Invention Grant
- Patent Title: Top emission organic electroluminescent element, organic electroluminescent light emitting device, and electronic device
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Application No.: US16759788Application Date: 2018-11-01
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Publication No.: US11456432B2Publication Date: 2022-09-27
- Inventor: Takayasu Sado , Tetsuya Masuda , Yoshiaki Takahashi , Emiko Kambe
- Applicant: IDEMITSU KOSAN CO.,LTD.
- Applicant Address: JP Tokyo
- Assignee: IDEMITSU KOSAN CO.,LTD.
- Current Assignee: IDEMITSU KOSAN CO.,LTD.
- Current Assignee Address: JP Tokyo
- Agency: Foley & Lardner LLP
- Priority: JPJP2017-212287 20171101
- International Application: PCT/JP2018/040734 WO 20181101
- International Announcement: WO2019/088231 WO 20190509
- Main IPC: H01L51/50
- IPC: H01L51/50 ; H01L51/00 ; H01L51/52

Abstract:
A top emission organic EL device includes an anode, hole transporting zone, emitting layer, electron transporting zone, and cathode in this order. The hole transporting zone includes: a first layer interposed between the anode and the emitting layer; and a second layer interposed between the first layer and the emitting layer. The first layer contains a first compound and the second layer contains a second compound. A film thickness of the first layer and the second layer satisfies a formula (1) and (2), respectively. A hole mobility μH1 of the first compound satisfies a formula (3) and a hole mobility μH2 of the second compound satisfies a formula (4), 100 nm≤d1≤300 nm (1) 1 nm≤d2≤20 nm (2) 1.0×10−4 [cm2/Vs]≤μH1≤1.0×10−1 [cm2/Vs] (3) 1.0×10−10 [cm2/Vs]≤μH2≤1.0×10−6 [cm2/Vs] (4).
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