申请人:NISSAN CHEMICAL INDUSTRIES, LTD.
公开号:US10233337B2
公开(公告)日:2019-03-19
A charge-transporting thin film having excellent flatness can be obtained with good repeatability using the charge-transporting varnish of the present invention, which contains: a charge transportation substance comprising a charge-transporting monomer or a charge-transporting oligomer or polymer having a number-average molecular weight of 200-50,000, or a charge transporting material comprising the charge transportation substance and a dopant substance; and a mixed solvent including at least one type of good solvent and at least one type of poor solvent; the absolute value of the boiling point difference ΔT° C. of the good solvent and the poor solvent satisfying the relation |ΔT|<20° C.; the viscosity at 25° C. being 7.5 mPa·s or less; the surface tension at 23° C. being 30.0-40.0 mN/m; and the charge-transporting material being dissolved or uniformly dispersed in the mixed solvent.
使用本发明的电荷传输清漆,可以获得具有良好平整度和重复性的电荷传输薄膜,本发明的电荷传输清漆包含:电荷传输物质,包括平均分子量为 200-50,000 的电荷传输单体或电荷传输低聚物或聚合物;或电荷传输材料,包括电荷传输物质和掺杂物质;以及混合溶剂,包括至少一种良好溶剂和至少一种不良溶剂;良好溶剂和不良溶剂的沸点差 ΔT° C. 的绝对值满足以下条件的绝对值满足|ΔT|<20° C 的关系;25° C 时的粘度为 7.5 mPa-s 或以下;23° C 时的表面张力为 30.0-40.0 mN/m;电荷传输物质溶解或均匀分散在混合溶剂中。