Increased OLED radiative efficiency using a directive optical antenna.
We investigate the improvement in efficiency of organic light emitting diodes/displays (OLEDs) by embedding a typical OLED structure within a metallic patch grating resonator. A patch grating resonator is similar to the more familiar Fabry-Perot resonator, except that one mirror of the resonator is a metallic patch grating with a pitch approximately lambda /2 that reduces lateral propagation of radiative emission. FDTD simulations of the proposed structure indicate a potential 71% increase in emitted power over that of a reference OLED structure, and an additional 5% gain from adding an ITO spacer adjacent to the metallic electrode layer (for a total 76% increase). Implementation of this structure requires little to no modification of the OLED manufacturing process.
McDaniel
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1University of Utah, Department of Electrical and Computer Engineering Salt Lake City, UT 84112, USA. steve.mcdaniel@utah.edu
Blair
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D004566:Electrodes; D004867:Equipment Design; D008027:Light; D008029:Lighting / Q000295:instrumentation*; D012666:Semiconductors