High contrast CRT faceplate

The objective of this program is the development of a high contrast, two color CRT faceplate employing evaporated thin film phosphors and nonreflective backing, utilizing 1710 glass and also sapphire substrates. Twenty-six faceplates were fabricated using 1710 glass and 19 using sapphire as substrate. Sapphire was found to possess several advantages over 1710 glass. The 2000 C plus melting point allows sulfurization treatment of the phosphor film at the optimum 1050 C temperature without faceplate distortion. Adhesion of the film is excellent. Thermal conductivity of sapphire, two orders of magnitude greater than 1710 glass, provides excellent dissipation of heat produced by an electron beam.