Low-voltage cathodeluminescence of europium-activated yttrium orthovanadate

Mark L. F. Phillips

doi:10.1117/12.207522

24 April 1995 Low-voltage cathodeluminescence of europium-activated yttrium orthovanadate

Mark L. F. Phillips

Proceedings Volume 2408, Liquid Crystal Materials, Devices, and Displays; (1995) https://doi.org/10.1117/12.207522
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1995, San Jose, CA, United States

Abstract

Emissive flat panel display systems operating in full color demand higher performance at low voltages (ca. 50 - 1000 V) from cathodoluminescent (CL) phosphors than cathode ray tubes require. Hydrothermal synthesis has been suggested as a route to phosphors with improved efficiencies, lower voltage thresholds, and increased saturation power. This hypothesis was tested in europium-doped yttrium orthovanadate (YVO₄:Eu), an efficient, red emitting CL phosphor. The CL efficiency of YVO₄:Eu crystallized from aqueous solution at 200 degree(s)C is relatively low until it is annealed. The distribution of particle sizes in the low- temperature phosphor is similar to that in material made via a solid-state route, but crystallites remain much smaller (ca. 400 angstrom) until they are annealed. These observations, along with the anomalously strong dependence of CL intensity on europium concentration, support a model in which efficiency principally depends on crystallite size. CL efficiency of both solid state and hydrothermal YVO₄:Eu increases with voltage at constant power. Surface-bound electrons are likely the dominant influence on efficiency at voltages near threshold. Saturation power is independent of synthetic route. It is apparent that the CL properties of hydrothermally synthesized YVO₄:Eu are essentially the same as those of YVO₄:Eu produced via conventional, high-temperature routes.

Citation Download Citation

Mark L. F. Phillips "Low-voltage cathodeluminescence of europium-activated yttrium orthovanadate", Proc. SPIE 2408, Liquid Crystal Materials, Devices, and Displays, (24 April 1995); https://doi.org/10.1117/12.207522

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