Abstract
In order to improve the luminance and efficiency of PDP, luminance degradation of blueemitting phosphor BaMgAl_<10>O_17:Eu caused by panel making process was investigated with samples prepared by different processes. The least changed sample maintained 83% luminance after the process. Excitation spectra indicate that the degree of the degradation at 147nm excitation was different from that at 254nm. Chemical analyses indicated that the degradation was caused by the change of surface divalent Eu activator to trivalent. Carbon contamination, which was expected to be a cause of the degradation, was not observed on any samples.
