| abstract |
Provided is a phosphor capable of obtaining a phosphor layer having high emission luminance even after the irradiation time of an excitation source has elapsed. A first fluorescent substance containing an activator (activator 1) based on a compound represented by the following formula (1) and a compound represented by the following formula (2) And a second fluorescent material containing an activator (activator 2) as a base. mM 11 O · nM 21 O · 2M 31 O 2 (1) pM 12 O · qM 22 O · 2M 32 O 2 (2) (The above M 11 and M 12 are selected from Ca, Sr and Ba, M 21 and M 22 represent Mg and / or Zn, M 31 and M 32 represent Si and / or Ge, and m represents 2.5 to 3.5, n is 0.5 to 1.5, p is 0.5 to 1.5, and q is 0.5 to 1.5.) [Selection figure] None |