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Short-wavelength light-emitting element arranged in a container with a window having a window board formed of a calcium fluoride crystals 実績あり

外国特許コード F110005731
整理番号 Y0366WO
掲載日 2011年9月12日
出願国 アメリカ合衆国
出願番号 16652305
公報番号 20060038194
公報番号 7696690
出願日 平成15年12月24日(2003.12.24)
公報発行日 平成18年2月23日(2006.2.23)
公報発行日 平成22年4月13日(2010.4.13)
国際出願番号 JP2003016617
国際公開番号 WO2004059750
国際出願日 平成15年12月24日(2003.12.24)
国際公開日 平成16年7月15日(2004.7.15)
優先権データ
  • 特願2002-375426 (2002.12.25) JP
  • 2003JP016617 (2003.12.24) WO
発明の名称 (英語) Short-wavelength light-emitting element arranged in a container with a window having a window board formed of a calcium fluoride crystals 実績あり
発明の概要(英語) A short-wavelength light-emitting element such as an ultraviolet light-emitting element or blue light-emitting element is arranged in a container which has a window with a window board formed of calcium fluoride crystals.
Fluoride crystals are ones which contain either metal or metal halide, or both of them.
In a production method of fluoride crystals in which the cavity of a crucible is filled with raw material powder and this crucible is heated in a vertical Bridgman furnace, a production method of fluoride crystals of the present invention is the one in which the shortest diameter of a cross section of the cavity of the crucible is small.
In a crucible, whose cavity is filled with raw material powder, heated in a vertical Bridgman furnace to produce fluoride crystals, a crucible is the one in which the shortest diameter of a section of the cavity is small.
従来技術、競合技術の概要(英語) BACKGROUND ART
In the past, in a light-emitting element device using a short-wavelength light-emitting element such as an ultraviolet light-emitting element or blue light-emitting element, this short-wavelength light-emitting element 1 such as an ultraviolet light-emitting element or blue light-emitting element has been covered, for example, with epoxy resin 2 as shown in FIG. 5.
Also, in a light-emitting element device which uses this short-wavelength light-emitting element 1 such as an ultraviolet light-emitting element or blue light-emitting element and is intended to obtain visible light through wavelength conversion, an element such as phosphorus has been mixed into this covering epoxy resin 2 so as to obtain yellow light.
Further, calcium fluoride crystals (fluorite) are generally known to be highly resistant to ultraviolet rays such as KrF and ArF excimer lasers (Published Japanese Patent Application No. 2001-33379).
However, this short-wavelength light-emitting element 1 such as an ultraviolet light-emitting element or blue light-emitting element is high in the energy of light, which thus decomposes couplings of the epoxy resin 2 or the like covering this short-wavelength light-emitting element 1 and causes devitrification.
As a result, regarding a light-emitting element device using this short-wavelength light-emitting element 1, there has been such inconvenience in which light-emitting efficiency lowers noticeably or similar effects are caused, as it is used.
Further, when in order to perform wavelength conversion in a light-emitting element device using this short-wavelength light-emitting element 1 an element such as phosphorus, for example, is mixed into the covering epoxy resin 2 to obtain a light-emitting element device emitting yellow light, with the energy of this short-wavelength light, the decomposition of the epoxy resin 2 progresses as it is used, light-emitting efficiency deteriorates, and this phosphorus atom becomes directly attached to the surface of wiring of a diode constituting this short-wavelength light-emitting element 1, corroding this wiring and causing an inconvenience in which reliability is lowered greatly.
Meanwhile, the development of calcium fluoride which is great in hardness, excellent in acid resistance, small in dislocation density, and small in strain amount is being hoped for.

特許請求の範囲(英語) [claim1]
1. A light-emitting element device comprising a short-wavelength light-emitting element arranged in a container which has a window with a window board formed of calcium fluoride crystals wherein said calcium fluoride crystals further comprise either a metal or a metal halide, or a combination of both of them, where the metal comprises a titanium, and the metal halide is selected from a group consisting of a titanium fluoride, a magnesium fluoride and a strontium fluoride, and where the calcium fluoride crystals comprise a calcium fluoride where a concentration of the calcium fluoride ranges from 98 mol % to 99.9 mol %.
[claim2]
2. A light-emitting element device according to claim 1, wherein said short-wavelength light-emitting element is a blue light-emitting element.
[claim3]
3. A light-emitting element device according to claim 2, wherein a fluorescent substance is applied to said window board formed of calcium fluoride crystals, and blue light is converted to another visible light.
[claim4]
4. A light-emitting element device according to claim 3, wherein a protective film for preventing reflection and moisture absorption is provided on the front surface and/or back surface of said window board.
[claim5]
5. A light-emitting element device according to claim 2, wherein a protective film for preventing reflection and moisture absorption is provided on the front surface and/or back surface of said window board.
[claim6]
6. A light-emitting element device according to claim 1, wherein one or several kinds among lanthanum based metals of lanthanum, europium, erbium, neodymium, cerium, gadolinium and samarium are added to said calcium fluoride crystals.
[claim7]
7. A light-emitting element device according to claim 6, wherein a protective film for preventing reflection and moisture absorption is provided on the front surface and/or back surface of said window board.
[claim8]
8. A light-emitting element device according to claim 1, wherein yttrium is added to said calcium fluoride crystals.
[claim9]
9. A light-emitting element device according to claim 8, wherein a protective film for preventing reflection and moisture absorption is provided on the front surface and/or back surface of said window board.
[claim10]
10. A light-emitting element device according to claim 1, wherein a protective film for preventing reflection and moisture absorption is provided on the front surface and/or back surface of said window board.
[claim11]
11. A light-emitting element device according to claim 10, wherein said protective film is of SiO2 or TiO2.
[claim12]
12. A light-receiving element device comprising a short-wavelength light-receiving element arranged in a container which has a window formed of calcium fluoride crystals, wherein said calcium fluoride crystals comprise either a metal or a metal halide, or a combination of both of them,
where the metal is made of a titanium, the metal halide is selected from a group consisting of a titanium fluoride, a magnesium fluoride and a strontium fluoride; and
where the calcium fluoride crystals are made of a calcium fluoride and a concentration of the calcium fluoride ranges from 98 mol % to 99.9 mol %.
[claim13]
13. A light-receiving element device according to claim 12, wherein a protective film for preventing reflection and moisture absorption is provided on the front surface and/or back surface of said window board.
[claim14]
14. A light-receiving element device according to claim 13, wherein said protective film is of SiO2 or TiO2.
[claim15]
15. An optical device comprising a short-wavelength light-emitting element and a light-receiving element which are provided in a container having a window with a window board formed of calcium fluoride crystals, wherein said calcium fluoride crystals further comprise either a metal or a metal halide, or both of them; and
where the metal is made of a titanium, the metal halide is selected from a group consisting of a titanium fluoride, a magnesium fluoride and a strontium fluoride and the calcium fluoride crystals are made of a calcium fluoride, where a concentration of the calcium fluoride ranges from 98 mol % to 99.9 mol %.
[claim16]
16. An optical device according to claim 15, wherein a protective film for preventing reflection and moisture absorption is provided on the front surface and/or back surface of said window board.
[claim17]
17. An optical device according to claim 16, wherein said protective film is of SiO2 or TiO2.
[claim18]
18. Fluoride crystals containing either metal or metal halide, or both of them, wherein said metal is made of titanium, said metal halide is made of one or more kinds selected among titanium fluoride, magnesium fluoride and strontium fluoride, and said fluoride crystals are made of calcium fluoride; and
where the concentration of the calcium fluoride ranges from 98 mol % to 99.9 mol %.
  • 発明者/出願人(英語)
  • TERASHIMA KAZUTAKA
  • NISHIMURA SUZUKA
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • 313/512
  • 257/98
  • 257/100
  • 313/503
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