Novel technique of phosphor deposition to form Cathode-Ray- Tube screens.

We developed a new phosphor deposition technique for CRT display applications. In this new technique, phosphor powder was treated in H2SO4, deposited on a substrate and heated between 320 and 780C for about 1 to 2h O2. XRD and TGA analyses showed that a sulfate phase was formed by this treatment, and the sulfate phase served as a binder and increased the contact area between adjacent YAG particles and between the YAG layer and the substrate as shown by SEM studies. The flexural strength of the phosphor layer was measured to be about 80 times stronger than phosphor samples prepared by die compaction at 69 MPa. Furthermore, phosphor layers prepared by our novel technique were about 10% higher in cathodoluminescence than those prepared by the conventional settling technique.