Poly(p-phenyleneacetylene)-based light-emitting diodes

Leland S. Swanson; F. Lu; Joseph Shinar; Yi Wei Ding; Thomas J. Barton

doi:10.1117/12.151137

27 August 1993 Poly(p-phenyleneacetylene)-based light-emitting diodes

Leland S. Swanson, F. Lu, Joseph Shinar, Yi Wei Ding, Thomas J. Barton

Proceedings Volume 1910, Electroluminescent Materials, Devices, and Large-Screen Displays; (1993) https://doi.org/10.1117/12.151137
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1993, San Jose, CA, United States

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.

Citation Download Citation

Leland S. Swanson, F. Lu, Joseph Shinar, Yi Wei Ding, and Thomas J. Barton "Poly(p-phenyleneacetylene)-based light-emitting diodes", Proc. SPIE 1910, Electroluminescent Materials, Devices, and Large-Screen Displays, (27 August 1993); https://doi.org/10.1117/12.151137

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