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Effects of Passivation Thin Films on the Optical Properties of the Green Organic Light Emitting Diodes
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 Title & Authors
Effects of Passivation Thin Films on the Optical Properties of the Green Organic Light Emitting Diodes
Mun, Sae Chan; Lee, Sang Hee; Park, Byung Min; Pyee, Jaeho; Chang, Ho Jung;
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The organic light emitting diodes (OLEDs) have been studied as large flexible displays, light source and hard wares of internet of things. However, OLEDs show some drawbacks in terms of external environments due to the low work function of the metals and the reactive organic materials. In particular, the operation functions of the OLEDs tend to deteriorate rapidly by exposing the oxygen and moisture. So as to prevent it, domestic and overseas studies underway in various method such as ALD, PVD, CVD. But it has complex process and high cost. Therefore In order to protect devices from the external environments, it is important to develop the passivation thin films of low-cost and simple process which can prevent the devices from the penetration of the oxygen and moistures. In this study, to improve the reliability, passivation thin films were coated onto the green OLEDs by spin coating method and investigated the changes of the optical properties of the prepared devices at various doping concentrations of sodium alginate (SA). The passivation solutions were synthesized by using polyvinyl alcohol (PVA) host material with a dopant of SA which were added with the amounts of 10, 20 and 40 wt% into the PVA. As a result, the best barrier properties of the OLEDs were obtained for the samples with 40 wt% SA. Finally, the passivation films can be optimized by using the mixture solution of PVA and SA materials.
Passivation Film;Polyvinyl alcohol (PVA);Sodium Alginate (SA);Spin Coating;Green Organic Light Emitting Diodes (OLEDs);
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스프레이코팅법에 의한 패시베이션 박막이 플렉시블 CIGS 태양전지의 특성에 미치는 영향,이상희;박병민;김기홍;장영철;피재호;장호정;

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