Electroluminescent Device Having Electroluminescent Compound and Liquid Crystalline Compound

Rifat A.M. Hikmet, Eindhoven University of Technology, Netherlands
David Braun, Eindhoven University of Technology, Netherlands
Aemilianus G.J. Staring, Eindhoven University of Technology, Netherlands
Hermanmus F.M. Schoo, Eindhoven University of Technology, Netherlands
Johan Lub, Eindhoven University of Technology, Netherlands

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NOTE: At the time of publication, the author David Braun was not yet affiliated with Cal Poly.

Abstract

A description is given of an electroluminescent device (1) having an LED structure, which is composed of an active layer (7) of oriented liquid-crystalline and electroluminescent compounds and a transparent positive electrode layer (5) which is preferably made from an electroconductive polymer. By previously rubbing the electrode layer (5) in one direction with a velvet cloth, an orientation is induced in the molecules in the active layer (7), the orientation being frozen by cooling or polymerization. The electroluminescent device (1) emits polarized light whose direction of polarization is parallel to the direction of rubbing.