Patents by Inventor Keiko Albessard

Keiko Albessard 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: 20140175971
    Abstract: The embodiment of the present disclosure provides a light-emitting device capable of both realizing neutral white color and having high luminous efficiency. The device has a blue-light emitting semi-conductor element and a luminescent layer containing a mixture of fluorescent substances. The mixture contains first and second phosphors. The first phosphor is activated with Ce and emits luminescence with a peak wavelength of 540 to 560 nm, and the second phosphor emits luminescence with a peak wavelength of 580 to 610 nm and is represented by the following formula (2): (Sr1-x2Eux2) Sia2Alb2Oc2Nd2Ce2 ??(2).
    Type: Application
    Filed: December 19, 2013
    Publication date: June 26, 2014
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Naotoshi MATSUDA, Yasushi Hattori, Yumi Fukuda, Iwao Mitsuishi, Keiko Albessard
  • Patent number: 8569943
    Abstract: According to one embodiment, the luminescent material emits light having an luminescence peak within a wavelength range of 550 to 590 nm when excited with light having an emission peak in a wavelength range of 250 to 520 nm. The luminescent material has a composition represented by the following formula 1. (Sr1-xEux)aSibAlOcNd??formula 1 wherein x, a, b, c and d satisfy following condition: 0<x?0.16, 0.50?a?0.70, 2.0?b?2.5 0.45?c?1.2, 3.5?d?4.5, and 3.6?d/c?8.0.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: October 29, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Iwao Mitsuishi, Naotoshi Matsuda, Yumi Fukuda, Keiko Albessard, Aoi Okada, Masahiro Kato, Ryosuke Hiramatsu, Yasushi Hattori, Shinya Nunoue
  • Patent number: 8558251
    Abstract: A light emitting device according to one embodiment includes a board; plural first light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; plural second light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; a first fluorescent layer formed on each of the first light emitting elements, the first fluorescent layer including a first phosphor; and a second fluorescent layer formed on each of the second light emitting elements, the second fluorescent layer including a second phosphor. The second phosphor is higher than the first phosphor in luminous efficiency at 50° C., and is lower than the first phosphor in the luminous efficiency at 150° C.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: October 15, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Iwao Mitsuishi, Yumi Fukuda, Aoi Okada, Ryosuke Hiramatsu, Naotoshi Matsuda, Shinya Nunoue, Keiko Albessard, Masahiro Kato
  • Patent number: 8546824
    Abstract: A light emitting device according to one embodiment includes: a board; plural first light emitting units each including a first light emitting element and a first fluorescent layer formed on the first light emitting element having a green phosphor; plural second light emitting units each including a second light emitting element and a second fluorescent layer formed on the second light emitting element having a red phosphor; the second fluorescent layers and the first fluorescent layers being separated in a non-contact manner with gas interposed there between; and plural third light emitting units each including a third light emitting element and a resin layer formed on the third light emitting element having neither a green phosphor nor the red phosphor, the third light emitting units being disposed between the first light emitting units and the second light emitting units.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: October 1, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Iwao Mitsuishi, Yumi Fukuda, Aoi Okada, Naotoshi Matsuda, Shinya Nunoue, Keiko Albessard, Masahiro Kato
  • Publication number: 20130241387
    Abstract: According to one embodiment, the luminescent material exhibits a luminescence peak in a wavelength ranging from 500 to 600 nm when excited with light having an emission peak in a wavelength ranging from 250 to 500 nm. The luminescent material has a composition represented by Formula 1 below: (M1-xCex)2yAlzSi10-zOuNw??Formula 1 wherein M represents Sr and a part of Sr may be substituted by at least one selected from Ba, Ca, and Mg; x, y, z, u, and w satisfy following conditions: 0<x?1, 0.8?y?1.1, 2?z?3.5, u?1 1.8?z?u, and 13?u+w?15.
    Type: Application
    Filed: August 31, 2012
    Publication date: September 19, 2013
    Inventors: Yumi FUKUDA, Iwao Mitsuishi, Keiko Albessard
  • Publication number: 20130241395
    Abstract: The present embodiments provide a europium-activated oxynitride phosphor and a production method thereof. This phosphor emits red luminescence having a peak at 630 nm or longer and can be produced by use of inexpensive oxides as raw materials containing alkaline earth metals such as strontium. The oxynitride phosphor is activated by a divalent europium and represented by the formula (1): (M1-xEux)AlaSibOcNdCe ??(1). In the formula, M is an alkaline earth metal, and x, a, b, c, d and e are numbers satisfying the conditions of 0<x<0.2, 1.3?a?1.8, 3.5?b?4, 0.1?c?0.3, 6.7?d?7.2 and 0.01?3?0.1, respectively.
    Type: Application
    Filed: September 11, 2012
    Publication date: September 19, 2013
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Naotoshi Matsuda, Yumi Fukuda, Keiko Albessard, Masahiro Kato, Iwao Mitsuishi
  • Publication number: 20130234585
    Abstract: According to one embodiment, the luminescent material shows a luminescence peak in a wavelength range of 570 to 670 nm when excited with light having an emission peak in a wavelength range of 250 to 520 nm. The luminescent material includes a host material having a crystal structure substantially same as the crystal structure of Sr2Si7Al3ON13. The host material is activated by Eu, and includes Sr and Ca to satisfy a relationship of 0.008?MCa/(MSr+MCa)?0.114, where MCa is a number of moles of Ca and MSr is a number of moles of Sr.
    Type: Application
    Filed: August 31, 2012
    Publication date: September 12, 2013
    Inventors: Keiko Albessard, Masahiro Kato, Yumi Fukuda, Iwao Mitsuishi, Takahiro Sato, Shigeya Kimura, Aoi Okada, Naotoshi Matsuda, Ryosuke Hiramatsu, Yasushi Hattori, Kunio Ishida, Hironori Asai
  • Publication number: 20130229106
    Abstract: According to one embodiment, the luminescent material emits light having an luminescence peak within a wavelength range of 550 to 590 nm when excited with light having an emission peak in a wavelength range of 250 to 520 nm. The luminescent material has a composition represented by the following formula 1. (Sr1-xEux)aSibAlOcNd??formula 1 wherein x, a, b, c and d satisfy following condition: 0<x?0.16, 0.50?a?0.70, 2.0?b?2.5 0.45?c?1.2, 3.5?d?4.5, and 3.6?d/c?8.0.
    Type: Application
    Filed: August 31, 2012
    Publication date: September 5, 2013
    Inventors: Iwao MITSUISHI, Naotoshi MATSUDA, Yumi FUKUDA, Keiko ALBESSARD, Aoi OKADA, Masahiro KATO, Ryosuke HIRAMATSU, Yasushi HATTORI, Shinya NUNOUE
  • Patent number: 8471277
    Abstract: A light emitting device according to one embodiment includes a light emitting element that emits light having a wavelength of 380 nm to 470 nm; a CASN first red phosphor that is disposed on the light emitting element; a sialon second red phosphor that is disposed on the light emitting element; and a sialon green phosphor that is disposed on the light emitting element.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: June 25, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Iwao Mitsuishi, Shinya Nunoue, Takahiro Sato, Yumi Fukuda, Aoi Okada, Naotoshi Matsuda, Toshiki Hikosaka, Keiko Albessard, Masahiro Kato
  • Patent number: 8436527
    Abstract: A light emitting device includes a board and a light emitting element mounted on the board, emitting light having a wavelength of 250 nm to 500 nm. A red fluorescent layer is formed on the element and includes a red phosphor (M1?x1Eux1)aSibAlOcNd having a semicircular shape with a radius r, where M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Aluminum, rare-earth elements, and IVB group elements. An intermediate layer is formed on the red fluorescent layer, being made of transparent resin, having a semicircular shape with a radius D; and a green fluorescent layer is formed on the intermediate layer, including a green phosphor, having a semicircular shape. A relationship between the radius r and the radius D is 2.0r(?m)?D?(r+1000)(?m).
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: May 7, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Iwao Mitsuishi, Kunio Ishida, Yumi Fukuda, Aoi Okada, Naotoshi Matsuda, Keiko Albessard, Shinya Nunoue
  • Publication number: 20130044473
    Abstract: A light emitting device according to embodiments has: a substrate; first light emitting units arranged along a first straight line on the substrate; second light emitting units arranged along a second straight line on the substrate, the second straight line being parallel to the first straight line, the second light emitting units having an emission color different from the first light emitting units; and third light emitting units arranged along a third straight line on the substrate, the third straight line being parallel to the first and second straight lines, the third light emitting units having an emission color different from the first and second light emitting units, wherein a distance between light emitting units of a same emission color is longer than a minimum distance between light emitting units of different emission colors.
    Type: Application
    Filed: February 27, 2012
    Publication date: February 21, 2013
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Yasushi Hattori, Iwao Mitsuishi, Naotoshi Matsuda, Masahiro Kato, Kunio Ishida, Yumi Fukuda, Ryosuke Hiramatsu, Keiko Albessard, Aoi Okada
  • Patent number: 8278821
    Abstract: A light emitting device according to one embodiment includes a light emitting element that emits light having a wavelength of 250 nm to 500 nm; plural red fluorescent layers that are formed above the light emitting element to include a red fluorescent material, the red fluorescent layers being disposed at predetermined intervals; and plural green fluorescent layers that are formed above the light emitting element to include a green fluorescent material, a distance between the light emitting element and the green fluorescent layers being larger than a distance between the light emitting element and the red fluorescent layers.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: October 2, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kunio Ishida, Iwao Mitsuishi, Ryosuke Hiramatsu, Yumi Fukuda, Keiko Albessard, Naotoshi Matsuda, Aoi Okada, Shinya Nunoue
  • Publication number: 20120062106
    Abstract: The embodiment provides a red light-emitting fluorescent substance represented by the following formula (1): (M1-xECx)aM1bAlOcNd ??(1). In the formula (1), M is an element selected from the group consisting of IA group elements, IIA group elements, IIIA group elements, IIIB group elements, rare earth elements and IVA group elements; EC is an element selected from the group consisting of Eu, Ce, Mn, Tb, Yb, Dy, Sm, Tm, Pr, Nd, Pm, Ho, Er, Cr, Sn, Cu, Zn, As, Ag, Cd, Sb, Au, Hg, Tl, Pb, Bi and Fe; M1 is different from M and is selected from the group consisting of tetravalent elements; and x, a, b, c and d are numbers satisfying the conditions of 0<x<0.2, 0.55<a<0.80, 2.10<b<3.90, 0<c?0.25 and 4<d<5, respectively. This substance emits luminescence having a peak in the wavelength range of 620 to 670 nm when excited by light of 250 to 500 nm.
    Type: Application
    Filed: August 30, 2011
    Publication date: March 15, 2012
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Aoi OKADA, Yumi Fukuda, Naotoshi Matsuda, Iwao Mitsuishi, Shinya Nunoue, Keiko Albessard, Masahiro Kato
  • Publication number: 20120056527
    Abstract: A light emitting device according to one embodiment includes a board; a light emitting element mounted on the board, emitting light having a wavelength of 250 nm to 500 nm; a red fluorescent layer formed on the element, including a red phosphor expressed by equation (1), having a semicircular shape with a diameter r; (M1?x1Eux1)aSibAlOcNd??(1) (In the equation (1), M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Al (Aliminum), rare-earth elements, and IVB group elements), an intermediate layer formed on the red fluorescent layer, being made of transparent resin, having a semicircular shape with a diameter D; and a green fluorescent layer formed on the intermediate layer, including a green phosphor, having a semicircular shape. A relationship between the diameter r and the diameter D satisfies equation (2): 2.0r (?m)?D(r+1000) (?m).
    Type: Application
    Filed: February 24, 2011
    Publication date: March 8, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Iwao MITSUISHI, Kunio ISHIDA, Yumi FUKUDA, Aoi OKADA, Naotoshi MATSUDA, Keiko ALBESSARD, Shinya NUNOUE
  • Publication number: 20120056216
    Abstract: A light emitting device according to one embodiment includes: a board; plural first light emitting units each including a first light emitting element and a first fluorescent layer formed on the first light emitting element having a green phosphor; plural second light emitting units each including a second light emitting element and a second fluorescent layer formed on the second light emitting element having a red phosphor; the second fluorescent layers and the first fluorescent layers being separated in a non-contact manner with gas interposed there between; and plural third light emitting units each including a third light emitting element and a resin layer formed on the third light emitting element having neither a green phosphor nor the red phosphor, the third light emitting units being disposed between the first light emitting units and the second light emitting units.
    Type: Application
    Filed: August 22, 2011
    Publication date: March 8, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Iwao MITSUISHI, Yumi FUKUDA, Aoi OKADA, Naotoshi MATSUDA, Shinya NUNOUE, Keiko ALBESSARD, Masahiro KATO
  • Publication number: 20120056209
    Abstract: A light emitting device according to one embodiment includes a board; plural first light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; plural second light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; a first fluorescent layer formed on each of the first light emitting elements, the first fluorescent layer including a first phosphor; and a second fluorescent layer formed on each of the second light emitting elements, the second fluorescent layer including a second phosphor. The second phosphor is higher than the first phosphor in luminous efficiency at 50° C., and is lower than the first phosphor in the luminous efficiency at 150° C.
    Type: Application
    Filed: August 22, 2011
    Publication date: March 8, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Iwao MITSUISHI, Yumi Fukuda, Aoi Okada, Ryosuke Hiramatsu, Naotoshi Matsuda, Shinya Nunoue, Keiko Albessard, Masahiro Kato
  • Publication number: 20120056224
    Abstract: A light emitting device according to one embodiment includes a light emitting element that emits light having a wavelength of 380 nm to 470 nm; a CASN first red phosphor that is disposed on the light emitting element; a sialon second red phosphor that is disposed on the light emitting element; and a sialon green phosphor that is disposed on the light emitting element.
    Type: Application
    Filed: August 22, 2011
    Publication date: March 8, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Iwao MITSUISHI, Shinya Nunoue, Takahiro Sato, Yumi Fukuda, Aoi Okada, Naotoshi Matsuda, Toshiki Hikosaka, Keiko Albessard, Masahiro Kato
  • Publication number: 20120056225
    Abstract: A light emitting device according to one embodiment includes a board; a light emitting element mounted on the board, emitting light having a wavelength of 250 nm to 500 nm; a red fluorescent layer formed on the element, including a red phosphor expressed by equation (1), having a semicircular shape with a diameter r; (M1?x1Eux1)aSibAlOcNd??(1) (In the equation (1), M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Al (Aliminum), rare-earth elements, and IVB group elements), an intermediate layer formed on the red fluorescent layer, being made of transparent resin, having a semicircular shape with a diameter D; and a green fluorescent layer formed on the intermediate layer, including a green phosphor, having a semicircular shape. A relationship between the diameter r and the diameter D satisfies equation (2): 2.0r(?m)?D?(r+1000)(?m).
    Type: Application
    Filed: August 22, 2011
    Publication date: March 8, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Iwao MITSUISHI, Kunio Ishida, Yumi Fukuda, Aoi Okada, Naotoshi Matsuda, Keiko Albessard, Shinya Nunoue, Masahiro Kato
  • Publication number: 20120056525
    Abstract: A light emitting device according to one embodiment includes a light emitting element that emits light having a wavelength of 250 nm to 500 nm; plural red fluorescent layers that are formed above the light emitting element to include a red fluorescent material, the red fluorescent layers being disposed at predetermined intervals; and plural green fluorescent layers that are formed above the light emitting element to include a green fluorescent material, a distance between the light emitting element and the green fluorescent layers being larger than a distance between the light emitting element and the red fluorescent layers.
    Type: Application
    Filed: February 24, 2011
    Publication date: March 8, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kunio ISHIDA, Iwao MITSUISHI, Ryosuke HIRAMATSU, Yumi FUKUDA, Keiko ALBESSARD, Naotoshi MATSUDA, Aoi OKADA, Shinya NUNOUE
  • Publication number: 20120043573
    Abstract: A light emitting device according to one embodiment includes a light emitting element that emits light having a wavelength of 250 nm to 500 nm and a fluorescent layer that is disposed on the light emitting element. The fluorescent layer includes a phosphor having a composition expressed by the following equation (1) and an average particle diameter of 12 ?m or more. (M1?x1Eux1)3?ySi13?zAl3+zO2+uN21?w??(1) (In the equation (1), M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Al, rare-earth elements, and IVB group elements. x1, y, z, u, and w satisfy the following relationship. 0<x1<1, ?0.1<y<0.3, ?3<z?1, ?3<u?w?1.
    Type: Application
    Filed: August 22, 2011
    Publication date: February 23, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Iwao MITSUISHI, Yumi FUKUDA, Aoi OKADA, Naotoshi MATSUDA, Shinya NUNOUE, Keiko ALBESSARD, Masahiro KATO