There is provided an ink composition for an organic light-emitting device which can easily form a light-emitting layer having more excellent uniformity and which is suitable for forming a light-emitting layer by a wet method. An ink composition for an organic light-emitting device includes a light-emitting material, a binder resin, and a solvent, the binder resin containing a multi-branched copolymer of a monovinyl compound composed of a styrene-based monomer as an essential component with a multifunctional vinyl compound containing two or more ethylenically unsaturated double bonds, and the copolymer having a weight-average absolute molecular weight within a range of 200,000 to 800,000 determined by gel permeation chromatography using a multi-angle laser light scattering detector and a degree of branching within a range of 0.20 to 0.55 determined from an inertial radius. An organic light-emitting device includes a positive electrode, a light-emitting layer, and a negative electrode, the light-emitting layer containing the binder resin.
本发明提供了一种用于有机发光器件的油墨组合物,该组合物可轻松形成具有更佳均匀性的发光层,并且适用于通过湿法形成发光层。一种用于有机发光器件的油墨组合物包括
发光材料、粘合剂
树脂和溶剂,粘合剂
树脂含有单
乙烯基化合物的多支链共聚物,该共聚物由
苯乙烯基单体作为基本成分与含有两个或两个以上
乙烯基不饱和双键的多功能
乙烯基化合物组成、该共聚物通过使用多角度激光光散射检测器的凝胶渗透色谱法测定,其重量平均绝对分子量在 200,000 至 800,000 之间,支化度在 0.20 至 0.55 之间。20至0.55的范围内。有机发光器件包括正极、发光层和负极,发光层含有粘结
树脂。