Title:
PHOSPHOR ELEMENT, METHOD FOR PRODUCING SAME, AND LIGHTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/065927
Kind Code:
A1
Abstract:
[Problem] To increase the fluorescence intensity of emitted light and minimize color irregularity in emitted white light when excitation light is made to enter a reflective phosphor element and fluorescence is generated. [Solution] A phosphor element 1 is provided with: a phosphor section 2 that is provided with an entry surface 2a for excitation light, a facing surface 2b facing the entry surface, and a side surface 2c, that converts at least some excitation light entering the entry surface into fluorescence, and that causes the fluorescence to be emitted from the entry surface; a single low refractive index layer 3 that is present on the side surface 2c and the facing surface 2b of the phosphor section 2, and that has a lower refractive index than the refractive index of the phosphor section 2; and a single reflective film 4 that covers the surface of the low refractive index layer 3. The area AI of the entry surface 2a of the phosphor section 2 is larger than the area AR of the facing surface 2b.
Inventors:
KONDO JUNGO (JP)
OKADA NAOTAKE (JP)
IWATA YUICHI (JP)
ASAI KEIICHIRO (JP)
OKADA NAOTAKE (JP)
IWATA YUICHI (JP)
ASAI KEIICHIRO (JP)
Application Number:
PCT/JP2018/036331
Publication Date:
April 02, 2020
Filing Date:
September 28, 2018
Export Citation:
Assignee:
NGK INSULATORS LTD (JP)
International Classes:
H01S5/022; F21V7/26; G02B5/20; H01L33/50; F21Y115/30
Domestic Patent References:
| WO2015163109A1 | 2015-10-29 | |||
| WO2014119783A1 | 2014-08-07 |
Foreign References:
| JP2015050124A | 2015-03-16 | |||
| JP2016058624A | 2016-04-21 | |||
| JP2013187043A | 2013-09-19 | |||
| US20170219171A1 | 2017-08-03 | |||
| JP2014186916A | 2014-10-02 | |||
| JP2017028251A | 2017-02-02 |
Attorney, Agent or Firm:
HOSODA Masutoshi et al. (JP)
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