An Orange-Red Phosphor under Near-UV Excitation for White Light Emitting Diodes

A series of orange–red emitting phosphor compositions 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 . All the compositions show broad charge-transfer band absorption in the near-ultraviolet (UV) region. Orange–red emission is observed for compositions with lower values , whereas orange emission is observed for compositions with higher values. Select compositions in this system of compounds could find potential applications as orange–red phosphors for white light generation using near-UV/blue -based light emitting diodes.