is a material which is capable of emitting light. It is used in fluorescent lamps, monitors etc. The duration of the emission depends on the type of phosphor.
a substance exhibiting the property of phosphorescence
Material which coats the back side of a CRT screen.
A luminescent substance that emits light when excited by radiation and is used as an alloy for the making of bronze.
A coating that emits light when excited by energy. The screen on night vision equipment is green phosphor.
The chemical substance on the inside face of a computer screen that illuminates when electrically charged. The colour accuracy and luminance values of phosphors change over time, necessitating regular monitor calibration if consistent colour is required.
An inorganic chemical compound processed into a powder and deposited on the inner glass surface of fluorescent tubes and some mercury and metal halide lamp bulbs. Phosphors are designed to absorb short wavelength ultraviolet radiation and to transform and emit it as visible light.
Stamps are overprinted, inked or impregnated with phosphorescent or ‘fluorescent' substances for use in electronic letter-facing and postmarking machines.
The chemical coating on the inside of the CRT screen that emits light (monochrome or color) when struck by an electron beam. Each dot on the screen is actually a phosphor that glows for a period of time. See " Persistence."
A substance that can produce red, green, or blue light when excited by an energy source, such as the electron beam in a CRT. Phosphors are arranged as either dots or stripes on the inside face of a CRT screen.
a chemical substance that emits visible light when it's excited by UV energy
a chemical that glows when exposed to electrical energy
a material that absorbs one
a material which absorbs one type of light and radiates another
a molecule that absorbs radiation and uses that energy to emit visible light at a specific wavelength (color)
a substance that can accept energy in one form (for example, energy from a high-speed electron as in a TV tube -- see How Television Works ) and emit the energy in the form of visible light
a substance that emits light when subjected to radiation
a substance that radiates visible light after being energized
a type of chemical that glows when hit by an electron
is the chemical coating on the inside of a CRT tube that emits light (fluoresces) when struck by electrons.
Phosphorescent substance of red, green and blue that emit light when activated by electrons.
A chemical substance used in the production of selected stamps to activate machines that automatically cancel mail. The machines react to the phosphor under ultraviolet light. In 1959, Great Britain began to print phosphor lines on some of its stamps. See also Tagging.
A chemical compound that emits visible light when struck by energetic electrons, which is the usual arrangement within a cathode-ray tube, or CRT. Cathode rays are, in fact, electrons accelerated via high-voltage plates to an energy capable of exciting the three phosphor types at the front of a monitor.
Chemical compound that emits light while being excited by electrons.
A chemical substance that exhibits fluorescence when excited by ultraviolet radiation, x-rays or an electron beam. The amount of visible light is proportional to the amount of excitation energy. If the fluorescence decays slowly after the exciting source is removed, the substance is said to be phosphorescent.
Phosphor: The chemical on a CRT screen which holds the light generated by the red, green and blue electron guns. Each dot on the screen is actually a phosphor which glows for a given length of time.
Material that glows within a CRT when struck by the electron beam Phosphor composition determines the maximum range of colors that can be displayed on a screen.
An electrofluorescent material used to coat the inside of the screen in a cathode ray tube and which glows when struck by electrons. A typical CRT uses separate phosphor materials, one each for the three primary colors (red, blue and green).
Chemical compund that emits light when excited by electrons.
Light-emitting material such as that on the inner surface of a CRT screen, that creates an image when selectively stimulated.
For a short period (1962-67) the Post Office issued commemorative stamps in two formats: with phosphor bands (phos) and without phosphor bands (non-phos). These phosphor bands are visable to the naked eye when held at an angle to the light. They were introduced as an aid to electronic franking of mail. From the Paintings issue of 1967 all stamps were issued with phosphor bands until this was replaced in 1979 with an all over phosphor coating.
The phosphorescent coating on the interior of the front surface of a cathode ray tube (CRT) that emits light of one of the three additive primary colors (red, green, or blue) when a carefully controlled beam of electrons strikes the material. Depending on the type of color tube, the pattern of the phosphors can be dot, brick-like, or stripe.
The coating on the inside of CRTs. Phosphor glows when struck with electrons. Images appear on a CRT by controlled scanning of an electron beam.
Element that emits light (red, green and blue light as used in video displays) when it is bombarded by or excited by electrons.
A material which when excited with ultra-violet light emits a bright light.
Substance that is capable of luminescence.
The phosphorescent coating that appears inside a fluorescent tube to, with UV, create light.
Chemical compound that emits light when excited by electrons.
A material that emits light when struck by electrons. Phosphor decay time for emitting light varies depending on the material. A fast decaying phosphor has a larger grain structure which means the resolution capability of the phosphor is reduced.
Luminescent material applied to the inner face of a cathode ray tube that when bombarded with electrons will emit light of various colors.
A luminescent substance, used to coat the inside of the Cathode-Ray Tube display, (used inside most computer monitors) that is illuminated by the electron gun in the pattern of graphical images as the display is scanned.
A chemical substance that fluoresces when excited by x-rays, an electron beam, or ultraviolet radiation. Phosphors are composed of rare earth oxides or halides (e.g., gadolinium, lanthanum, yttrium) and usually emit green light with decay times ranging from hundreds of nanoseconds to a few milliseconds.
Substance which glows when struck by electrons. The back of a cathode ray tube face is coated with phosphor.
A phosphor is a substance that exhibits the phenomenon of phosphorescence (sustained glowing after exposure to light or energised particles such as electrons).