Intense Red Phosphor for White LEDs Based on Blue GaN LEDs

A series of novel red-emitting phosphors Ag La 0.95 Eu 0.05 ( W O 4 ) 2 − x ( Mo O 4 ) x [ x = 0 – 2 ] have been synthesized and their luminescence properties investigated. All Eu 3 + activated compositions show red emission on excitation either in the charge-transfer band or Eu 3 + levels. All compositions show remarkably intense red emission with excitation at 465 nm . The photoluminescence studies on Ag La 1 − y Eu y ( W O 4 ) 2 and Ag La 1 − y Eu y ( Mo O 4 ) 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-based light-emitting diodes (LEDs).