36.2: Distinguished Paper: New Polycrystalline MgO for a Thermally Stable and Fast Delay Time in AC PDP

We have extensively studied polycrystalline MgO sources for achieving a thermally stable and fast delay time in AC PDP. The key idea was to improve MgO film properties by doping p-type, equivalent, and n-type elements to the MgO matrix. Their behaviors in a gas discharge were tested. Most of them showed severe discharge jitters. By doping Ca, Al, Si, and a particular n-type element, the discharge instability was greatly reduced, so that the elements were studied in more details. We found that doping of the last element was highly effective in lowering the delay time, improving the thermal stability, and lowering the firing voltage. We proved that the improvement is largely due to the electron emission enhanced by defects in MgO band gap and lattice distortion which is induced by dopants.