| abstract |
A formulation, which is used for forming a functional material thin film in a printed electronic component, comprises a functional material and a solvent, and the solvent can be vaporized from the formulation to form the 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 boiling point of the first solvent is higher 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 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 having a uniform thickness and a strong electron transmission capability can be obtained. |