The light extraction factor of 18% in planar OLED is predicted by classical ray optics model.The optical losses are mainly from the waveguiding effect-edge emission of waveguided modes.

• 利用几何光学模型计算了OLED典型结构的外发光效率，结果表明仅有18%25的光成为外输出光，主要的光损失来自OLED器件内的光波导效应。