Highly-efficient cathodoluminescent screens for mid- and high-voltage FED displays

A dissociation approach to precursor calcination and time-limited heat treatment was used for synthesis of the phosphor grains. Average size of the grains was lowered to 3.2-3.5 /spl mu/m. The cathodoluminescent efficiency was measured at 1 and 5 /spl mu/A/cm/sup 2/ in the accelerating voltage range of 1 to 10 kV. Two approaches were developed for phosphor deposition onto the glass substrates in order to fabricate front plates for FED displays. The thickness of the phosphor layers was 2 to 6 /spl mu/m and the size of the front plate was 50 to 125 mm. Less than 0.1% of a low molecular weight binder was used to promote the adhesion of the phosphor grains to the substrate. A three-stage thermal treatment of the screens in a controlled atmosphere with a controlled redox potential resulted in increased adhesion and reduced gas absorption of the phosphor layer.