| abstract |
(57) [Summary] [Objective] An afterglow phosphor having various emission tones other than blue and green is obtained. In particular, an afterglow phosphor having a white emission color tone is obtained. [Structure] In an aluminate phosphor activated by divalent europium, its chemical composition formula is represented by the general formula (Ca 1-pqr , Eu p Nd q Mn r ) O · n (Al. 1-m B m ) 2 O 3 · kP 2 O 6 where 0.0001 ≦ p ≦ 0.5 0.00005 ≦ q ≦ 0.5 0.00005 ≦ r ≦ 0.7 0.0001 ≦ p + q + r ≦ 0.75 0.0001 ≤ m ≤ 0.5 0.5 ≤ n ≤ 3.0 0 ≤ k ≤ 0.2 1 ≤ r / p ≤ 20 and an afterglow phosphor. |