| abstract |
This specification discloses a method of enhancing the stability and performance of Eu 2+ doped narrow band red emitting phosphors. The resulting phosphor compositions are characterized by crystallizing in ordered structure variants of the UCr 4 C 4 crystal structure type and having a composition of AE 1−x Li 3−2y Al 1+2y−z Si z O 4−4y−z N 4y+z :EU x (AE=Ca, Sr, Ba; 0<x<0.04, 0≤y<1, 0<z<0.05, y+z≤1). It is believed that the formal substitution (Al,O) + by (Si,N) + reduces the concentration of unwanted Eu 3+ and thus enhances properties of the phosphor such as stability and conversion efficiency. |