ORGANIC LIGHT EMITTING ELEMENT, COMPOSITION AND MEMBRANE

This organic light emitting element, which contains both a compound represented by general formula (1) and a compound represented by general formula (2) has a high light emission efficiency. Rings a to c are optionally condensed benzene rings, R1 and R2 are substituted or unsubstituted aryl groups, four of R31-R35 part substituted or unsubstituted carbazol-9-yl groups but the four are not all thesame, and the remaining one is a hydrogen atom, a cyano group, etc. 同时包含下述通式(1)所表示的化合物和下述通式(2)所表示的化合物的有机发光元件具有高发光效率。a～c环为可以缩合的苯环，R1、R2为经取代或未经取代的芳基等，R31～R35中的四个为经取代或未经取代的咔唑-9-基，但是四个并不全部相同，其余一个为氢原子、氰基等。