PDP用荧光粉的真空紫外辐照特性

Radiant Properties of PDP Phosphor by Vacuum Ultraviolet

利用“等离子体显示用荧光粉光学测试系统”中147nm真空紫外光,对实用的（Y,Gd）BO_3:Eu红粉,Zn_2SiO_4:Mn和（Ba,Sr,Mg）O·nAl_2O_3:Mn绿粉以及（Ba,Mg）O·nAl_2O_3:Eu^(2+)蓝粉进行较长时间的辐照,以观察荧光粉的衰减特性,发现红粉衰减最小,蓝粉初始衰减较快,而绿粉亮度存在一个先升后降的现象。

The PDP would be the most promising that panel displays for high definition television (HDTV), wall-hanging TV, because the size can be increased relatively easily and it also offers fast response, a wide viewing angle and other advantages. In PDPs, three primary color phosphors are excited by more energetic vacuum ultraviolet (VUV) radiation of wavelengths of 130, 147 and 172nm from inert gas plasma. PDP phosphors are exposed to the VUV of high energy and high intensity. Thus the radiation stability of phosphors should be considered seriously. The color center and surface defects of phosphor caused by the radiation will decrease luminescence efficiency. In the paper, the radiation properties of PDP phosphors were studied by 147nm excitation. These PDP phosphors are (Y, Gd) BO3:Eu (red), Zn2SiO4:Mn (green), (Ba, Sr) O·nAl2O3:Mn (green) and (Ba,Mg)O·nAl2O3:Eu2+(blue). We have observed the decay of (Y, Gd)BO3: Eu is the smallest amount the four phosphors; the decay of (Ba, Mg)O·nAl2O: Eu2+ is the fastest at the beginning, then the decay speed change slower. It may be the Eu2+ in (Ba, Mg) O·nAl2O3:Eu2+ is unstable, because it could be oxidized to Eu3+ under the VUV radiation. We have found that the brightness of Zn2SiO4:Mn(green) and (Ba, Sr)O·nAl2O3:Mn rise at first, then decay down; the decay of Zn2SiO4:Mn is slower than that of (Ba, Sr)O·nAlO3: Mn, but the brightness of (Ba, Sr)O· nAl2O3:Mn is higher than Zn2SiO4:Mn. The performance of the commercial PDP phosphors is still not good enough for practical application. For the wide spread acceptance of the PDP, new phosphors should be developed in the near future.