Development of a Luminescence Workstation

9626371麦克特里克用于显示应用的高亮度、热稳定的荧光粉材料的开发已成为诸如彩色等离子体和场发射显示器等新型平板显示器开发的限制步骤。荧光粉是由电子束或光子等能源激发时的发光材料，由含有少量掺杂剂(激活剂)的惰性主体晶格组成。大多数商业上可用的发光显示荧光粉都是为工作在10-30keV的高压阴极射线管应用而开发的。在开发用于低电压(100-10,000 eV)或等离子体显示器(147 nm处的紫外线发射)的新组合物方面所做的工作非常少。这些新的应用对荧光粉的需求不是现有组合物优化或满足的。该项目旨在建立一个多用途的工作站，用于评估阴极发光和光致发光材料在CRT屏幕、场发射设备和等离子显示器中的应用。该工作站将由真空泵、真空室、质谱仪和光谱辐射计以及相关电子设备组成，用于评估低电压和中压阴极发光荧光粉。紫外线评估将由商业上可获得的发光分光光度计进行。我们的研究主要集中在新型荧光粉组合物的合成、粉末的沉积以形成高粘附性、致密的屏幕以及这些屏幕的发光性能的表征。我们将注意力集中在了解、建模和预测发光行为上，以最终提高高压荧光屏的亮度、效率和减少发射衰减时间。然而，表面的作用(点缺陷和线缺陷、吸附物种、形态、晶界等)在根本层面上没有被理解。比较单晶、粉末屏和薄膜荧光粉的发光行为将提供关于表面如何影响光电子发射的基本信息，这反过来将有助于优化荧光屏的显示应用。***

9626371 McKittrick The development of high brightness, thermally stable, phosphor materials for display applications has become the limiting step in the development of new flat panel displays such as color plasma and field emission displays. Phosphors are luminescent materials when excited by an energy source such as an electron beam or photons and are composed of an inert host lattice with a small amount of dopant (activator). Most of the commercially available emissive display phosphors have been developed for high voltage, cathode ray tube applications which operate at 10-30 keV. There has been very little work done on developing new compositions for low voltage (100-10,000 eV) or plasma displays (UV emission at 147 nm). These new applications have demands on phosphors that are not optimized or met by the existing compositions. This project is to build a multipurpose workstation for the evaluation of cathodoluminescent and photoluminescent materials for applications in CRT screens, field emission devices and plasma displays. The workstation will consist of vacuum pumps, a vacuum chamber, a mass spectrometer, and a spectroradiometer with associated electronics for the evaluation of low and medium voltage cathodoluminescent phosphors. The UV evaluation will be performed by a commercially available luminescence spectrophotometer. %%% Our research has focused on the synthesis of novel phosphor powder compositions, the deposition of the powders to form highly adherent, dense screens and the characterization of the luminescent properties of these screens. We have concentrated our attention on understanding, modeling and predicting the luminescent behavior to ultimately improve the brightness, efficiency, and to decrease the emission decay time of high voltage phosphor screens. However, the role of surfaces (point and line defects, absorbed species, morphology, grain boundaries, etc.) is not understood on a fundamental level. Comparing the luminescent behavior of single crystals, powder screen and thin film phosphors will yield basic information on the how photoemission is affected by surfaces which in turn will aid in optimizing phosphor screens for display applications. ***