Patents by Inventor Tsuyoshi Naijo

Tsuyoshi Naijo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240357852
    Abstract: A light emitting element includes a first electrode, a hole transport region on the first electrode, an emission layer on the hole transport region, an electron transport region on the emission layer, and a second electrode on the electron transport region. The electron transport region includes an electron transport layer on the emission layer, a first electron injection layer on the electron transport layer, and a second electron injection layer on the first electron injection layer, the thicknesses of the first and second electron injection layers are each about 1 nm to about 5 nm, the first electron injection layer includes a phenanthroline derivative and/or a phosphine oxide derivative, and the second electron injection layer includes a metal material.
    Type: Application
    Filed: February 26, 2024
    Publication date: October 24, 2024
    Inventors: SUNG-SOO BAE, TSUYOSHI NAIJO, SANG GYUN KIM, HOJUNG SYN, HYOSUP SHIN, JIYOUNG LEE, CHANGWOONG CHU
  • Publication number: 20240341184
    Abstract: Embodiments provide a light emitting element and a display device including the same. The light emitting element includes a first electrode, a second electrode, and a plurality of emission layers disposed between the first electrode and the second electrode, wherein at least one of the plurality of emission layers include a hole transporting host, an electron transporting host, a phosphorescent sensitizer, and a first fluorescent dopant. The first fluorescent dopant comprises a pentacyclic fused ring core that includes one boron atom and two heteroatoms as ring-forming atoms, and at least one amine substituent of the fused ring core; the at least one amine substituent is substituted with at least one substituted or unsubstituted pyrenyl group; and a difference between a triplet state energy level of the first fluorescent dopant and a singlet state energy level of the first fluorescent dopant is equal to or greater than about 0.4 eV.
    Type: Application
    Filed: February 8, 2024
    Publication date: October 10, 2024
    Applicant: Samsung Display Co., Ltd.
    Inventors: JIYOUNG LEE, TSUYOSHI NAIJO, YUNJEE PARK, SUNG-SOO BAE, HOJUNG SYN, HYOSUP SHIN, CHANGWOONG CHU
  • Publication number: 20240334729
    Abstract: A light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode and including an emission layer, wherein the emission layer includes a first compound, a second compound, a transition metal-containing compound, and a delayed fluorescence compound, the first compound being a hole transport material, and the second compound being an electron transport material, the first compound and the second compound form an exciplex, the first compound, the second compound, or any combination thereof is substituted with at least one deuterium, and an absolute value of a triplet charge transfer state-singlet ground state non-radiative decay rate constant of a mixture of the first compound and the second compound is decreased, compared to a case in which the first compound, the second compound, or any combination thereof is not substituted with deuterium.
    Type: Application
    Filed: October 20, 2023
    Publication date: October 3, 2024
    Inventors: Jiyoung Lee, Makoto Yamamoto, Tsuyoshi Naijo, Toshiyuki Matsuura, Sungsoo Bae, Hojung Syn, Hyosup Shin, Heechoon Ahn, Changwoong Chu
  • Publication number: 20240324267
    Abstract: A light-emitting device includes an emission layer including a first host, a second host, a first dopant, and a second dopant. The first dopant is a metal-containing compound, the second dopant is a boron-containing compound, the first host and the second host combine to form a host exciplex, the host exciplex is in a triplet (T1) state, and the host exciplex in the T1 state is also in a local-excitation state.
    Type: Application
    Filed: January 11, 2024
    Publication date: September 26, 2024
    Inventors: Jiyoung Lee, Makoto Yamamoto, Tsuyoshi Naijo, Toshiyuki Matsuura, Sungsoo Bae, Hojung Syn, Hyosup Shin, Heechoon Ahn, Changwoong Chu
  • Publication number: 20240324262
    Abstract: A composition includes a first compound and a second compound different from the first compound and satisfies Expressions 1 and 2: PLQY ? ( E ) > 70 ? % Expression ? 1 T < 10 ? ?s , Expression ? 2 wherein, in Expressions 1 and 2, PLQY(E) is a photoluminescence quantum yield measured with respect to a first film, ?0 is a decay time measured with respect to a second film, the first film includes the first compound, and the second film includes the first compound and the second compound.
    Type: Application
    Filed: January 16, 2024
    Publication date: September 26, 2024
    Inventors: Hyosup Shin, Makoto Yamamoto, Tsuyoshi Naijo, Toshiyuki Matsuura, Sungsoo Bae, Hojung Syn, Heechoon Ahn, Jiyoung Lee, Changwoong Chu
  • Publication number: 20240298457
    Abstract: Embodiments provide a light-emitting device that include a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode. The interlayer includes an emission layer, and the emission layer includes a first emission layer and a second emission layer. The first emission layer includes a first host and a first-first dopant, or a first host, a first-first dopant, and a first-second dopant. The second emission layer includes a second host and a second-first dopant, or a second host, a second-first dopant, and a second-second dopant. The emission layer includes the first-second dopant and/or the second-second dopant, the first emission layer and the second emission layer directly contact each other, and a thickness of the second emission layer is greater than a thickness of the first emission layer.
    Type: Application
    Filed: September 12, 2023
    Publication date: September 5, 2024
    Applicant: Samsung Display Co., Ltd.
    Inventors: Sungsoo Bae, Tsuyoshi Naijo, Hojung Syn, Hyosup Shin, Jiyoung Lee, Changwoong Chu
  • Patent number: 12082497
    Abstract: An organic light-emitting device includes a condensed cyclic compound represented by Formula 1: The condensed cyclic compound has an electron withdrawing group (EWG) substituent and an electron donating group (EDG) substituent at suitable positions, and thus has a low ?EST and may be used as an effective thermally activated delayed fluorescence (TADF) light-emitting material.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: September 3, 2024
    Assignee: Samsung Display Co., Ltd.
    Inventors: Seulong Kim, Jungmin Kang, Tsuyoshi Naijo, Hyein Jeong, Soungwook Kim
  • Publication number: 20240237382
    Abstract: A light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode and including a reverse potential layer and an emission layer, where a sign of a giant surface potential value of the reverse potential layer is opposite to a sign of a giant surface potential value of the emission layer.
    Type: Application
    Filed: December 4, 2023
    Publication date: July 11, 2024
    Inventors: Hyosup Shin, Tsuyoshi Naijo, Sungsoo Bae, Hojung Syn, Changwoong Chu
  • Publication number: 20240215286
    Abstract: A light emitting device of an embodiment includes a first light emitting unit including a first emission layer, and a second light emitting unit including a second emission layer. The first emission layer includes a first host, a phosphorescence sensitizer, a first fluorescence dopant, the second emission layer includes a second host which is different from the first host, and a second fluorescence dopant, the first fluorescence dopant has a highest occupied molecular orbital (HOMO) energy level of about ?5.2 eV or less, and the second fluorescence dopant has a HOMO energy level of about ?5.2 eV or more.
    Type: Application
    Filed: November 22, 2023
    Publication date: June 27, 2024
    Inventors: HYOSUP SHIN, TSUYOSHI NAIJO, YUNJEE PARK, SUNG-SOO BAE, HOJUNG SYN, JIYOUNG LEE, CHANGWOONG CHU
  • Publication number: 20240155861
    Abstract: Embodiments provide an organic light-emitting device and an electronic apparatus including the organic light-emitting device. The organic light-emitting device includes a first electrode, a second electrode facing the first electrode, m light-emitting units stacked between the first electrode and the second electrode and each including an emission layer, and m?1 charge generation layers between adjacent ones of the m light-emitting units, wherein m is an integer of 2 or more, at least one of the emission layers of the light-emitting units includes a first emission layer and a second emission layer, the first emission layer includes a first host, a second host, a first dopant, and a second dopant, the second emission layer includes a third host and a third dopant.
    Type: Application
    Filed: June 15, 2023
    Publication date: May 9, 2024
    Applicant: Samsung Display Co., LTD.
    Inventors: Tsuyoshi Naijo, Yunjee Park, Sungsoo Bae, Hojung Syn, Hyosup Shin, Jiyoung Lee, Changwoong Chu
  • Publication number: 20240023367
    Abstract: An organic light-emitting display apparatus including; a first pixel electrode, a second pixel electrode, a third pixel electrode; a first lower functional layer, a second lower functional layer, and a third lower functional layer; a first organic emission layer for emitting a first color, a second organic emission layer for emitting a second color, and a third organic emission layer for emitting a third color; an opposite electrode; and a first upper functional layer, a second upper functional layer, and a third upper functional layer respectively disposed between the opposite electrode and the first organic emission layer, the second organic emission layer, and the third organic emission layer and each having a thickness that is equal to or greater than about 1300 ? and less than or equal to about 1800 ?.
    Type: Application
    Filed: July 24, 2023
    Publication date: January 18, 2024
    Applicant: Samsung Display Co., Ltd.
    Inventors: Sungwook Kim, Kyungsik Kim, Seulong Kim, Tsuyoshi Naijo, Sungsoo Bae, Dongchan Lee, Hyein Jeong, Hyewon Choi, Seungjin Chu, Jaeweon Hur
  • Publication number: 20230413592
    Abstract: A light emitting element includes: a first electrode, a second electrode facing the first electrode, a first light emitting layer between the first electrode and the second electrode to emit a first light, a second light emitting layer between the first light emitting layer and the second electrode to emit a second light, and an intermediate layer including a host material between the first light emitting layer and the second light emitting layer and, wherein the intermediate layer has a thickness of from about 90 nm to 170 nm.
    Type: Application
    Filed: August 14, 2023
    Publication date: December 21, 2023
    Inventors: SUNGWOOK KIM, Kyungsik KIM, SeulOng KIM, TSUYOSHI NAIJO, SUNG-SOO BAE, Dongchan LEE, HYEIN JEONG, Hyewon CHOI, Seung-Jin CHU, Jaeweon HUR
  • Patent number: 11832467
    Abstract: A light-emitting device including a first electrode; a second electrode facing the first electrode; and interlayer arranged between the first electrode and the second electrode and including an emission layer, wherein the emission layer includes a first emission layer and a second emission layer, the first emission layer includes a first dopant, wherein the second dopant is an electron-trapping dopant, and the second emission layer includes a third dopant and a fourth dopant, wherein the fourth dopant is a hole-trapping dopant.
    Type: Grant
    Filed: April 6, 2021
    Date of Patent: November 28, 2023
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Hyosup Shin, Tsuyoshi Naijo, Hyunyoung Kim, Dongyoun Yoo, Jiyoung Lee
  • Patent number: 11778844
    Abstract: A light emitting element includes: a first electrode, a second electrode facing the first electrode, a first light emitting layer between the first electrode and the second electrode to emit a first light, a second light emitting layer between the first light emitting layer and the second electrode to emit a second light, and an intermediate layer including a host material between the first light emitting layer and the second light emitting layer and, wherein the intermediate layer has a thickness of from about 90 nm to 170 nm.
    Type: Grant
    Filed: June 15, 2020
    Date of Patent: October 3, 2023
    Assignee: Samsung Display Co., Ltd.
    Inventors: Sungwook Kim, Kyungsik Kim, SeulOng Kim, Tsuyoshi Naijo, Sung-Soo Bae, Dongchan Lee, Hyein Jeong, Hyewon Choi, Seung-Jin Chu, Jaeweon Hur
  • Patent number: 11758760
    Abstract: An organic light-emitting display apparatus including; a first pixel electrode, a second pixel electrode, a third pixel electrode; a first lower functional layer, a second lower functional layer, and a third lower functional layer; a first organic emission layer for emitting a first color, a second organic emission layer for emitting a second color, and a third organic emission layer for emitting a third color; an opposite electrode; and a first upper functional layer, a second upper functional layer, and a third upper functional layer respectively disposed between the opposite electrode and the first organic emission layer, the second organic emission layer, and the third organic emission layer and each having a thickness that is equal to or greater than about 1300 ? and less than or equal to about 1800 ?.
    Type: Grant
    Filed: August 31, 2022
    Date of Patent: September 12, 2023
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Sungwook Kim, Kyungsik Kim, Seulong Kim, Tsuyoshi Naijo, Sungsoo Bae, Dongchan Lee, Hyein Jeong, Hyewon Choi, Seungjin Chu, Jaeweon Hur
  • Publication number: 20230225207
    Abstract: Embodiments provide a condensed cyclic compound, a light-emitting device including the condensed cyclic compound, and an electronic apparatus including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and including an emission layer; and the condensed cyclic compound. The condensed cyclic compound is represented by Formula 1: The description of Formula 1 is provided in the specification.
    Type: Application
    Filed: January 10, 2023
    Publication date: July 13, 2023
    Applicant: Samsung Display Co., Ltd.
    Inventors: Jiyoung LEE, Tsuyoshi NAIJO, Jangyeol BAEK, Hyosup SHIN
  • Publication number: 20230225144
    Abstract: An organic light-emitting device includes a mixed layer, an emission layer, and a buffer layer and satisfies one of Equation 1 or Equation 2 and Equation 3: T1(D)?T1(Mix)+0.3 eV??Equation 1 T1(H)?T1(Mix)+0.3 eV??Equation 2 T1(Mix)<T1(Buffer)+0.5 eV.
    Type: Application
    Filed: March 6, 2023
    Publication date: July 13, 2023
    Inventors: Seungjin Chu, Kyungsik Kim, Sungwook Kim, Seulong Kim, Tsuyoshi NAIJO, Yunjee Park, Sungsoo Bae, Dongchan Lee, Hyewon Choi, Jaeweon Hur
  • Publication number: 20230138754
    Abstract: A light emitting element includes a first electrode, a second electrode disposed on the first electrode, and an emission layer disposed between the first electrode and the second electrode. The emission layer includes a hole transporting host, an electron transporting host, a phosphorescent sensitizer, and a fluorescent dopant, wherein the fluorescent dopant emits light having a full width at half maximum (FWHM) equal to or less than about 20 nm. The fluorescent dopant may include a compound represented by Formula 1. Accordingly, the light emitting element according to an embodiment may exhibit enhanced color purity and long service life characteristics.
    Type: Application
    Filed: July 5, 2022
    Publication date: May 4, 2023
    Applicant: Samsung Display Co., Ltd.
    Inventors: JIYOUNG LEE, TSUYOSHI NAIJO, JANG YEOL BAEK, HYOSUP SHIN
  • Publication number: 20230127039
    Abstract: A light emitting element includes a first electrode, a second electrode disposed on the first electrode, and an emission layer disposed between the first electrode and the second electrode. The emission layer may include a hole transporting host, an electron transporting host, a phosphorescent sensitizer, and a delayed fluorescent dopant. The delayed fluorescent dopant may have a greater absolute value of the HOMO energy level than the hole transporting host. Accordingly, the light emitting element including the delayed fluorescent dopant in an embodiment may exhibit long lifespan.
    Type: Application
    Filed: August 16, 2022
    Publication date: April 27, 2023
    Inventors: TSUYOSHI NAIJO, HYOSUP SHIN, JIYOUNG LEE
  • Patent number: 11626566
    Abstract: An organic light-emitting device includes a mixed layer, an emission layer, and a buffer layer and satisfies one of Equation 1 or Equation 2 and Equation 3: T1(D)?T1(Mix)+0.3 eV??Equation 1 T1(H)?T1(Mix)+0.3 eV??Equation 2 T1(Mix)<T1(Buffer)+0.5 eV.
    Type: Grant
    Filed: August 18, 2020
    Date of Patent: April 11, 2023
    Assignee: Samsung Display Co., Ltd.
    Inventors: Seungjin Chu, Kyungsik Kim, Sungwook Kim, Seulong Kim, Tsuyoshi Naijo, Yunjee Park, Sungsoo Bae, Dongchan Lee, Hyewon Choi, Jaeweon Hur