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：US20180182330A1

公开(公告)日：2018-06-28

申请号：US15849003

申请日：2017-12-20

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunsuke Hosoumi ,  Satoshi Seo

IPC: G09G3/36 ,  G02F1/1335 ,  G09G3/3233 ,  H01L51/52 ,  H01L51/50

Abstract: A highly reliable light-emitting element that shows a novel degradation curve when driven is provided. The degradation curve of a light-emitting element with a long lifetime is represented by a function composed of two exponential functions, which is a linear combination of an exponential function expressing an initial degradation component and an exponential function expressing a long-term degradation component. The initial degradation component is represented by a stretched exponential function, and the long-term degradation component is represented by a single exponential function. When the proportion of the initial degradation component of the degradation curve represented by the function composed of two exponential functions is less than or equal to 0.25, preferably less than or equal to 0.20, and further preferably less than or equal to 0.15; a highly reliable light-emitting element is obtained.

公开(公告)号：US11997861B2

公开(公告)日：2024-05-28

申请号：US18100054

申请日：2023-01-23

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Satoshi Seo ,  Nobuharu Ohsawa ,  Shunsuke Hosoumi ,  Takahiro Ishisone

IPC: H10K50/11 ,  H10K101/10 ,  H10K101/30

CPC classification number: H10K50/11 ,  H10K2101/10 ,  H10K2101/30

Abstract: A light-emitting element having high emission efficiency which includes a fluorescent material as a light-emitting substance is provided. A light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a light-emitting layer. The light-emitting layer includes a host material and a guest material. The host material has a difference of more than 0 eV and less than or equal to 0.2 eV between a singlet excitation energy level and a triplet excitation energy level. The guest material is capable of emitting fluorescence. The triplet excitation energy level of the host material is higher than a triplet excitation energy level of the guest material.

公开(公告)号：US10454052B2

公开(公告)日：2019-10-22

申请号：US15944013

申请日：2018-04-03

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01L51/50 ,  H01L51/00

Abstract: A light-emitting element containing a fluorescent material and having high emission efficiency is provided. The light-emitting element contains the fluorescent material and a host material. The host material contains a first organic compound and a second organic compound. The first organic compound and the second organic compound can form an exciplex. The minimum value of a distance between centroids of the fluorescent material and at least one of the first organic compound and the second organic compound is 0.7 nm or more and 5 nm or less.

公开(公告)号：US20180182992A1

公开(公告)日：2018-06-28

申请号：US15854276

申请日：2017-12-26

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Satoshi Seo ,  Shunsuke Hosoumi ,  Shunpei Yamazaki

IPC: H01L51/52 ,  H01L27/32

CPC classification number: H01L51/52 ,  H01L27/3213 ,  H01L27/323 ,  H01L27/3232 ,  H01L27/3267 ,  H01L27/3276 ,  H01L51/0031 ,  H01L51/50 ,  H01L51/5246 ,  H01L51/5275 ,  H01L2251/5338 ,  H01L2251/5361

Abstract: A highly reliable light-emitting element that shows a novel degradation curve when driven is provided. The degradation curve of a light-emitting element with a long lifetime is represented by a function composed of two exponential functions, which is a linear combination of an exponential function expressing an initial degradation component and an exponential function expressing a long-term degradation component. The initial degradation component is represented by a stretched exponential function, and the long-term degradation component is represented by a single exponential function. The light-emitting element is highly reliable when formed to show a degradation curve represented by the function composed of two exponential functions. In other words, the function composed of two exponential functions in one embodiment of the present invention is capable of accurately fitting the degradation curve of the highly reliable light-emitting element.

公开(公告)号：US20150243892A1

公开(公告)日：2015-08-27

申请号：US14625834

申请日：2015-02-19

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Kaori Ogita ,  Tsunenori Suzuki ,  Naoaki Hashimoto ,  Toshiki Hamada ,  Kunihiko Suzuki ,  Shunsuke Hosoumi ,  Satoshi Seo

IPC: H01L51/00 ,  C07D307/91 ,  C07C211/61

CPC classification number: H01L51/006 ,  C07C211/61 ,  C07C2603/18 ,  C07C2603/50 ,  C07D307/91 ,  H01L51/0061 ,  H01L51/0073 ,  H01L51/5012

Abstract: A light-emitting element with high emission efficiency. The light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. In the light-emitting element, the EL layer contains at least a light-emitting material, the light-emitting material is a 1,6-bis(diphenylamino)pyrene derivative, and a structural change between an excited state and a ground state in the 1,6-bis(diphenylamino)pyrene derivative is smaller than that in a 1,6-bis(diphenylamino)pyrene derivative in which hydrogen is bonded to ortho positions of two phenyl groups of each of two diphenylamino groups.

Abstract translation: 发光效率高的发光元件。 发光元件包括一对电极和一对电极之间的EL层。 在发光元件中，EL层至少含有发光材料，发光材料为1,6-双（二苯基氨基）芘衍生物，激发态与基态之间的结构变化为 1,6-双（二苯基氨基）芘衍生物小于1,6-双（二苯基氨基）芘衍生物，其中氢与两个二苯基氨基中的每一个的两个苯基的邻位键合。

公开(公告)号：US11563191B2

公开(公告)日：2023-01-24

申请号：US16923526

申请日：2020-07-08

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Satoshi Seo ,  Nobuharu Ohsawa ,  Shunsuke Hosoumi ,  Takahiro Ishisone

IPC: H01L51/50

Abstract: A light-emitting element having high emission efficiency which includes a fluorescent material as a light-emitting substance is provided. A light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a light-emitting layer. The light-emitting layer includes a host material and a guest material. The host material has a difference of more than 0 eV and less than or equal to 0.2 eV between a singlet excitation energy level and a triplet excitation energy level. The guest material is capable of emitting fluorescence. The triplet excitation energy level of the host material is higher than a triplet excitation energy level of the guest material.

公开(公告)号：US11038134B2

公开(公告)日：2021-06-15

申请号：US16595639

申请日：2019-10-08

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01L51/50 ,  H01L51/00

Abstract: A light-emitting element containing a fluorescent material and having high emission efficiency is provided. The light-emitting element contains the fluorescent material and a host material. The host material contains a first organic compound and a second organic compound. The first organic compound and the second organic compound can form an exciplex. The minimum value of a distance between centroids of the fluorescent material and at least one of the first organic compound and the second organic compound is 0.7 nm or more and 5 nm or less.

公开(公告)号：US10714700B2

公开(公告)日：2020-07-14

申请号：US16513869

申请日：2019-07-17

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Satoshi Seo ,  Nobuharu Ohsawa ,  Shunsuke Hosoumi ,  Takahiro Ishisone

IPC: H01L51/50

Abstract: A light-emitting element having high emission efficiency which includes a fluorescent material as a light-emitting substance is provided. A light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a light-emitting layer. The light-emitting layer includes a host material and a guest material. The host material has a difference of more than 0 eV and less than or equal to 0.2 eV between a singlet excitation energy level and a triplet excitation energy level. The guest material is capable of emitting fluorescence. The triplet excitation energy level of the host material is higher than a triplet excitation energy level of the guest material.

公开(公告)号：US20180248123A1

公开(公告)日：2018-08-30

申请号：US15958665

申请日：2018-04-20

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

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

Abstract: A light-emitting element containing a fluorescent material and having high emission efficiency is provided. The light-emitting element contains the fluorescent material and a host material. The host material contains a first organic compound and a second organic compound. The first organic compound and the second organic compound can form an exciplex. The proportion of a delayed fluorescence component in light emitted from the exciplex is higher than or equal to 5%, and the delayed fluorescence component contains a delayed fluorescence component whose fluorescence lifetime is 10 ns or longer and 50 μs or shorter.