Enhanced orange-red emission by using Mo codoped in Ba2CaWO6: Eu3+, Li+ phosphor under near UV excitation

The orange-red emitting phosphors Ba2Ca0.9MoxW1−xO6:Eu3+0.05, Li+0.05 (x=0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.5, 0.75, and 1.0) and Ba2Ca1−2yMo0.2W0.8O6:Eu3+y, Li+y (y=0.03, 0.05, 0.07, 0.1, and 0.15) were synthesized. The crystalline structure and photoluminescence properties of these phosphors were described. The strong orange-red emission of Eu3+ (5D0—7F1 transition) at around 593 nm was observed. Addition of Mo strongly enhances the charge transfer band absorption in the near ultraviolet region that corresponds to near ultraviolet white light emitting diode. The dependence of photoluminescence intensities on Eu3+ concentrations with optimal Mo concentration under 400 nm excitation was studied. The phosphor is considered to be a promising orange-red emitting phosphor for near ultraviolet GaN-based white light emitting diode.