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Proceedings Paper

Organic electroluminescent devices with polymeric materials
Author(s): Junji Kido; Masafumi Kohda; Katsuro Okuyama; Katsutoshi Nagai; Yoshiyuki Okamoto
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Paper Abstract

Electroluminescent devices with double organic layers were fabricated using polymeric materials as the hole transport layer and tris(8-quinolinolato)aluminum(III) complex (Alq) as the emitting layer, respectively. The polymeric materials used are poly(methylphenylsilane), plasma-polymerized carbon disulfide, and polycarbonate (TPD). A cell structure of glass substrate/indium-tin-oxide (ITO)/polymer layer/Alq/Mg:Ag (10:1) or Mg/Ag was employed. Among the polymeric systems, the doped PC system affords efficient electroluminescence from the Alq layer. In this cell, bright green emission with luminance of 7,700 cd/m2 was observed at a drive voltage of 16 V. Single-layer-type EL devices were also fabricated using poly(methyl methacrylate) (PMMA) molecularly doped with both TPD and Alq. A cell structure of glass substrate/ITO/doped PMMA/Mg:Ag (10:1) was employed. Green emission with luminance of 920 cd/m2 was achieved for a cell with a TPD/Alq ratio of 0.67 at a drive voltage of 17 V, and the EL color was tuned to blue-green and yellow-orange by further doping the PMMA layer with suitable organic dyes.

Paper Details

Date Published: 27 August 1993
PDF: 7 pages
Proc. SPIE 1910, Electroluminescent Materials, Devices, and Large-Screen Displays, (27 August 1993); doi: 10.1117/12.151166
Show Author Affiliations
Junji Kido, Yamagata Univ. (Japan)
Masafumi Kohda, Yamagata Univ. (Japan)
Katsuro Okuyama, Yamagata Univ. (Japan)
Katsutoshi Nagai, Yamagata Univ. (Japan)
Yoshiyuki Okamoto, Polytechnic Univ. (United States)

Published in SPIE Proceedings Vol. 1910:
Electroluminescent Materials, Devices, and Large-Screen Displays
Esther M. Conwell; Milan Stolka; M. Robert Miller, Editor(s)

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