An orange-red phosphor under near-UV excitation for white light emitting diodes

A series of orange-red emitting phosphor compositions Sr1.9-xBaxEu0.05Li0.05MoO6 (x = 0 - 1.9) have been synthesized and characterized by powder X-ray diffraction (XRD) and photoluminescence. XRD results reveal a phase transition from orthorhombic to pseudocubic structure for x >= 0.2. All the compositions show broad charge-transfer band absorption in the near-ultraviolet (UV) region. Orange - red emission is observed for compositions with lower x values (x <= 0.6), whereas orange emission is observed for compositions with higher x values. Select compositions in this system of compounds could find potential applications as orange red phosphors for white light generation using near-UV/blue GaN-based light emitting diodes. (c) 2006 The Electrochemical Society.