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AssigneesBeijing Aglaia Technology Development Co., Ltd., Guangdong Aglaia Optoelectronic Materials Co., Ltd
InventorsLei Dai, Lifei Cai
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Disclosed is an improved sublimation method for the purification of organic small molecules. The new method features that barriers are applied in the collection region of sublimation tube so that the gas flow path is modified to pass through or bypass the barriers from the heating region to the vacuum pump. The arrangement of the barriers can effectively separate the main product from the impurities. The main product is enriched in a collection region, while the volatile impurities are enriched in an impurity region. This method has been proved to improve the quality of sublimed materials substantially according to the purity measurements and OLED performance tests.
A sublimation purification method of organic small molecules, an organic-small-molecule compound to be sublimed being placed in the heating region of a sublimation tube, and a vacuum pump being started, a temperature gradient being built up by stepwise heating, the main product being enriched in a collection region and the volatile impurities being enriched in an impurity region, the new system comprising barriers fastened in the collection region so that gas is capable of passing through or bypassing the barriers from the heating region to a vacuum pump joint.
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