SrCaO Protective Layer for High-Efficiency PDPs

The sustain pulse voltage of the panel for 66-kPa Ne + Xe (5%-30%) is 20%-40% lower with a Sr
_0.62
Ca
_0.38
O protective layer than with a MgO protective layer. At a normal sustain voltage of 160-200 V, the luminous efficiency of the panel with the Sr
_0.62
Ca
_0.38
O protective layer for Xe (30%) is about twice as high as with the MgO protective layer for Xe (10%). The luminances of these panels are almost the same. This high efficiency at normal sustain pulse voltage and normal luminance is obtained through the combined use of the Sr
_0.62
Ca
_0.38
O protective layer and high Xe content. With regard to ion bombardment, the Sr
_0.62
Ca
_0.38
O film has a 4.5 times longer life than SrO film and nearly 80% of the life of MgO film. We also calculated the values of theoretical secondary electron emission yield gamma
_imin
of MgO, SrO, and CaO without energy bands in the band gap for rare gas ions and found that [ gamma
_imin
of MgO] les [gamma
_imin
of CaO] < [gamma
_imin
of SrO] except for the one case with He. The breakdown voltage decreases with higher gamma
_imin
values. As expected, the discharge voltage of the panel is much lower with the SrO protective layer than with the MgO protective layer. The discharge voltages of the panels with Sr
_0.62
Ca
_0.38
O and SrO protective layers are almost the same. These findings show that the life of the SrO protective layer can be made 4.5 times longer without any increase in the discharge voltage by adding CaO (40 at.%)