Title:
WAVELENGTH CONVERSION MEMBER AND LIGHT EMITTING DEVICE
Document Type and Number:
Japanese Patent JP2022158107
Kind Code:
A
Abstract:
To provide a wavelength conversion member with which it is possible to efficiently excite a phosphor when ultraviolet light is used as excitation light, and suppress the degradation of peripheral members and the effect on human body due to the leakage of the ultraviolet light.SOLUTION: Provided is a wavelength conversion member 1 for converting the wavelength of excitation light emitted from a light source 7, comprising: a first layer 2 composed of a first glass matrix 4 and phosphor particles 5 dispersed in the first glass matrix 4; and a second layer 3 provided on the first layer 2 and composed of a second glass matrix 6. The first layer 2 is provided on the light source 7 side, and a difference |TA-TB| between a transmittance TA of the first glass matrix 4 and a transmittance TB of the second glass matrix 6 at an excitation wavelength is larger than a difference |LA-LB| between a transmittance LA of the first glass matrix 4 and a transmittance LB of the second glass matrix 6 at a fluorescent wavelength and TA>TB is satisfied.SELECTED DRAWING: Figure 1
Inventors:
UEDA NAOKI
Application Number:
JP2021062789A
Publication Date:
October 17, 2022
Filing Date:
April 01, 2021
Export Citation:
Assignee:
NIPPON ELECTRIC GLASS CO
International Classes:
G02B5/20
Attorney, Agent or Firm:
Patent Attorney Osaka Front Patent Office
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