Invention Grant
- Patent Title: Electroluminescent element and light-emitting device
- Patent Title (中): 电致发光元件和发光装置
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Application No.: US10819282Application Date: 2004-04-07
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Publication No.: US07862906B2Publication Date: 2011-01-04
- Inventor: Hiroko Abe
- Applicant: Hiroko Abe
- Applicant Address: JP Kanagawa-ken
- Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee Address: JP Kanagawa-ken
- Agency: Fish & Richardson P.C.
- Priority: JP2003-105135 20030409
- Main IPC: B32B7/02
- IPC: B32B7/02 ; H01J1/62

Abstract:
An electroluminescent element which can easily control the balance of color in white emission (white balance) is provided according to the present invention. The electroluminescent element comprises a first light-emitting layer containing one kind or two or more kinds of light-emitting materials, and a second light-emitting layer containing two kinds of light-emitting materials (a host material and a phosphorescent material) in which the phosphorescent material is doped at a concentration of from 10 to 40 wt %, preferably, from 12.5 to 20 wt %. Consequently, blue emission can be obtained from the first light-emitting layer and green and red (or orange) emission can be obtained from the second light-emitting layer. An electroluminescent element having such device configuration can easily control white balance since emission peak intensity changes at the same rate in case of increasing a current density.
Public/Granted literature
- US20040202893A1 Electroluminescent element and light-emitting device Public/Granted day:2004-10-14
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