Patents by Inventor Kunimasa Hiyama

Kunimasa Hiyama 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).

  • Patent number: 9780322
    Abstract: An organic electroluminescent element includes a hole injection layer (HI), a first hole transport layer (HT1), a second hole transport layer (HT2), and a light-emitting layer containing a host compound (H) and a phosphorescence emitting dopant compound (D), which are laminated in this order, between and an anode and a cathode. The phosphorescence emitting dopant compound has a partial structure represented by Formula (1): The “highest occupied molecular orbital” HOMO of the second hole transport layer satisfies the expression: ?5.4<HOMO (HT2)<?4.8; and the relationship of triplet excitation energies (T1) between the phosphorescence emitting dopant compound and a hole transport material contained in the second hole transport layer satisfies the expression: T1 (HT2)?T1 (D)>0.1.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: October 3, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Kunio Tani, Eisaku Katoh, Hiroto Ito, Kunimasa Hiyama
  • Patent number: 9541681
    Abstract: Disclosed is a novel light extraction sheet, which not only improves light extraction efficiency but suppresses color change with the angle of observation, an organic EL element employing this light extraction sheet, and an illumination device employing the element. The light extraction sheet is featured in that it comprises a transparent resin film and provided thereon, a light scatter layer containing a binder resin and light scattering particles with an average particle size of front 0.2 to 1.0 ?m dispersed in the binder resin and a concavo-convex layer containing a binder resin and spherical particles with an average particle size of from 3 to 10 ?m.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: January 10, 2017
    Assignee: KONICA MINOLTA HOLDINGS, INC.
    Inventors: Yasuo Taima, Kunimasa Hiyama
  • Patent number: 9006711
    Abstract: Disclosed is a white light-emitting organic electroluminescent device, which is excellent in stability of emission chromaticity over a long operation period, while having high electrical efficiency, long life, excellent storage stability and excellent color rendering properties. Also disclosed is an illuminating device using such an organic electroluminescent device. Specifically disclosed is an organic electroluminescent device having a light-emitting layer between an anode and a cathode, which is characterized by comprising a light-emitting layer A having a maximum emission wavelength of not more than 480 nm and containing a phosphorescent dopant having a maximum emission wavelength of not more than 480 nm, and a light-emitting layer B arranged between the light-emitting layer A and the anode, which has a maximum emission wavelength of not less than 510 nm and contains a phosphorescent dopant.
    Type: Grant
    Filed: April 4, 2008
    Date of Patent: April 14, 2015
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Yoriko Nakayama, Tomoyuki Nakayama, Kunimasa Hiyama, Shigeru Kojima
  • Patent number: 8987711
    Abstract: Provided is an organic electroluminescence element containing a light transmissive base material laminated thereon a transparent electrode, a light emitting layer and a counter electrode in this order, wherein the light transmissive base material contains a light transmissive resin substrate (resin substrate B) provided with a hard coat layer on both surfaces of the light transmissive resin substrate, the hard coat layers containing metal oxide nano particles; and the transparent electrode is formed on one hard coat layer (H1); and a rugged structure is formed on one surface of the other hard coat layer (H2), the one surface being opposite to another surface of the other hard coat layer (H2) which is contacted with the light transmissive resin substrate (resin substrate B).
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: March 24, 2015
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Kunimasa Hiyama, Toshiya Kondo, Takeshi Ono
  • Publication number: 20140339529
    Abstract: An organic electroluminescent element includes a hole injection layer (HI), a first hole transport layer (HT1), a second hole transport layer (HT2), and a light-emitting layer containing a host compound (H) and a phosphorescence emitting dopant compound (D), which are laminated in this order, between and an anode and a cathode. The phosphorescence emitting dopant compound has a partial structure represented by Formula (1): The “highest occupied molecular orbital” HOMO of the second hole transport layer satisfies the expression: ?5.4<HOMO (HT2)<?4.8; and the relationship of triplet excitation energies (T1) between the phosphorescence emitting dopant compound and a hole transport material contained in the second hole transport layer satisfies the expression: T1(HT2)?T1(D)>0.1.
    Type: Application
    Filed: October 2, 2012
    Publication date: November 20, 2014
    Applicant: Konica Minolta, Inc.
    Inventors: Kunio Tani, Eisaku Katoh, Hiroto Ito, Kunimasa Hiyama
  • Publication number: 20140220721
    Abstract: Provided is a white light-emitting organic EL element wherein a flexible plastic substrate is used, but the resistance to negative effects caused by the flexibility is excellent; a removal of a light emitting layer interface caused by folding the element and a contact failure do not tend to occur; and the drive voltage can be reduced. The white light-emitting organic EL element is formed by providing at least two layers, i.e., a light emitting layer and a light emitting layer on the plastic substrate.
    Type: Application
    Filed: February 7, 2014
    Publication date: August 7, 2014
    Applicant: KONICA MINOLTA INC
    Inventors: Yasunobu KOBAYASHI, Kunimasa HIYAMA
  • Patent number: 8686630
    Abstract: Disclosed are an organic electroluminescence element with significantly improved light extraction efficiency and improved film properties and an illumination device that uses said element. The organic electroluminescence element has a transparent electrode, an organic electroluminescence layer, and a cathode sequentially stacked on a transparent base material. The element is characterized in that the transparent base material is a transparent resin film, there is a hard coat layer on both sides, the respective refractive indices satisfy the expressions (1)-(4), and there is a function to scatter light to the light emission side with respect to the organic electroluminescence layer. Expression (1): ?0.2?n(H1)?n(A)?0.2, Expression (2): ?0.1?n(H1)?n(B)?0.1, Expression (3): ?0.1?n(H2)?n(B)?0.1, Expression (4): ?0.1?n(H1)?n(H2)?0.1.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: April 1, 2014
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Kunimasa Hiyama, Yasuo Taima, Takeshi Ono
  • Patent number: 8569087
    Abstract: Provided is a manufacturing method by which each functional layer of various types of organic electronic elements can be uniformly formed by wet process. Specifically, a method for manufacturing an organic electronic element which uniformly emits light with high emission efficiency is provided. The method for manufacturing the organic electronic element includes a step of forming a functional layer by laminating at least an organic layer (A) and an organic layer (B) in this order on a substrate. After forming at least the organic layer (A), the organic layer (B) is applied and formed on the organic layer (A) by using a fluorine-containing solvent.
    Type: Grant
    Filed: November 11, 2008
    Date of Patent: October 29, 2013
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Shigeru Kojima, Kunimasa Hiyama, Hideo Taka
  • Patent number: 8518556
    Abstract: Provided is an organic electroluminescence element which is driven with a reduced drive voltage without deteriorating emission luminance and has a high power efficiency. The organic electroluminescence element having at least one light emitting layer is characterized in that two or more types of light emitting dopants having different emission colors are included in at least one light emitting layer, the concentration of all the light emitting dopants included in the light emitting layer is 5 Vol % or more, and the concentration of the light emitting dopant giving a main emission color among the light emitting dopants in the light emitting layer is 2 Vol % or less.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: August 27, 2013
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Yoriko Nakayama, Hiroshi Kashiwagi, Hiroyuki Hashimoto, Kunimasa Hiyama
  • Patent number: 8518558
    Abstract: An organic electroluminescent element having at least an anode, a cathode, and a light-emitting layer held between the anode and the cathode on a substrate and emitting white light. The light-emitting layer consists of three or less layers, the light-emitting material contained entirely in the light-emitting layer consists of at least four kinds of light-emitting material having different emission maximum wavelengths (?max). The four kinds of light emitting material have emission colors of blue, green, yellow red and red, and since one or more layers out of the three or less layers of the light-emitting layer contain two or more kinds of light-emitting material simultaneously, there is obtained an organic electroluminescent element excellent in color rendering and exhibiting high power efficiency in which variation in emission color is small even if current density varies.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: August 27, 2013
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Kunimasa Hiyama, Shigeru Kojima
  • Publication number: 20130062654
    Abstract: Disclosed is a novel light extraction sheet which not only improves light extraction efficiency but suppresses color change with the angle of observation, an organic EL dement employing this light extraction sheet, and art illumination device employing the element. The light extraction sheet is featured in that it comprises a transparent resin film and provided thereon, a light scatter layer containing a binder resin and light scattering particles with an average particle size of front 0.2 to 1.0 ?m dispersed in the binder resin and a concavo-convex layer containing a binder resin and spherical particles with an. average particle size of from 3 to 10 ?m.
    Type: Application
    Filed: May 17, 2011
    Publication date: March 14, 2013
    Applicant: KONICA MINOLTA HOLDINGS, INC.
    Inventors: Yasuo Taima, Kunimasa Hiyama
  • Patent number: 8304764
    Abstract: The present invention provides a white organic electroluminescent element which can emits white light and is free from deviation of chromaticity. This organic electroluminescent element comprises a substrate and, provided on the substrate, at least an anode, a cathode, and a light emitting layer held between the anode and the cathode. This organic electroluminescent element is characterized in that the light emitting layer contains at least three types of light emitting materials different from each other in ? max, and the absolute value of HOMO level of the light emitting material having the shortest wavelength is smaller than the absolute value of HOMO level of the other light emitting materials.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: November 6, 2012
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Takeshi Ono, Kunimasa Hiyama, Shigeru Kojima
  • Publication number: 20120228601
    Abstract: Provided is an organic electroluminescence element containing a light transmissive base material laminated thereon a transparent electrode, a light emitting layer and a counter electrode in this order, wherein the light transmissive base material contains a light transmissive resin substrate (resin substrate B) provided with a hard coat layer on both surfaces of the light transmissive resin substrate, the hard coat layers containing metal oxide nano particles; and the transparent electrode is formed on one hard coat layer (H1); and a rugged structure is formed on one surface of the other hard coat layer (H2), the one surface being opposite to another surface of the other hard coat layer (H2) which is contacted with the light transmissive resin substrate (resin substrate B).
    Type: Application
    Filed: November 18, 2010
    Publication date: September 13, 2012
    Applicant: KONICA MINOLTA HOLDINGS, INC.
    Inventors: Kunimasa Hiyama, Toshiya Kondo, Takeshi Ono
  • Publication number: 20120086331
    Abstract: Provided is a white light-emitting organic EL element wherein a flexible plastic substrate is used, but the resistance to negative effects caused by the flexibility is excellent; a removal of a light emitting layer interface caused by folding the element and a contact failure do not tend to occur, and the drive voltage can be reduced. The white light-emitting organic EL element is formed by providing at least two layers, i.e., a light emitting layer (A) and a light emitting layer (B) on the plastic substrate.
    Type: Application
    Filed: June 17, 2010
    Publication date: April 12, 2012
    Applicant: KONICA MINOLTA HOLDINGS, INC.
    Inventors: Yasunobu Kobayashi, Kunimasa Hiyama
  • Publication number: 20110279024
    Abstract: Disclosed are an organic electroluminescence element with significantly improved light extraction efficiency and improved film properties and an illumination device that uses said element. The organic electroluminescence element has a transparent electrode, an organic electroluminescence layer, and a cathode sequentially stacked on a transparent base material. The element is characterized in that the transparent base material is a transparent resin film, there is a hard coat layer on both sides, the respective refractive indices satisfy the expressions (1)-(4), and there is a function to scatter light to the light emission side with respect to the organic electroluminescence layer. Expression (1): ?0.2?n(H1)?n(A)?0.2, Expression (2): ?0.1?n(H1)?n(B)?0.1, Expression (3): ?0.1?n(H2)?n(B)?0.1, Expression (4): ?0.1?n(H1)?n(H2)?0.1.
    Type: Application
    Filed: February 3, 2010
    Publication date: November 17, 2011
    Applicant: KONICA MINOLTA HOLDINGS, INC.
    Inventors: Kunimasa Hiyama, Yasuo Taima, Takeshi Ono
  • Publication number: 20110084601
    Abstract: Disclosed is a coating type organic EL element having excellent chromaticity stability to driving current, excellent chromaticity stability during continuous driving and excellent color rendering property.
    Type: Application
    Filed: June 26, 2009
    Publication date: April 14, 2011
    Applicant: KONICA MINOLTA HOLDINGS, INC.
    Inventors: Yoriko Nakayama, Toshihiko Iwasaki, Kunimasa Hiyama
  • Publication number: 20100267180
    Abstract: Provided is a manufacturing method by which each functional layer of various types of organic electronic elements can be uniformly formed by wet process. Specifically, a method for manufacturing an organic electronic element which uniformly emits light with high emission efficiency is provided. The method for manufacturing the organic electronic element includes a step of forming a functional layer by laminating at least an organic layer (A) and an organic layer (B) in this order on a substrate. After forming at least the organic layer (A), the organic layer (B) is applied and formed on the organic layer (A) by using a fluorine-containing solvent.
    Type: Application
    Filed: November 11, 2008
    Publication date: October 21, 2010
    Applicant: KONICA MINOLTA HOLDINGS, INC.
    Inventors: Shigeru Kojima, Kunimasa Hiyama, Hideo Taka
  • Publication number: 20100244007
    Abstract: The present invention provides a white organic electroluminescent element which can emits white light and is free from deviation of chromaticity. This organic electroluminescent element comprises a substrate and, provided on the substrate, at least an anode, a cathode, and a light emitting layer held between the anode and the cathode. This organic electroluminescent element is characterized in that the light emitting layer contains at least three types of light emitting materials different from each other in X max, and the absolute value of HOMO level of the light emitting material having the shortest wavelength is smaller than the absolute value of HOMO level of the other light emitting materials.
    Type: Application
    Filed: October 27, 2008
    Publication date: September 30, 2010
    Applicant: KONICA MINOLTA HOLDINGS, INC.
    Inventors: Takeshi Ono, Kunimasa Hiyama, Shigeru Kojima
  • Publication number: 20100221547
    Abstract: Provided is an organic electroluminescence element which is driven with a reduced drive voltage without deteriorating emission luminance and has a high power efficiency. The organic electroluminescence element having at least one light emitting layer is characterized in that two or more types of light emitting dopants having different emission colors are included in at least one light emitting layer, the concentration of all the light emitting dopants included in the light emitting layer is 5 Vol % or more, and the concentration of the light emitting dopant giving a main emission color among the light emitting dopants in the light emitting layer is 2 Vol % or less.
    Type: Application
    Filed: December 21, 2006
    Publication date: September 2, 2010
    Applicant: KONICA MINOLTA HOLDINGS, INC.
    Inventors: Yoriko Nakayama, Hiroshi Kashiwagi, Hiroyuki Hashimoto, Kunimasa Hiyama
  • Patent number: 7745990
    Abstract: A white light-emitting organic electroluminescent element is disclosed, containing a substrate having thereon: an anode; a cathode; and a plurality of light emitting layers between the anode and the cathode, wherein the plurality of light emitting layers contains: a first light emitting layer which emits a light having a predetermined wavelength; a second light emitting layer which is located at a nearer position to the anode than the first light emitting layer and emits a light having a complementary color to the light having the predetermined wavelength; and a third light emitting layer which is located at a nearer position to the cathode than the first light emitting layer and emits the light having the complementary color to the light having the predetermined wavelength.
    Type: Grant
    Filed: March 18, 2008
    Date of Patent: June 29, 2010
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Toshiya Kondo, Tomoyuki Nakayama, Kunimasa Hiyama