| 摘要 |
An optical glass contains a substance A generating light of a wavelength »2 when irradiated with light of a wavelength »1 and a substance B generating light of a wavelength »3 when irradiated with light of the wavelength »1 when a relation between the wavelength »1 and the wavelength »2 and the wavelength »3 is assumed to be »1 < »2 < »3 with respect to 100% of basic glass composition containing 2-10% of SiO 2 , 5-45% of B 2 O 3 , and 30-60% of La 2 O 3 or further containing 0-15% of RO(R=Zn, Sr, Ba), 0-40% of Ln 2 O 3 (Ln=Y, Gd), and 0-30% of ZrO 2 +Nb 2 O 5 +Ta 2 O 5 , and the substance B generates fluorescent light with the wavelength »3 of 650 nm or more when excited at the wavelength »1 of 550 nm or less. |
