| US 7,485,375 B2 | ||
| Light emitting device and a method of manufacturing thereof | ||
| Atsushi Tokuda, Kanagawa (Japan); Takako Takasu, Kanagawa (Japan); Satoshi Seo, Kanagawa (Japan); and Ryoji Nomura, Kanagawa (Japan) | ||
| Assigned to Semiconductor Energy Laboratory Co., Ltd., Kanagawa-Ken (Japan) | ||
| Filed on Dec. 16, 2003, as Appl. No. 10/735,732. | ||
| Claims priority of application No. 2002-368692 (JP), filed on Dec. 19, 2002. | ||
| Prior Publication US 2004/0241492 A1, Dec. 02, 2004 | ||
| Int. Cl. H01L 51/50 (2006.01) | ||
| U.S. Cl. 428—690 [428/917; 313/504; 313/506] | 14 Claims |
| 1. A light-emitting device comprising:
a cathode;
an anode that constitutes a pair together with the cathode;
a hole injecting layer in contact with the anode and disposed between the anode and the cathode; and
a luminescent layer that is disposed between the hole injecting layer and the cathode and emits light when an electric field
is applied,
wherein the hole injecting layer comprises an electron-accepting organic compound and a conjugate polymer and
wherein the conjugate polymer has a repeating unit expressed by the formula (1)
 wherein R1 and R2 are the same or different and selected from a dialkylamino group, a trialkylsilyl group, and an aromatic substitution group
having a substitution group selected from a thioalkyl group, a dialkylamino group, and a trialkylsilyl group.
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