abstract |
A phosphor plate of the invention comprises a plate-shaped composite material including a base material and a phosphor dispersed in the base material, wherein when the absorption spectrum is measured for light having a wavelength of 300 nm to 700 nm, if the absorption at 455 nm is deemed A455(%), the absorption at 700 nm is deemed A700(%), and the thickness of the phosphor plate is deemed T (mm), then (A700/A455)/T is at least 0.01 but not more than 1.00. |