| abstract |
An organic electroluminescent device material containing a coumarin derivative of the formula (1) and an organic electroluminescent device made from the material are disclosed.n n n <Formula 1>n n n n n n n n In the above formula, R 1 to R 4 independently represent a hydrogen atom, a halogen atom, or a substituted or unsubstituted alkyl, alkoxy, thioalkyl, aryloxy, arylthio, carbocyclic aromatic or heterocyclic aromatic group.n n n According to the present invention, it is possible to provide a red light emitting material having high brightness and high light emission efficiency which is essential in a full color display. |