Soft holographic interference lithography microlens for enhanced organic light emitting diode light extraction.
作者： Joong-Mok Park , Zhengqing Gan , Wai Y. Leung , Rui Liu , Zhuo Ye
DOI: 10.1364/OE.19.00A786
关键词: Optoelectronics 、 Soft lithography 、 Microlens 、 Polydimethylsiloxane 、 Photoresist 、 Electroluminescence 、 OLED 、 Interference lithography 、 Optics 、 Materials science 、 Light-emitting diode
摘要: Very uniform 2 μm-pitch square microlens arrays (μLAs), embossed on the blank glass side of an indium-tin-oxide (ITO)-coated 1.1 mm-thick glass, are used to enhance light extraction from organic light-emitting diodes (OLEDs) by ~100%, significantly higher than enhancements reported previously. The array design and size relative OLED pixel appear be responsible for this enhancement. fabricated very economical soft lithography imprinting a polydimethylsiloxane (PDMS) mold (itself obtained Ni master stamp that is generated holographic interference photoresist) UV-curable polyurethane drop placed glass. Green blue OLEDs then ITO complete device. When μLA ~15 × 15 mm(2), i.e., much larger ~3 3 mm(2) pixel, electroluminescence (EL) in forward direction enhanced ~100%. Similarly, 19 25 enhances EL extracted pixels 96%. Simulations include effects absorption layers accordance with experimental results indicate thinner 0.7 mm thick would yield ~140%
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