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Field emission displays (FEDs) are promising technologies for the realization of thin flat panel displays characterized by high contrast, wide viewing angle, and low power consumption. The materials and technology utilized in FEDs resemble those of cathode-ray tubes (CRTs). The basic structure of a FED is two separate plates, one with phosphors and the other with field emitters. Electrons emitted from the emitter tips are attracted through an electric field to the back plate. Many researchers have studied the cathodoluminescence (CL) properties of phosphors for use in low voltage (< 2 kV) Spindt-type FEDs. Carbon nanotubes (CNTs) have been considered prime candidates for use as the field emitters for FEDs due to their high aspect ratios, sharp tips, high chemical stabilities, and high mechanical strengths. Moderate voltages (3-8 kV) are required for operating the CNT-FEDs in order to obtain adequate brightness. At present, however, there is limited information on the CL properties of sulfide phosphors at moderate voltages. In the present study, Y2O2S:Eu, SrGa2S4:Eu, and ZnS:Ag,Al, which are red-, green-, and blue-emitting phosphors respectively, were synthesized by solid-state reaction. The CL properties of the three sulfide phosphors were investigated at applied voltages of 3-8 kV to determine whether they are suitable for use in CNT-FEDs.

Moderate Voltage Cathodoluminescence of Y2O2S:Eu, SrGa2S4:Eu, and ZnS:Ag,Al for CNT-FEDs