Patent ID: 7252892

Claim:
An organic electroluminescent device which comprises a coumarin derivative represented by either General Formula 1 or 2 and optionally a luminescent compound as a host compound, with the proviso that, when said luminescent compound is used, said coumarin derivative is used as a guest compound for said luminescent compound: wherein in General Formulae 1 and 2, X denotes a carbon atom or a heteroatom; R 1 to R 14 independently denote a hydrogen atom or a substituent, provided that R 6 is not a cyano group R 3 and/or R 4 are absent when R 1 and/or R 2 form a ring structure containing both the nitrogen atom linked with R 1 and/or R 2 and the carbon atom linked with R 3 or R 4 ; at least one of R 9 to R 12 is a hydrocarbon group which may bear a substituent; R 13 and R 14 do not form a phenyl group and in the case that X is a divalent or trivalent heteroatom, R 7 and/or R 8 are absent.