Photoluminescence properties of Sr₃Y₂(BO₃)₄: Eu³⁺ phosphor codoped with Gd³⁺ and La³⁺ under ultraviolet excitation

Sr 3 Y 2 (BO 3 ) 4 : Eu 3+ phosphor codoped with Gd 3+ and La 3+ was generated using the solid state method, and XRD and fluorescence spectrum researched the structure and luminescence properties. The strongest excitation peak of Sr 3 Y 2 (BO 3 ) 4 :Eu 3+ is in the near ultraviolet region of 394 nm, which comes from the 7 F 0 → 5 L 6 transition of Eu 3+ . With the stimulation of 394 nm ultraviolet-light, the strongest emission of Sr 3 Y 2 (BO 3 ) 4 :Eu 3+ phosphor is a red light with a wavelength of 618 nm. It is produced by the transition of 5 D 0 → 7 F 2 of Eu 3+ . The optimum preparation temperature is 1000°C, and the doping amount of Eu 3+ is 5% (mol). The doping of Gd 3+ and La 3+ greatly enhanced the luminescent intensity of Sr 3 Y 2 (BO 3 ) 4 :Eu 3+ phosphor, and the doping of 20% (mol) was suitable.