koyama, Shinshu Univ. (Japan)
Yoshio Taniguchi, Shinshu Univ. (Japan)

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

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