公开(公告)号：US20220069246A1

公开(公告)日：2022-03-03

申请号：US17610760

申请日：2020-05-07

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Satoshi SEO ,  Hiroshi KADOMA ,  Takumu OKUYAMA ,  Naoaki HASHIMOTO ,  Yusuke TAKITA ,  Tsunenori SUZUKI

IPC: H01L51/50

Abstract: A light-emitting device having a long lifetime is provided. In a light-emitting device that includes an EL layer between a pair of electrodes, the carrier balance is controlled with a hole-injection layer and an electron-transport layer of the EL layer having certain structures, so that the carrier balance spontaneously changes during driving and the initial degradation of the light-emitting device is inhibited. In addition, at this time, the rate of the spontaneous change is low when an electron-injection barrier at the interface between a light-emitting layer and the electron-transport layer of the EL layer which are stacked is high; thus, it is possible to obtain a light-emitting device which is excellent in terms of long-term degradation.

公开(公告)号：US20210347782A1

公开(公告)日：2021-11-11

申请号：US16090477

申请日：2018-02-28

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Kyoko TAKEDA ,  Harue OSAKA ,  Satoshi SEO ,  Tsunenori SUZUKI ,  Naoaki HASHIMOTO ,  Yusuke TAKITA

IPC: C07D491/048 ,  C07D495/00 ,  H01L51/00

Abstract: A novel organic compound is provided. Alternatively, an organic compound that exhibits light emission with favorable chromaticity is provided. Alternatively, an organic compound that exhibits blue light emission with favorable chromaticity is provided. Alternatively, an organic compound with favorable emission efficiency is provided. Alternatively, an organic compound having a high carrier-transport property is provided. Alternatively, an organic compound with favorable reliability is provided.
An organic compound including at least one amino group in which any one of a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, and a substituted or unsubstituted carbazolyl group is bonded to any one of a substituted or unsubstituted naphthobisbenzofuran skeleton, a substituted or unsubstituted naphthobisbenzothiophene skeleton, and a substituted or unsubstituted naphthobenzofuranobenzothiophene skeleton is provided.

公开(公告)号：US20210249619A1

公开(公告)日：2021-08-12

申请号：US17048642

申请日：2019-10-03

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Satoshi SEO ,  Tsunenori SUZUKI ,  Takumu OKUYAMA ,  Yusuke TAKITA ,  Naoaki HASHIMOTO ,  Hiromi SEO ,  Nobuharu OHSAWA ,  Toshiki SASAKI ,  Shunpei YAMAZAKI

IPC: H01L51/50

Abstract: A novel light-emitting device is provided. Alternatively, a light-emitting device with high emission efficiency is provided. Alternatively, a light-emitting device having along lifetime is provided. Alternatively, a light-emitting device having low driving voltage is provided. A light-emitting device including an EL layer including a first layer, a second layer, a third layer, a light-emitting layer, and a fourth layer in this order from the anode side is provided. The first layer includes a first organic compound and a second organic compound. The fourth layer includes a seventh organic compound. The first organic compound exhibits an electron-accepting property with respect to the second organic compound. The HOMO level of the second organic compound is from −5.7 eV to −5.4 eV. The HOMO level of the seventh organic compound is −6.0 eV or higher.

公开(公告)号：US20210028371A1

公开(公告)日：2021-01-28

申请号：US16937793

申请日：2020-07-24

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takumu OKUYAMA ,  Naoaki HASHIMOTO ,  Yusuke TAKITA ,  Hiroshi KADOMA ,  Tsunenori SUZUKI ,  Satoshi SEO ,  Tomoya HIROSE

IPC: H01L51/00 ,  C07D491/048 ,  C07D401/10

Abstract: A novel light-emitting device is provided. A light-emitting device with high emission efficiency is provided. A light-emitting device having a long lifetime is provided. A light-emitting device with low driving voltage is provided. The light-emitting device includes an anode, a cathode, and an EL layer between the anode and the cathode. The EL layer includes a light-emitting layer and an electron-transport layer. The electron-transport layer is positioned between the light-emitting layer and the cathode. The electron-transport layer contains an electron-transport material. The electron-transport material is an organic compound including a first skeleton, a second skeleton, and a third skeleton. The first skeleton has a function of transporting electrons. The second skeleton has a function of accepting holes. The third skeleton includes a monocyclic π-electron deficient heteroaromatic ring.

公开(公告)号：US20180033993A1

公开(公告)日：2018-02-01

申请号：US15658622

申请日：2017-07-25

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Satoshi Seo ,  Tsunenori SUZUKI ,  Yusuke TAKITA ,  Naoaki HASHIMOTO

IPC: H01L51/50 ,  H01L51/00 ,  H01L51/56

CPC classification number: H01L51/5016 ,  H01L51/0008 ,  H01L51/0052 ,  H01L51/0058 ,  H01L51/0059 ,  H01L51/006 ,  H01L51/0072 ,  H01L51/0074 ,  H01L51/5012 ,  H01L51/5056 ,  H01L51/5064 ,  H01L51/5072 ,  H01L51/508 ,  H01L51/5088 ,  H01L51/56 ,  H01L2251/552

Abstract: A novel light-emitting element is provided. A light-emitting element with a long lifetime is provided. A light-emitting element with high emission efficiency is provided. In the light-emitting element, an EL layer includes a hole-injection layer, a first hole-transport layer, a second hole-transport layer, a third hole-transport layer, a light-emitting layer, a first electron-transport layer, and a second electron-transport layer in this order; the hole-injection layer includes an organic acceptor; the LUMO level of the host material is higher than that of the first electron-transport layer; the LUMO level of the second electron-transport layer is higher than that of the first electron-transport layer; the host material is a substance including a condensed aromatic ring skeleton; and the first and second electron-transport layers each include a substance having a heteroaromatic ring skeleton.

公开(公告)号：US20180026207A1

公开(公告)日：2018-01-25

申请号：US15652799

申请日：2017-07-18

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Kyoko Takeda ,  Harue OSAKA ,  Yusuke TAKITA ,  Naoaki HASHIMOTO ,  Tsunenori SUZUKI ,  Kunihiko SUZUKI ,  Satoshi SEO

IPC: H01L51/00 ,  C07D209/86 ,  C09K11/06

CPC classification number: H01L51/0072 ,  C07D209/86 ,  C09K11/06 ,  C09K2211/1007 ,  C09K2211/1011 ,  C09K2211/1018 ,  H01L51/0052 ,  H01L51/5028 ,  H05B33/14

Abstract: To provide a novel fluorescent organic compound (a fluorescent compound). The organic compound is a substance that emits fluorescence and an organic compound (a host material) in which FIA can occur efficiently. In the organic compound, triplet excitons, which do not contribute to light emission, can be efficiently converted into singlet excitons. The use of such an organic compound can increase emission efficiency of a light-emitting element.

公开(公告)号：US20240306408A1

公开(公告)日：2024-09-12

申请号：US18615075

申请日：2024-03-25

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Yusuke TAKITA ,  Tsunenori Suzuki ,  Naoaki Hashimoto ,  Takumu Okuyama ,  Satoshi Seo

IPC: H10K50/11 ,  H10K85/60 ,  H10K101/30 ,  H10K101/40

CPC classification number: H10K50/11 ,  H10K85/6574 ,  H10K2101/30 ,  H10K2101/40

Abstract: A novel light-emitting device is provided. Alternatively, a light-emitting device having a long driving lifetime at high temperature is provided. The light-emitting device ncludes an anode, a cathode, and an EL layer positioned between the anode and the cathode. The EL layer includes a first layer, a second layer, a third layer, and a light-emitting layer in this order from the anode side. The first layer includes a first organic compound and a second organic compound. The second layer includes a third organic compound. The third layer includes a fourth organic compound. The light-emitting layer includes a fifth organic compound and an emission center substance. The first organic compound exhibits an electron-accepting property with respect to the second organic compound. A difference between HOMO levels of the fourth organic compound and the fifth organic compound is less than or equal to 0.24 eV.

公开(公告)号：US20220231238A1

公开(公告)日：2022-07-21

申请号：US17605329

申请日：2020-04-13

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takumu OKUYAMA ,  Hiromi SEO ,  Naoaki HASHIMOTO ,  Yusuke TAKITA ,  Tsunenori SUZUKI ,  Satoshi SEO

IPC: H01L51/00

Abstract: A novel light-emitting device is provided. A light-emitting device with high emission efficiency is provided. A light-emitting device with a favorable lifetime is provided. A light-emitting device with low driving voltage is provided. The light-emitting device includes an anode, a cathode, and an EL layer positioned between the anode and the cathode. The EL layer includes a hole-injection layer, a light-emitting layer, and an electron-transport layer. The hole-injection layer contains a hole-transport material and an electron-accepting material. The electron-transport layer contains an electron-transport material and an alkali metal itself, an alkaline earth metal itself, a compound of an alkali metal or an alkaline earth metal, or a complex thereof. The hole-injection layer has the spin density measured by an ESR method is lower than or equal to 1×1019 spins/cm3.

公开(公告)号：US20220209128A1

公开(公告)日：2022-06-30

申请号：US17605379

申请日：2020-04-21

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takumu OKUYAMA ,  Hiromi SEO ,  Naoaki HASHIMOTO ,  Yusuke TAKITA ,  Tsunenori SUZUKI ,  Satoshi SEO

IPC: H01L51/00 ,  C09K11/02 ,  C09K11/06

Abstract: A novel light-emitting device is provided. A light-emitting device with high emission efficiency is provided. A light-emitting device with a favorable lifetime is provided. A light-emitting device with low driving voltage is provided. A light-emitting device with favorable display quality is provided. A light-emitting device that includes an anode, a cathode, and an EL layer positioned between the anode and the cathode, in which the EL layer includes a hole-injection layer, a light-emitting layer, and an electron-transport layer; in which the electron-transport layer contains an electron-transport material and an alkali metal, an alkaline earth metal, a compound of an alkali metal or an alkaline earth metal, or a complex thereof; and in which the resistivity of the hole-injection layer is within a certain range, is provided.

公开(公告)号：US20220158100A1

公开(公告)日：2022-05-19

申请号：US17439527

申请日：2020-03-11

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Hiroshi KADOMA ,  Satoshi SEO ,  Takumu OKUYAMA ,  Naoaki HASHIMOTO ,  Yusuke TAKITA ,  Tsunenori SUZUKI

IPC: H01L51/00 ,  C07D401/10 ,  C07D403/10

Abstract: A quinoxaline derivative that is a novel organic compound is provided. A quinoxaline derivative represented by General Formula (G1) has a structure in which a quinoxaline skeleton is bonded to the 9-position of an anthracene skeleton, the 10-position of the anthracene skeleton is bonded to a heteroaromatic ring, and the 3-position of the heteroaromatic ring is nitrogen. In General Formula (G1) shown above, a and b each independently represent a substituted or unsubstituted arylene group having 6 to 13 carbon atoms in a ring. In addition, m and n are each independently 0, 1, or 2.