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학술지 Surface Control of Planarization Layer on Embossed Glass for Light Extraction in OLEDs
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조두희, 신진욱, 문제현, 박승구, 주철웅, 조남성, 허진우, 한준한, 이종희, 추혜용, 이정익
ETRI Journal, v.36 no.5, pp.847-855
한국전자통신연구원 (ETRI)
13VB1100, 에너지 절감을 위한 외광효율이 최대 100% 향상된 OLED용 광추출 기초 원천기술 개발, 이정익
We developed a highly refractive index planarization layer showing a very smooth surface for organic lightemitting diode (OLED) light extraction, and we successfully prepared a highly efficient white OLED device with an embossed nano-structure and highly refractive index planarization layers. White OLEDs act as an internal out-coupling layer. We used a spin-coating method and two types of TiO2solutions for a planarization of the embossed nano-structure on a glass substrate. The first TiO2solution was TiO2sol, which consists of TiO2colloidal particles in an acidic aqueous solution and several organic additives. The second solution was an organic and inorganic hybrid solution of TiO2. The surface roughness (Ra) and refractive index of the TiO2planarization films on a flat glass were 0.4 nm and 2.0 at 550 nm, respectively. The J-V characteristics of the OLED including the embossed nano-structure and the TiO2planarization film were almost the same as those of an OLED with a flat glass, and the luminous efficacy of the aforementioned OLED was enhanced by 34% compared to that of an OLED with a flat glass.
Light extraction, OLED, Out-coupling, Planarization, Refractive index
KSP 제안 키워드
Aqueous solution, Colloidal particles, Coupling layer, Flat glass, Glass substrate, J-V characteristics, Nano-structures, Organic additives, Organic-inorganic, Smooth surface, Surface roughness