Intense red phosphor for white LEDs based on blue GaN LEDs

A series of novel red-emitting phosphors AgLa0.95Eu0.05(WO4)(2-x)(MoO4)(x) [x = 0-2] have been synthesized and their luminescence properties investigated. All Eu3+ activated compositions show red emission on excitation either in the charge-transfer band or Eu3+ levels. All compositions show remarkably intense red emission with excitation at 465 nm. The photoluminescence studies on AgLa1-yEuy(WO4)(2) and AgLa1- yEuy(MoO4)(2) (y = 0.1-1 in steps of 0.1) show that the emission intensity is maximum for compositions with y = 0.4 and 0.3, respectively, and a decrease in emission intensity is observed for compositions with higher y values. Select compositions in this system of compounds could find potential application as red phosphors for white-light generation using blue GaN-basedlight-emittingdiodes (LEDs). (c) 2006 The Electrochemical Society.