Patent ID: 11946606
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC F  H  G | IPC F

Claim 0:
1. A wavelength conversion member that emits fluorescent light when illuminated with excitation light, the wavelength conversion member comprising:
a first phosphor layer disposed on an incidence side of the wavelength conversion member, the first phosphor layer including a light receiving surface where the excitation light enters, the first phosphor layer containing a plurality of first phosphor particles and a first matrix; and
a second phosphor layer disposed on a surface of the first phosphor layer opposite to the light receiving surface, the second phosphor layer containing a plurality of second phosphor particles and a second matrix, wherein
the plurality of first phosphor particles is embedded in the first matrix having a refractive index different from a refractive index of the first phosphor particles, or the plurality of second phosphor particles is embedded in the second matrix having a refractive index different from a refractive index of the second phosphor particles,
the first phosphor particles each include an activation component,
the second phosphor particles each include an activation component same as or different from the activation component included in each of the first phosphor particles, and
a concentration of the activation components in the first phosphor particles in the first phosphor layer is lower than a concentration of the activation components in the second phosphor particles in the second phosphor layer.