Invention Grant
- Patent Title: Organic light emitting element with increased efficiency of extracting blue light
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Application No.: US14908337Application Date: 2014-07-23
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Publication No.: US09698382B2Publication Date: 2017-07-04
- Inventor: Keiko Kurata , Muneharu Sato , Tetsuro Kondoh , Shinichiro Ishino
- Applicant: JOLED INC.
- Applicant Address: JP Tokyo
- Assignee: JOLED INC.
- Current Assignee: JOLED INC.
- Current Assignee Address: JP Tokyo
- Agency: Greenblum & Bernstein, P.L.C.
- Priority: JP2013-160596 20130801
- International Application: PCT/JP2014/003865 WO 20140723
- International Announcement: WO2015/015762 WO 20150205
- Main IPC: H01L27/15
- IPC: H01L27/15 ; H01L31/12 ; H01L33/00 ; H01L51/52 ; H01L27/32

Abstract:
Each of blue light emitting elements includes: a photoanode; a translucent cathode; an organic light emitting layer between the photoanode and the translucent cathode; a first functional layer between the organic light emitting layer and the photoanode; and a second functional layer between the organic light emitting layer and the translucent cathode, and has a resonator structure. The first functional layer has an optical film thickness of 48-62 nm. The translucent cathode is a stack of a first translucent conductive layer, a metal layer, and a second translucent conductive layer stacked in this order from the second functional layer side. The first translucent conductive layer has a refractivity of 2.0-2.4, and a film thickness of 85-97 nm. The metal layer has a refractivity different by 0 to 2.0 from that of the first translucent conductive layer, and has a film thickness of 2-22 nm.
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