Patent ID: 7901962

Claim:
A method for preparing an organic light-emitting diode, comprising: (A) providing a substrate, a first electrode being disposed on a surface of the substrate; (B) using a first solution to perform a first film-forming process and thus form a first light-emitting layer over the first electrode, wherein the first solution comprises a first solvent and a first dye; (C) using a second solution to perform a second film-forming process and thus form a second light-emitting layer over the first light-emitting layer, wherein the second solution comprises a second solvent and a second dye, and the first solvent and the second solvent are different solvents and satisfy at least one of the following conditions: a dipole moment difference between the first solvent and the second solvent being 0.5 D or more, and a viscosity of the first solvent being 0.3 mPa·s or more; and (D) forming a second electrode over the second light-emitting layer.