TITLE:
Synthesis of a Novel Bluish-Green Emitting Oxynitride Ca3Al8Si4O17N4:Eu2+ Phosphor in a CaAl4-xSixO7-xNx Solid Solution System
AUTHORS:
Jihae Kim, Hideki Kato, Makoto Kobayashi, Yasushi Sato, Masato Kakihana
KEYWORDS:
Oxynitride Phosphor; Eu2+ Activator; Ca3Al8Si4O17N4:Eu2+; Solid Solution
JOURNAL NAME:
Optics and Photonics Journal,
Vol.3 No.6A,
October
25,
2013
ABSTRACT: Synthesis of oxynitride solid solutions CaAl4-xSixO7-xNx:Eu2+ (x = 0 - 4) was
attempted by the solid state reaction (SSR) methods using Si3N4 and AlN as nitrogen sources. The Ca3Al8Si4O17N4 (x = 4/3) sample with the high phase purity was obtained when AlN was
used as a nitrogen source whereas the sample synthesized using Si3N4 as another nitrogen source contained a Ca2Al2SiO7 impurity. Thus, it was revealed that AlN was a preferable nitrogen source for
the synthesis of Ca3Al8Si4O17N4 by the SSR method. The solid solutions around x = 4/3 activated with Eu2+ exhibited bluish-green luminescence with emission maxima at 480 nm by the
excitation at 250 - 450 nm.
Thus, the CaAl4-xSixO7-xNx: Eu2+ solid solutions especially for
Ca3Al8Si4O17N4:Eu2+ (x = 4/3) were developed as novel Eu2+