| 摘要 |
A method purifies a starting solid or semi-solid organic composition located in a chamber. The method includes heating the starting organic composition such that molecules of one organic molecular species sublime out of the composition and molecules of a desired organic molecular species remain in the composition. The method includes pumping the chamber during the heating step to remove sublimed organic molecules. The method includes then, heating a remaining portion of the composition at one or more higher temperatures such that molecules of the desired organic molecular species sublime from the remaining portion of the composition. A separate region of the chamber is maintained under conditions that cause deposition of sublimed molecules of the desired species during the heating a remaining portion.
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