2015 年 28 巻 3 号 p. 329-334
Novel nano-structure for the improved light extraction efficiency of reduced evanescent mode OLED devices (REM OLED) was developed. The nano-structure was designed to have high transmittance especially over critical angle in order to achieve good combination with the light distribution pattern of the REM OLED devices. In this system, the wide angular substrate mode was efficiently converted into the external mode, and high efficacy green OLED with EQE of 54 % was obtained. Relative light extraction efficiency to a hemisphere lens system was 89 %.