申请人:Guangzhou Chinaray Optoelectronic Materials Ltd.
公开号:EP3546532A1
公开(公告)日:2019-10-02
A printing ink formulation includes a functional material and a solvent being evaperable from the printing ink formulation to form a functional material thin film. The solvent is formed by mixing at least two organic solvents including a first solvent and a second solvent. The first solvent and the second solvent are soluble with each other, the boiling point of at least one of the first solvent and the second solvent is higher than or equal to 160 °C, the surface tension of the first solvent is smaller than that of the second solvent, the viscosity of the first solvent is higher than that of the second solvent, and a difference between the surface tension of the first solvent and the surface tension of the second solvent is at least 2 dyne/cm, and a difference between the viscosity of the first solvent and the viscosity of the second solvent is at least 2 cPs,. The solvent system containing at least two solvents can effectively dissolve the functional material without the need of adding an additive, and can also effectively prevent the occurrence of a "coffee-ring effect", and accordingly, the thin film containing a uniform thickness and a strong electron transmission capability can be obtained.
一种印刷油墨配方包括一种功能材料和一种可从印刷油墨配方中蒸发以形成功能材料薄膜的溶剂。溶剂由至少两种有机溶剂混合而成,包括第一种溶剂和第二种溶剂。第一种溶剂和第二种溶剂互溶,第一种溶剂和第二种溶剂中至少一种溶剂的沸点高于或等于 160 °C,第一种溶剂的表面张力小于第二种溶剂的表面张力、第一种溶剂的粘度高于第二种溶剂的粘度,第一种溶剂的表面张力与第二种溶剂的表面张力之差至少为 2 dyne/cm,第一种溶剂的粘度与第二种溶剂的粘度之差至少为 2 cPs。含有至少两种溶剂的溶剂体系可有效溶解功能材料,无需添加添加剂,还能有效防止 "咖啡环效应 "的发生,从而获得厚度均匀、电子传输能力强的薄膜。