| 摘要 |
PROBLEM TO BE SOLVED: To provide a new hole-transporting compound having heat-resistance and low electric resistance and useful as an organic thin film luminescent element, an electrophotographic receptor, etc. SOLUTION: The objective compound is expressed by formula I (R1 is methyl, ethyl or the like; R2 is phenyl, tolyl or the like), e.g. the compound of formula II. The compound of formula I can be produced e.g. by the Ullmann reaction of N-phenyl-1-naphthylamine with 3,8-diiodo-6-phenanthridine obtained by the iodination of 3,8-diamino-6-phenyl-phenanthridine with sodium nitrite and potassium iodide. An organic semiconductor thin film can be produced by using the above compound singly or in the form of a mixture with other organic or inorganic semiconducting material and forming a thin film by vacuum evaporation, etc.
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