Performance of electrophoretic deposited low voltage phosphors for full color field emission display devices

Abstract

Electrophoreticdeposition of low voltage phosphors was successfully carried out on patterned indium–tin–oxide glass in order to develop prototype full color field emission display devices. The optimized suspension consisted of 2–3 μm size color phosphors in isopropyl alcohol, and mixed La(NO3)2 and Al(NO3)2 salts for the best display panel images. The ZnS:Cu, Al, ZnS:Ag, Cl, and Y2O2S:Eu phosphors were used to produce primary green, blue, and red colors, respectively. The compositional and structural analysis of the phosphors was performed and basic deposition parameters, such as deposition time and applied voltages, were systematically investigated in order to obtain the desirable brightness in real panels. A uniform thickness of about 4–9 μm was achieved over a whole 4 in. glass plate, depending on the electrical properties of each phosphor. Finally, the depositedphosphors were extensively characterized by a scanning electron microscopy, three-dimensional surface analysis.