abstract |
The present invention of the general formula (I) EA 2 - x Eu x SiO 4 · aM 2 B 4 O relates to a compound of 7 (I), wherein EA is at least two elements selected from Ca, Sr, Zn and Ba , M represents Li, Na or K, a represents a value in the range 0.01 ≦ a ≦ 0.08, and x represents a value in the range 0.01 ≦ x ≦ 0.25. |