Metasurface Micro-Cavity for OLED Color Purity

Researchers at Stanford have developed a simpler and low-cost micro-cavity design for color tuning of organic light emitting devices (OLEDs) for display applications. A micro-cavity is an essential part of OLED display for high color purity. White OLED for large display (e.g., TV) uses a micro-cavity with controlled ITO layers, which can work well but is complicated and high cost. A simpler structure and easier fabrication methods would be advantageous. In the new design, the resonance wavelength of the micro-cavity is determined by the phase delay of a meta-mirror back electrode. The phase delay can be controlled by depth and/or width of a phase modulation surface featuring a nano-sized hole array.

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