Roll-to-roll 적용 가능한 마이크로 응집 구조를 갖는 EVA/SiO2 복합 필름의 산란 특성
The Scattering Property of EVA/SiO2 Composite Film Formed Micro-aggregation Structure for Roll-to-roll Process
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We fabricated high transmission and high scattering poly(ethylene-co-vinyl acetate)(EVA) films embedding SiO2 nanoparticles to improve outcoupling efficiency in organic display. The 800nm diameter SiO2 nanoparticles aggregated and formed 1.56㎛ (with ±0.853㎛ standard deviation) diameter microparticles in EVA. The total transmission of scattering film was 83.3% on Polyethylene terephthalate(PET), which was higher than reference 82.8% PET substrate. The diffuse transmission and haze of the SiO2 embedded EVA film were 76.1% and 91.4%, respectively. The optimized condition was 1:1 weight ratio of SiO2 nanoparticles to EVA in Tetrahydrofuran(THF) solution. When the ratio of SiO2 was larger than 1, the total transmission decreased by the increase in backscattering of light due to high scattering. With the optimized condition, we could succeed to fabricate a large scale film(35m in length) with a roll-to-roll process.
Abstract
We fabricated high transmission and high scattering poly(ethylene-co-vinyl acetate)(EVA) films embedding SiO2 nanoparticles to improve outcoupling efficiency in organic display. The 800nm diameter SiO2 nanoparticles aggregated and formed 1.56㎛ (with ±0.853㎛ standard deviation) diameter microparticles in EVA. The total transmission of scattering film was 83.3% on Polyethylene terephthalate(PET), which was higher than reference 82.8% PET substrate. The diffuse transmission and haze of the SiO2 embedded EVA film were 76.1% and 91.4%, respectively. The optimized condition was 1:1 weight ratio of SiO2 nanoparticles to EVA in Tetrahydrofuran(THF) solution. When the ratio of SiO2 was larger than 1, the total transmission decreased by the increase in backscattering of light due to high scattering. With the optimized condition, we could succeed to fabricate a large scale film(35m in length) with a roll-to-roll process.
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