Title:
WHITE LIGHT SOURCE
Document Type and Number:
WIPO Patent Application WO/2017/200097
Kind Code:
A1
Abstract:
The present invention provides an illuminating light source capable of providing white light which is gentle on the human body and does not contain excessive blue light components, the brightness of the light not decreasing even when lit continuously for a long period of time, and at the same time having high-level color rendering characteristics. According to an embodiment, this white LED includes at least three types of members based on an ultraviolet to violet light emitting LED, a blue phosphor that converts the primary light emitted by the LED to blue light, and a YAG-based phosphor that absorbs some of the secondary light emitted by the blue phosphor and converts the absorbed secondary light to green to yellow light. White light resulting from the mixing of green to yellow light, etc., with blue light is radiated from the white LED. The white light has high-level color rendering characteristics and a high luminous flux maintenance factor, and enables exhibiting of excellent characteristics with countermeasures implemented for problems such as blue-light hazards.
Inventors:
ITOGA TATSUNORI (JP)
TSUDA RYOJI (JP)
MATSUDA NAOTOSHI (JP)
FUNAYAMA YOSHITAKA (JP)
TSUDA RYOJI (JP)
MATSUDA NAOTOSHI (JP)
FUNAYAMA YOSHITAKA (JP)
Application Number:
PCT/JP2017/018892
Publication Date:
November 23, 2017
Filing Date:
May 19, 2017
Export Citation:
Assignee:
TOSHIBA KK (JP)
TOSHIBA MATERIALS CO LTD (JP)
TOSHIBA MATERIALS CO LTD (JP)
International Classes:
H01L33/50; C09K11/64; C09K11/66; C09K11/73; C09K11/80
Domestic Patent References:
| WO2006077740A1 | 2006-07-27 | |||
| WO2006064930A1 | 2006-06-22 |
Foreign References:
| JP2013175548A | 2013-09-05 | |||
| JP2013521617A | 2013-06-10 | |||
| US20050224828A1 | 2005-10-13 | |||
| JP3700502B2 | 2005-09-28 | |||
| JPS503139B1 | 1975-01-31 | |||
| JP4989936B2 | 2012-08-01 | |||
| JPS5330263B2 | 1978-08-25 | |||
| JP5390390B2 | 2014-01-15 |
Other References:
JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN, vol. 94, no. 4, April 2010 (2010-04-01)
See also references of EP 3460860A4
See also references of EP 3460860A4
Attorney, Agent or Firm:
KURATA, Masatoshi et al. (JP)
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