Title:
WAVELENGTH CONVERSION ELEMENT, AND LIGHT-EMITTING DEVICE USING SAME
Document Type and Number:
WIPO Patent Application WO/2023/249069
Kind Code:
A1
Abstract:
A wavelength conversion element of the present invention comprises: a first reflective layer; a second reflective layer; and a phosphor layer located between these reflective layers. The first reflective layer reflects light in a first wavelength region. The second reflective layer reflects light in a second wavelength region that overlaps at least a portion of the first wavelength region. The phosphor layer has an excitation wavelength dependence on light-emission wavelength and converts projected excitation light into light having a longer wavelength than the excitation light. / The first reflective layer and the second reflective layer resonate, therebetween, light of a wavelength in a region of overlap between the first wavelength region and the second wavelength region, the light being of the light obtained by wavelength-converting the excitation light by the phosphor layer. The resonated light is converted by the phosphor layer into light of a wavelength longer than the longest wavelength in the second wavelength region. At the second reflective layer, of the light obtained by the excitation light being wavelength-converted by the phosphor layer, light of a wavelength outside the second wavelength region and light of a wavelength longer than the longest wavelength in the second wavelength region and obtained by the resonated light being wavelength-converted by the phosphor layer are each transmitted by, and exit from, the second reflective layer.
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Inventors:
NAGAO TADAAKI (JP)
BARMAN KUMAR BARUN (JP)
HERNANDEZ PINILLA DAVID (JP)
BARMAN KUMAR BARUN (JP)
HERNANDEZ PINILLA DAVID (JP)
Application Number:
PCT/JP2023/023052
Publication Date:
December 28, 2023
Filing Date:
June 22, 2023
Export Citation:
Assignee:
NAT INST MATERIALS SCIENCE (JP)
International Classes:
G02B5/20; B82Y20/00; C09K11/00; C09K11/02; C09K11/06; C09K11/65; H01L33/50
Domestic Patent References:
| WO2018163955A1 | 2018-09-13 |
Foreign References:
| US20080128728A1 | 2008-06-05 | |||
| JP2015511775A | 2015-04-20 |
Attorney, Agent or Firm:
AIDA Satoru et al. (JP)
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