| US 7,476,745 B2 | ||
| Stilbene derivatives, light-emitting element and light-emitting device | ||
| Masakazu Egawa, Kanagawa (Japan); Harue Nakashima, Kanagawa (Japan); Sachiko Kawakami, Kanagawa (Japan); Nobuharu Ohsawa, Kanagawa (Japan); Satoshi Seo, Kanagawa (Japan); and Ryoji Nomura, Kanagawa (Japan) | ||
| Assigned to Semiconductor Energy Laboratory Co., Ltd., (Japan) | ||
| Filed on Oct. 02, 2006, as Appl. No. 11/542,157. | ||
| Claims priority of application No. 2005-292366 (JP), filed on Oct. 05, 2005; and application No. 2005-343674 (JP), filed on Nov. 29, 2005. | ||
| Prior Publication US 2007/0080630 A1, Apr. 12, 2007 | ||
| Int. Cl. C07D 209/82 (2006.01); C07D 209/88 (2006.01) | ||
| U.S. Cl. 548—440 [548/444] | 8 Claims |
1. A stilbene derivative represented by a general formula (1),
 wherein R1 is hydrogen, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 25 carbon atoms;
wherein R2 is an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 25 carbon atoms;
wherein each of R3 to R5 is hydrogen or an alkyl group having 1 to 4 carbon atoms; and
wherein Ar1 is an aryl group having 6 to 25 carbon atoms.
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