PHOSPHOR SCREENS FOR IMAGE PROJECTION

In this work we describe a methodology to obtain phosphor screens used in various applications to produce images or patterns such as detectors and microscopes. The main advantages of these screens are the particle free and self-heating properties that allows it to be used in controlled environments minimizing the adsorbed gases in the surface of the screen. A polyvinyl alcohol deposited on top of the phosphor layer acts as an adhesive layer preventing the removal of phosphor particles from the screen surface that could result in measurement environment contamination. The tin oxide layer has a high melting point enabling the self-heating. These characteristics on screens are important for ultra-high vacuum environment and to study carbon nanotube emission patterns through field emission microscopy (FEM).