公开(公告)号：US12171127B2

公开(公告)日：2024-12-17

申请号：US18509704

申请日：2023-11-15

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro Ishisone ,  Satoshi Seo ,  Yusuke Nonaka ,  Nobuharu Ohsawa

IPC: H10K50/11 ,  H10K50/12 ,  H10K50/13 ,  H10K50/15 ,  H10K50/16 ,  H10K50/17 ,  H10K50/18 ,  H10K50/81 ,  H10K50/828 ,  H10K50/85 ,  H10K50/86 ,  H10K59/12 ,  H10K59/35 ,  H10K50/84 ,  H10K85/30 ,  H10K85/60 ,  H10K101/10 ,  H10K101/30

Abstract: A multicolor light-emitting element that utilizes fluorescence and phosphorescence and is advantageous for practical application is provided. The light-emitting element has a stacked-layer structure of a first light-emitting layer containing a host material and a fluorescent substance and a second light-emitting layer containing two kinds of organic compounds and a substance that can convert triplet excitation energy into luminescence. Note that light emitted from the first light-emitting layer has an emission peak on the shorter wavelength side than light emitted from the second light-emitting layer.

公开(公告)号：US12010861B2

公开(公告)日：2024-06-11

申请号：US16593215

申请日：2019-10-04

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Satoko Shitagaki ,  Takahiro Ishisone ,  Satoshi Seo ,  Takeyoshi Watabe

IPC: H10K50/12 ,  H10K50/14 ,  H10K50/16 ,  H10K85/60

CPC classification number: H10K50/121 ,  H10K50/14 ,  H10K50/16 ,  H10K85/615 ,  H10K85/654 ,  H10K85/6572

Abstract: Provided is a light-emitting element which has an anode, a light-emitting layer over the anode, an electron-transport layer over and in contact with the light-emitting layer, an electron-injection layer over and in contact with the electron-transport layer, and a cathode over and in contact with the electron-injection layer. The light-emitting layer has an electron-transport property, and the electron-transport layer includes an anthracene derivative. The light-emitting layer further includes a phosphorescent substance. This device structure allows the formation of a highly efficient blue-emissive light-emitting element even though the phosphorescent substance has higher triplet energy than the anthracene derivative which directly contacts with the light-emitting layer.

公开(公告)号：US11937439B2

公开(公告)日：2024-03-19

申请号：US17733025

申请日：2022-04-29

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Satoshi Seo ,  Hiromi Seo ,  Tatsuyoshi Takahashi ,  Takahiro Ishisone

IPC: H01L51/50 ,  H10K50/11 ,  H10K50/13 ,  H10K50/81 ,  H10K50/82 ,  H10K85/30 ,  H10K85/60 ,  H10K101/00 ,  H10K101/10

CPC classification number: H10K50/13 ,  H10K50/11 ,  H10K50/81 ,  H10K50/82 ,  H10K85/342 ,  H10K85/633 ,  H10K85/636 ,  H10K85/6572 ,  H10K85/6576 ,  H10K85/341 ,  H10K85/346 ,  H10K85/615 ,  H10K85/624 ,  H10K85/626 ,  H10K2101/10 ,  H10K2101/27 ,  H10K2101/90

Abstract: A multicolor light-emitting element using fluorescence and phosphorescence, which has a small number of manufacturing steps owing to a relatively small number of layers to be formed and is advantageous for practical application can be provided. In addition, a multicolor light-emitting element using fluorescence and phosphorescence, which has favorable emission efficiency is provided. A light-emitting element which includes a light-emitting layer having a stacked-layer structure of a first light-emitting layer exhibiting light emission from a first exciplex and a second light-emitting layer exhibiting phosphorescence is provided.

公开(公告)号：US11177451B2

公开(公告)日：2021-11-16

申请号：US17038003

申请日：2020-09-30

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Satoshi Seo ,  Shunpei Yamazaki ,  Takahiro Ishisone

IPC: H01L51/50 ,  H01L51/52 ,  H01L51/00

Abstract: An object is to provide a light-emitting element which uses a plurality of kinds of light-emitting dopants and has high emission efficiency. In one embodiment of the present invention, a light-emitting device, a light-emitting module, a light-emitting display device, an electronic device, and a lighting device each having reduced power consumption by using the above light-emitting element are provided. Attention is paid to Förster mechanism, which is one of mechanisms of intermolecular energy transfer. Efficient energy transfer by Förster mechanism is achieved by making an emission wavelength of a molecule which donates energy overlap with the longest-wavelength-side local maximum peak of a graph obtained by multiplying an absorption spectrum of a molecule which receives energy by a wavelength raised to the fourth power.

公开(公告)号：US20210336173A1

公开(公告)日：2021-10-28

申请号：US17370526

申请日：2021-07-08

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunpei Yamazaki ,  Satoshi Seo ,  Yoshiharu Hirakata ,  Takahiro Ishisone

IPC: H01L51/50 ,  H01L33/50 ,  H05B33/14 ,  F21S6/00 ,  F21S8/04 ,  C09K11/06 ,  H05B33/20

Abstract: An object is to provide a light-emitting element which uses a plurality of kinds of light-emitting dopants and has high emission efficiency. In one embodiment of the present invention, a light-emitting device, a light-emitting module, a light-emitting display device, an electronic device, and a lighting device each having reduced power consumption by using the above light-emitting element are provided. Attention is paid to Förster mechanism, which is one of mechanisms of intermolecular energy transfer. Efficient energy transfer by Förster mechanism is achieved by making an emission wavelength of a molecule which donates energy overlap with a local maximum peak on the longest wavelength side of a graph obtained by multiplying an absorption spectrum of a molecule which receives energy by a wavelength raised to the fourth power.

公开(公告)号：US10756286B2

公开(公告)日：2020-08-25

申请号：US15498692

申请日：2017-04-27

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Takahiro Ishisone ,  Satoshi Seo

IPC: H01L51/50 ,  H01L51/00

Abstract: A light-emitting element with high luminous efficiency is provided. The light-emitting element contains a first organic compound and a second organic compound. The first and second organic compounds form an exciplex. The first organic compound emits no fluorescence but phosphorescence at a temperature ranging from low temperature to normal temperature. The luminescence quantum yield of the first organic compound is higher than or equal to 0% and lower than or equal to 40% at room temperature. Light emitted from the light-emitting element includes light emitted from an exciplex formed by the first organic compound and the second organic compound.

公开(公告)号：US10586932B2

公开(公告)日：2020-03-10

申请号：US15166585

申请日：2016-05-27

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunsuke Hosoumi ,  Tatsuyoshi Takahashi ,  Takahiro Ishisone ,  Satoshi Seo

IPC: H01L51/00 ,  C07D491/048 ,  C07D495/04 ,  C09K11/06 ,  C09K11/02 ,  H01L51/50

Abstract: A light-emitting element having high emission efficiency is provided. A light-emitting element which has high emission efficiency without using a rare metal as a light-emitting material is provided. A light-emitting element includes a first electrode, a second electrode, and a layer between the first electrode and the second electrode. The layer contains a first organic compound and a second organic compound. The second organic compound has a carbazole skeleton and a substituted or unsubstituted bivalent aromatic hydrocarbon group. The second organic compound further has a benzofuropyrimidine skeleton or a benzothienopyrimidine skeleton. The aromatic hydrocarbon group is bonded to the carbazole skeleton. The aromatic hydrocarbon group is bonded to the benzofuropyrimidine skeleton or the benzothienopyrimidine skeleton. The first organic compound and the second organic compound can form an exciplex.

公开(公告)号：US20200035940A1

公开(公告)日：2020-01-30

申请号：US16593215

申请日：2019-10-04

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Satoko Shitagaki ,  Takahiro Ishisone ,  Satoshi Seo ,  Takeyoshi Watabe

IPC: H01L51/50

Abstract: Provided is a light-emitting element which has an anode, a light-emitting layer over the anode, an electron-transport layer over and in contact with the light-emitting layer, an electron-injection layer over and in contact with the electron-transport layer, and a cathode over and in contact with the electron-injection layer. The light-emitting layer has an electron-transport property, and the electron-transport layer includes an anthracene derivative. The light-emitting layer further includes a phosphorescent substance. This device structure allows the formation of a highly efficient blue-emissive light-emitting element even though the phosphorescent substance has higher triplet energy than the anthracene derivative which directly contacts with the light-emitting layer.

公开(公告)号：US20190341568A1

公开(公告)日：2019-11-07

申请号：US16515596

申请日：2019-07-18

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunpei Yamazaki ,  Satoshi Seo ,  Yoshiharu Hirakata ,  Takahiro Ishisone

IPC: H01L51/50 ,  H01L33/50 ,  H05B33/14 ,  F21S6/00 ,  F21S8/04 ,  H05B33/20 ,  C09K11/06

Abstract: An object is to provide a light-emitting element which uses a plurality of kinds of light-emitting dopants and has high emission efficiency. In one embodiment of the present invention, a light-emitting device, a light-emitting module, a light-emitting display device, an electronic device, and a lighting device each having reduced power consumption by using the above light-emitting element are provided. Attention is paid to Førster mechanism, which is one of mechanisms of intermolecular energy transfer. Efficient energy transfer by Førster mechanism is achieved by making an emission wavelength of a molecule which donates energy overlap with a local maximum peak on the longest wavelength side of a graph obtained by multiplying an absorption spectrum of a molecule which receives energy by a wavelength raised to the fourth power.

公开(公告)号：US10439158B2

公开(公告)日：2019-10-08

申请号：US15900832

申请日：2018-02-21

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Takuya Kawata ,  Nobuharu Ohsawa ,  Yusuke Nonaka ,  Takahiro Ishisone ,  Satoshi Seo

IPC: H01L51/50 ,  H01L51/00

Abstract: A light-emitting element includes a stack of a first light-emitting layer emitting fluorescent light and a second light-emitting layer emitting phosphorescent light between a pair of electrodes. The second light-emitting layer includes a first layer in which an exciplex is formed, a second layer in which an exciplex is formed, and a third layer in which an exciplex is formed. The second layer is located over the first layer, and the third layer is located over the second layer. An emission peak wavelength of the second layer is longer than an emission peak wavelength of the first layer and an emission peak wavelength of the third layer.