cathodoluminescence


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Related to cathodoluminescence: Photoluminescence, electroluminescence

Cathodoluminescence

A luminescence resulting from the bombardment of a substance with an electron (cathode-ray) beam. The principal applications of cathodoluminescence are in television, computer, radar, and oscilloscope displays. In these a thin layer of luminescent powder (phosphor) is evenly deposited on the transparent glass faceplate of a cathode-ray tube. After undergoing acceleration, focusing, and deflection by various electrodes in the tube, the electron beam originating in the cathode impinges on the phosphor. The resulting emission of light is observed through the glass faceplate, that is, from the unbombarded side of the phosphor coating.

The luminescence of most phosphors comes from a few sites (activator centers) occupied by selected chemical impurities which have been incorporated into the matrix or host solid. Because of the complex mode of interaction of cathode rays with phosphors, the energy efficiency of light production by cathodoluminescence is lower than the best efficiencies obtainable with photoluminescence. Conversion efficiencies of currently used display phosphors are between 2 and 23%. See Luminescence

cathodoluminescence

[¦kath·ə‚dō‚lüm·ə′nes·əns]
(electronics)
Luminescence produced when high-velocity electrons bombard a metal in vacuum, thus vaporizing small amounts of the metal in an excited state, which amounts emit radiation characteristic of the metal. Also known as electronoluminescence.
References in periodicals archive ?
Cathodoluminescence images of recrystallized carbonates commonly are 'blotchy'.
Prior to analysis the grains were photographed using both SEM cathodoluminescence and light microscopy.
Schieber's team examined micrometer-scale quartz grains using scanning cathodoluminescence, a type of electron microscopy good for detecting textural differences.
Cathodoluminescence uses a stream of electrons that are shot at the refractory buildup surface at a specific angle.
The scanning electron microscope must be able to detect energy-dispersive secondary electrons, backscattered electrons, cathodoluminescence in 3 discrete wavelength regions (RGB) as well as X-ray radiation in the high vacuum and variable pressure range.
c and d) cathodoluminescence images of small anhedral apatite (yellow) enclosed in, or along grain boundaries of, plagioclase.
Conventional petrography analyses were performed on 20 thin sections stained with alizarin red to differentiate calcite from other carbonate minerals, and they were as well observed under fluorescence and cathodoluminescence.
Cathodoluminescence and diagenetic alteration of marine carbonate minerals (in Chinese with English abstract).
Cathodoluminescence of defects in diamond films and particles grown by hot-filament chemical-vapor deposition.
Among the topics are conventional and advanced electron transmission microscopy, observing chemical reactions using transmission electron microscopy, in-situ transmission electron microscopy studies of oxidation, current-induced transport: electromigration, and cathodoluminescence in scanning and transmission electron microscopies.