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Proceedings Paper

Poly(p-phenyleneacetylene)-based light-emitting diodes
Author(s): Leland S. Swanson; F. Lu; Joseph Shinar; Yi Wei Ding; Thomas J. Barton
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Paper Abstract

A study of poly(p-phenyleneacetylene) (PPA)-based light-emitting diodes (LEDs) is described and discussed. The LEDs were fabricated by spin-coating the indium tin oxide (ITO) coated glass substrate with the 2,5-dibutoxy or 2,5-dihexoxy derivative of PPA dissolved in toluene, followed by evaporation of a layer of Ca and Al or Al only on the polymer. As the spin- coating, drying, and operation of the diodes was performed in air with no heat sink, the Ca/Al devices degraded within a few minutes at room temperature, but were stable in a He ambient at low temperatures. However, it was noted that baking the diodes coated with an Al layer for 2 - 6 hours at 150 degree(s)C in a flow of dry N2 markedly increased their performance. However, no improvement was achieved by baking the polymer laser prior to metallization. It is therefore believed that the baking process removes significant defects from the polymer/metal interface. The nature of these results is discussed in terms of bulk defects as well as defects at the ITO/polymer and polymer/metal interfaces.

Paper Details

Date Published: 27 August 1993
PDF: 10 pages
Proc. SPIE 1910, Electroluminescent Materials, Devices, and Large-Screen Displays, (27 August 1993); doi: 10.1117/12.151137
Show Author Affiliations
Leland S. Swanson, Ames Lab./USDOE and Iowa State Univ. (United States)
F. Lu, Ames Lab./USDOE and Iowa State Univ. (United States)
Joseph Shinar, Ames Lab./USDOE and Iowa State Univ. (United States)
Yi Wei Ding, Ames Lab./USDOE and Iowa State Univ. (United States)
Thomas J. Barton, Ames Lab./USDOE and Iowa State 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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