BaAl_(12)O_(19):Mn~(2+)和YPO_4:Tb~(3+)共混对等离子绿色发光体发光性能的改善

等离子体平板显示用绿色发光粉主要有硅酸盐(Zn2S iO4∶Mn2+)、铝酸盐(BaA l12O19∶Mn2+)、磷酸盐(YPO4∶Tb3+)和硼酸盐(YBO3∶Tb3+)4种体系。前两者具有量子效率高、色纯度好等优点,然而抗真空紫外辐照能力差,发光衰减时间长;Tb3+激活的磷酸盐和硼酸盐体系具有适宜的发光寿命,抗真空紫外辐射能力强,然而Tb3+的发射光是黄绿色,色纯度不够好,且发光亮度相对较弱。按一定的混合比率使BaA l12O19∶Mn2+和YPO4∶Tb3+均匀混合,组合这两种体系绿色发光粉各自的优点,优化了等离子体平板显示用绿色发光粉的整体性能。

Improvement of Luminescence Performance on Green-emitting PDP Phosphor by Blending BaAl12O19: Mn2+ and YPO4: Tb2+

The research on Plasma display panel (PDP) phosphors has gained much attention. The green PDP phosphor is an important component due to its highest brightness in three-color-based phosphors. Existing and developing green-emitting phosphors include Mn-activated silicates and aluminates, and Tb-activated phosphates and borates systems. Mn-activated silicates and aluminates have high quantum efficiency and excellent color coordinate, but low stability to vacuum ultraviolet (VUV) radiation and long decay time. Tb-activated phosphates and borates have suitable decay time and high stability to VUV radiation, but low brightness and color purity. This work investigates the luminescent performance of single BaAl12O19:Mn2+, YPO4:Tb3+, and especially their blends. The result indicates that the blends of BaAl12O19:Mn2+ and YPO4:Tb3+ can effectively combine their respective advantages to improve the overall luminescent performance of green-emitting phosphors for PDP application.