. "In the organic compound layer is used a organic compound shown by the following formula (1): ##STR1## wherein R1 is a hydrogen atom, an alkyl group or a halogen atom, R2 is X--Ar1...http://www.google.com/patents/US6017644?utm_source=gb-gplus-sharePatent US6017644 - Organic compound, its polymer and light emitting deviceAdvanced Patent SearchPublication numberUS6017644 APublication typeGrantApplica" . . . . . .