Preparation And Luminescence Properties Of Two Kinds Of Oxide-Based Phosphors For Field Emission Displays

Field emission displays(FEDs) with high brightness, high color reducibility, uniform color, fast response speed, low power consumption, high resolution, thin panel thickness is considered as one of the most promising candidates for next generation of FPDs. However, the current researches about the FED luminescent materials also have some problems. First of all, the most mature commercial green phosphor for FEDs is still the ZnO: Zn, it has excellent luminescence brightness and degradation property, however it has poor color purity. Thus it is crucial important to find novel green phosphors with high color purity for FEDs. The second problem is that as the FEDs have its own properties, they are often used as the background light source. The mixed tricolor phosphors offer the white light source, however, the color of the light usually not stable for the different degradation properties among these phosphors. Thus it is important to research a single substrate phosphor which emissions white light. In this paper, aiming at the several problems in the studying of FEDs luminescent materials, we study two kinds of oxide-based phosphors for FEDs systematically through designing the materials, exploring the synthetic methods, characterizing the cathodoluminescence properties and testing degradation properties. The main content shows below:The first part:Mn2+-doped Na2MgGeO4 luminescent materials were synthesized by the solid-state reaction method. Under UV radiation(297nm) and low-voltage electron-beam excitation,,the Mn2+-doped phosphor shows a strong green emission corresponding to the 4T1(4G)â†'6A1(6S) transition of Mn2+ ions. The possible interaction mechanism and thermal quenching properties were investigated under UV radiation(297nm). The CL spectra as a function of accelerating voltage and probe current were also measured. Under continuous low-voltage electron-beam excication, the luminescent materials exhibits excellent degradation property and good color stability.The second part: Aiming at the hot spots of the research about luminescent materials for FEDs——Full color display and Background white light display. Through adjusting the temperature and adding flux, La2Zr2O7:Eu3+,Tb3+,Dy3+ were synthesized by the solid-state reaction method. The cathodoluminescence properties show that: Eu3+-doped La2Zr2O7 shows reddish-orange light, and the quenching concentration was 6%. By adjusting the doping concentration of Tb3+, the luminescent materials show tunable luminescence from blue to green.The third part:Tb3+,Eu3+ co-doped La2Zr2O7 and Dy3+-doped La2Zr2O7 luminescent materials were synthesized. We have gained white emission from a signle host. By adjusting the doping concentration of Dy3+, the luminescent materials show tunable luminescence from bule to yellow. In the degradation properties test, the co-doped one have a better performance.