Cathodoluminescence Measurement Techniques

A comparison is made of the three modes of cathodoluminescence excitation: continuous, pulsed, and raster. The proper excitation density needed to correctly analyze data obtained in each mode is discussed. The effects of a shrunken raster are investigated, and a new concept, multiexcitation, is presented. It is shown that the lack of correlation between brightness measurements made on small screens in demountable systems and full‐size television picture tubes is due to multiexcitation. Furthermore, multiexcitation tends to linearize sublinear phosphors, such as the sulfides, masking their saturation at high excitation density. It is proposed that, to avoid multiexcitation, phosphor evaluation measurements be made with either pulsed or single line scan rasters.