Novel red phosphors for solid-state lighting: the system NaM(WO4)2−x(MoO4)x:Eu3+ (MGd, Y, Bi)

• DOI: 10.1016/j.cplett.2003.12.130
• Publication Date: 2004-02-19T05:07:13Z
• Authors: S Neeraj; N Kijima; A.K Cheetham
• Keywords: Tungstate; Europium

Abstract Solid solutions of tungstate and molybdate scheelites of formula NaLn(WO 4 ) 2 − x (MoO 4 ) x and NaY 1 − y Bi y (WO 4 ) 2 (Ln = Y, Gd) doped with Eu 3+ ion have been synthesized by solid-state reactions. Red luminescence is obtained in these samples on excitation either in the charge-transfer band or Eu 3+ levels. In particular, intense red emission is obtained by exciting at ∼394 nm using the sharp 7 F 0 → 5 L 6 line of Eu 3+ . These materials could find applications as red phosphors for white lighting devices utilizing GaN-based excitation in the near UV.