Preparation And Luminescent Properties Of Eu ^{3 +} Doped Borate Phosphors For White LED

White light-emitting diode（W-LED） is widespread concern because of advantages such as improving efficiency, energy saving and environmental protection. To attain high color rendering white LED, the red-emitting phosphors are required. Based on the excellent luminescent properties of borate phosphors, the activation of Eu³⁺ to the Sr₃RE₂（BO₃）₄（RE=Y,Gd,La） phosphors were synthesized by high temperature solid-state reaction in this study.1. A series of Sr₃RE₂（BO₃）₄:Eu³⁺（RE=Y,Gd,La） phosphors were sintered through high temperature solid-state reaction. The optimum conditions is 1000℃ for 5h, the Sr3Y2（BO₃）₄, Sr3Gd2（BO₃）₄, Sr3La2（BO₃）₄ optimal doping content of Eu³⁺ are7.5%（mol） 、10%（mol） and 7.5%（mol）. It exhidbit red light peaking at 618 nm under394nm UV light excitation which assigning to 5D0→2F2 transitions of Eu³⁺ respectively.2. A battery of Sr₃Y_2-y My（BO₃）₄:Eu³⁺（M=Gd,La） phosphors were sintered through high temperature solid-state reaction. The luminescence can be improved after Gd³⁺and La³⁺ co-doped at 618 nm under 394 nm UV light excitation which assigning to 5D0→7F2transitions of Eu³⁺ respectively. Both for the optimal sensitizer doping content of Gd³⁺and La³⁺ are 20%（mol）.The optimal activator doping content of Eu³⁺ is 10%（mol）.It was found that the inclusion of Gd³⁺, La³⁺ in Sr₃Y_2-y My（BO₃）₄:Eu³⁺（M=Gd,La）phosphors dramatically enhanced the fluorescence intensity 50% and 54%, separately.In summary, A series of Sr₃RE₂（BO₃）₄:Eu³⁺（RE=Y, Gd, La） and Sr₃Y_2-y My（BO₃）₄:Eu³⁺（M=Gd, La） phosphors were synthesized, which well be used as a new kind of red emitting phosphor excited by UV LED, with stable property and simple preparation, and bid fair to find application as red emitting phosphor of tri-color phosphor for white LED.