| 摘要 |
An optical material according to the present invention includes an ultraviolet-ray absorbing agent and a fluorescent substance, the fluorescent substance having an excitation wavelength from 220 nm to 500 nm, a fluorescence wavelength from 380 nm to 650 nm, a maximum excitation wavelength from 350 nm to 400 nm, and a maximum fluorescence wavelength from 400 nm to 500 nm. The measured optical transmittance of the optical material at a thickness of 2 mm satisfies the following properties (1) through (3): (1) optical transmittance of 80% or higher for 440 nm wavelength, (2) optical transmittance of 70% or lower for 420 nm wavelength, (3) optical transmittance of 5% or lower for 410 nm wavelength. |
