Invention Grant
- Patent Title: Electroluminescent element and light-emitting device
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Application No.: US15802557Application Date: 2017-11-03
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Publication No.: US10033008B2Publication Date: 2018-07-24
- Inventor: Hiroko Abe
- Applicant: Semiconductor Energy Laboratory Co., Ltd.
- Applicant Address: JP Atsugi-shi, Kanagawa-ken
- Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee Address: JP Atsugi-shi, Kanagawa-ken
- Agency: Fish & Richardson P.C.
- Priority: JP2003-105135 20030409
- Main IPC: H01L51/54
- IPC: H01L51/54 ; H01L51/50 ; C09K11/06 ; H01L51/52 ; H01L51/00 ; H05B33/14 ; C09K11/02

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
- US20180108855A1 ELECTROLUMINESCENT ELEMENT AND LIGHT-EMITTING DEVICE Public/Granted day:2018-04-19
Information query
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