| 초록 |
Organic light-emitting diodes (OLED) has been attracted attention for the next generation display. However, their disadvantages such as short life time and water sensitivity are restricted in applications due to their high gas permeation. Thus, many researchers have tried to fabricate high performance gas barrier materials. Inorganic materials have low permeation values but they also have many defects which can deteriorate the gas barrier performance. Consequently, the combination of polymer and inorganic multi-layers (dyads) was used for high performance gas barrier coating films. However, organic materials are just used for defect healing and surface smoothing layers. In this study, we design the epoxy hybrimers which consist of siloxane networks and organic functional groups using non-hydrolytic sol-gel reaction. Also, we synthesized the titanium doped epoxy hybrimers to increase a density of coating films and to provide hydroxyl groups which can chemically reactive with water molecules. We measured the water vapor transition rate (WVTR) and oxygen transition rate (ORT) of the hybrimers films using a Ca test method. We also demonstrate the extended life time of encapsulated OLEDs with a hybrimers barrier coating films. The hybrimers show excellent barrier properties (WVTR and OTR＜ 1g/m2/day) because of highly cross-linked inorganic and organic networks, hydrophobic characteristics and hydroxyl groups of the cured films. They also show high photosensitivity, transmittance and smooth surface to be applied practically in various organic electronics fields. |
