Phosphor selection constraints in application of gated field-emission microcathodes to flat panel displays

Abstract

The major issues and tradeoffs surrounding phosphor selection for field-emission flat panel displays are identified. The two main classes of commercially available phosphors applicable to flat panel displays are contrasted, and the major physical, electrical, chemical and optical factors effecting phosphor selection are discussed. The implications of screen layering designs and cathode materials are described as they relate to phosphor characteristics. Resolution requirements for displays severely limits the maximum anode voltage, which in turn forces specific phosphor choices. Possible solutions to these limitations are explored.

Spectrum designation and effect of Al substitution on the luminescence of Cr3+ doped ZnGa2O4 nano-sized phosphors

“…Since the application and development of carbon nanotube as cathode emitter [2], phosphors with high efficiency and chemical stability became the next research focus [3]. The stability of oxide phosphors in vacuum and the absence of corrosive atmosphere under electron bombardment exhibit great advantage in comparison with traditional sulfide-based phosphors [4][5][6]. Besides, the resolution of images is related closely to the particle size of phosphors [7], while conventional phosphors are mostly obtained by solid state reaction which results in micrometer-sized (4-8 mm) particles.…”

Fabrication and properties of nanocomposite ITO layer containing terbium doped yttrium aluminum garnet nanocrystallites

“…However, one of the problem in a field emission displays is a decreasing of the cathodoluminescence efficiency by negative loading of the grain surface in the phosphor layer. That is why the electrical conductivity of the light emitting layer should be high enough to avoid the charge accumulation [5][6][7]. The very important is also the high efficiency and other features of phosphors.…”

Phosphor challenge for field-emission flat-panel displays

“…In fact, the architecture of the FED is such that commercial CRT phosphors are not optimum, and consequently there are challenges to overcome in using RGB triplets in this new display configuration. 3 Specifically, ͑a͒ CRT phosphors are operated at very high acceleration voltages, typically 13-30 kV, and such high voltages require significant anode-cathode spacing ͑e.g., Ͼ1 cm͒ to prevent vacuum breakdown, arcing and associated destructive consequences such as field ionization of the surfaces. ͑b͒ Operation of FEDs with closer anode-cathode spacing, such as 1 mm, can be achieved at lower voltages, such as 2-4 kV; however, this spacing is still problematic.…”