Ba^(2+)对YVO_4∶Dy^(3+)荧光粉发光性能的影响

Effect of Ba^(2+) on the Luminescence Properties of YVO_4∶Dy^(3+) Phosphor

用化学共沉淀法制备了Y0.99-xBaxVO4∶1%Dy3+荧光粉,研究了Ba2+浓度(0≤x≤0.25)及电荷补偿剂K+对荧光粉发光强度的影响。结果表明:在315 nm紫外光激发下,随Ba2+浓度的增加,Y0.99-xBaxVO4∶1%Dy3+荧光粉发光强度呈现先增加后降低的趋势,在x=0.1处达最大值,与未添加Ba2+的荧光粉相比发光强度提高约50%,但色坐标变化不明显,色温在5200 K左右,为光色柔和的暖白光。电荷补偿剂K+的添加使Y0.99-xBaxVO4∶1%Dy3+荧光粉在Y0.99-xBaxKxVO4∶1%Dy3+荧光粉发光强度的基础上明显提高,色坐标及色温变化不明显。

Y0.99-xBaxVO4∶1% Dy^3＋ phosphor was prepared by chemical co-precipitation method.The influence of Ba^2＋ concentration（0≤x≤0.25） and charge compensation of K^＋ on the luminous intensity were studied.The results showed that Y0.99-xBaxVO4∶1%Dy^3＋（0≤x≤0.25） phosphor under UV excitation（at 315 nm）,as the concentration of Ba^2＋ increasing,phosphors luminous intensity at first increased and then decreased.When Ba^2＋ mole fraction was 0.1,Y0.99-xBaxVO4∶1%Dy^3＋（0≤x≤0.25） phosphor reached the maximum luminous intensity,and compared with the undoped Ba^2＋ of Y0.99-xBaxVO4∶1%Dy^3＋ phosphor,the luminnous intensity increased approximately 50%.But Ba^2＋ concentration in the Y0.99-xBaxVO4∶1% Dy^3＋ phosphor made the CIE coordinates change indistinctly,and not changing light color（warm-white light）.The color temperature of Y0.99-xBaxVO4∶1%Dy^3＋ phosphor was about 5200 K.The emission intensity of Y0.99-xBaxKxVO4∶1%Dy^3＋ phosphor with charge compensation of K^＋ increased obviously based on Y0.99-xBaxVO4∶1%Dy^3＋ phosphors.The addition of K^＋ made little change about the CIE coordinates and the color temperature of Y0.99-xBaxVO4∶1%Dy^3＋ phosphor.