OPTICAL MATERIAL AND USE THEREOF

摘要

An optical material of the present invention includes: a phosphor which has an excitation wavelength in a range from 220 nm to 500 nm, a fluorescence wavelength in a range from 380 nm to 650 nm, a maximum excitation wavelength in a range from 350 nm to 400 nm, and a maximum fluorescence wavelength in a range from 400 nm to 500 nm; and an ultraviolet light absorber, and the light transmittance thereof measured at a thickness of 2 mm satisfies the following features (1) to (3) :
(1) The light transmittance at a wavelength of 440 nm is 80% or higher.
(2) The light transmittance at a wavelength of 420 nm is 70% or lower.
(3) The light transmittance at a wavelength of 410 nm is 5% or lower.