发明授权
- 专利标题: Organic light emitting element and a light emitting device using the same
- 专利标题(中): 有机发光元件和使用其的发光器件
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申请号: US11319216申请日: 2005-12-28
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公开(公告)号: US07504771B2公开(公告)日: 2009-03-17
- 发明人: Hiroko Yamazaki , Satoshi Seo
- 申请人: Hiroko Yamazaki , Satoshi Seo
- 申请人地址: JP Kanagawa-Ken
- 专利权人: Semiconductor Energy Laboratory Co., Ltd.
- 当前专利权人: Semiconductor Energy Laboratory Co., Ltd.
- 当前专利权人地址: JP Kanagawa-Ken
- 代理机构: Nixon Peabody LLP
- 代理商 Jeffrey L. Costellia
- 主分类号: H01J1/62
- IPC分类号: H01J1/62
摘要:
The present invention provides a white organic light-emitting element high in the emission efficiency. In particular, the invention provides a white organic light-emitting element that has an emission spectrum having peaks in the respective wavelength regions of red color, green color and blue color and is high in the emission efficiency.Since a spectrum region lowest in the emission efficiency is a red region, by introducing a reddish phosphorescent material, a highly efficient white organic light-emitting element is obtained. At this time, in order to inhibit the reddish phosphorescent material from singularly emitting, as shown in FIG. 1, a distance between a second emission region 114 where a reddish phosphorescent material 124 is a luminescent material and a first emission region 113 that exhibits emission in a shorter wavelength side than the second emission region is separated. In a configuration shown in FIG. 1, it is preferable to use an electron transport material in a layer 115 between the first emission region and the second emission region and more preferable to use a hole block material.