Title:
LIGHT WAVELENGTH CONVERSION MEMBER AND LIGHT EMITTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/154869
Kind Code:
A1
Abstract:
The present invention provides: a light wavelength conversion member which is capable of enhancing the luminous intensity by enhancing the light extraction efficiency, while being able to suppress color unevenness; and a light emitting device. A light wavelength conversion member 9 according to the present invention is provided with a ceramic plate 11 which is configured from a polycrystalline body that is mainly composed of Al2O3 and a component represented by A3B5O12:Ce; and each of A and B in A3B5O12 represents at least one element selected from the element groups described below. In addition, a dielectric multilayer film 13 which transmits a specific wavelength and reflects another specific wavelength is formed on a light incident surface 11a of the ceramic plate 11. The ceramic plate 11 has a porosity of 2% by volume or less, while having an average surface roughness (an arithmetic mean roughness Sa) of 0.5 μm or less.
A: Sc, Y and lanthanoids (excluding Ce)
B: Al and Ga
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Inventors:
ITO TSUNEYUKI (JP)
KATSU YUSUKE (JP)
TAKAKU SHOHEI (JP)
KATSU YUSUKE (JP)
TAKAKU SHOHEI (JP)
Application Number:
PCT/JP2017/040613
Publication Date:
August 30, 2018
Filing Date:
November 10, 2017
Export Citation:
Assignee:
NGK SPARK PLUG CO (JP)
International Classes:
G02B5/20; C09K11/08; C09K11/80; G02B5/28; H01L33/50; H01S5/02
Foreign References:
| JP2016021582A | 2016-02-04 | |||
| JP2016138034A | 2016-08-04 | |||
| JP2016060859A | 2016-04-25 | |||
| JPH06302302A | 1994-10-28 | |||
| JP2009540069A | 2009-11-19 | |||
| JPS5740017B2 | 1982-08-25 | |||
| JP2016060859A | 2016-04-25 |
Other References:
See also references of EP 3588151A4
Attorney, Agent or Firm:
NAKAJIMA Hiroki et al. (JP)
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