| 摘要 |
The present invention relates to a method for refining organic electroluminescent materials at high purity, which is capable of collecting expensive organic electroluminescent materials, which are attached to a deposition apparatus after vacuum deposition of an organic electroluminescent layer in the manufacturing process of an organic light emitting display device to be wasted, recrystallizing the unrefined organic electroluminescent materials under a recrystallization solvent and obtaining the organic electroluminescent materials of more than 98% purity in a preliminary purification process, and treating the organic electroluminescent materials by absorption separation and sublimation purification. The refining method of the present invention can improve purity through the preliminary purification process including a recrystallization method using an organic solvent, thereby simplifying the processes, facilitating works, obtaining uniform quality, and improving yield. Accordingly, finally refined organic electroluminescent materials can be obtained at high purity of more than 99.95% and high yield to be reused, thereby reducing production costs. |
