摘要:
A low-pressure gas discharge lamp comprising a gas discharge vessel with a gas filling containing mercury, and comprising electrodes, means for igniting and maintaining a gas discharge, and a phosphor coating containing at least one phosphor layer and a UV-C phosphor and a phosphor that can be excited by UV-C radiation.
摘要:
The invention relates to a method of coating luminescent powders with a coating which comprises silicon dioxide, which method is characterized in that in a first step luminescent particles are dispersed in a solution containing one or more metallo-organic compounds of silicon and, optionally, metallo-organic compounds of further elements in a hydrous solvent mixture having a pH-value of 1
摘要:
The invention relates to a display screen comprising a phosphor composition of a sulphide and/or selenide-containing phosphor which is provided with a coating which comprises one or more catena-polyphosphates of one or more alkaline earth metals, zinc, cadmium and/or manganese. In such a display screen, in particular a low-energy cathode ray display screen, the advantages of the efficient sulphide or selenide-containing phosphors can be used and said display screen remains bright and rich in contrast for a long period of time because the coating acts as a stabilizing protective coating which limits the corrosion processes in sulphide and/or selenide-containing phosphors induced by low-energy radiation.
摘要:
A method describing the manufacture and use of aqueous suspensions comprising fine-powdered ceramic solid particles, dispersing agents and, if necessary, binders, in which method the manufacture of the suspensions includes the following process steps which are carried out separately or in combination:washing the solid particles in water before preparing the suspension;adding anionic compounds, in the form of sulphates, carbonates, iodates, chromates, oxalates, citrates and/or tartrates;manufacturing the suspensions and/or storing the finished suspensions in a CO.sub.2 -free gaseous atmosphere;manufacturing the suspensions and storing the finished suspensions at a temperature below 20.degree. C., preferably below 15.degree. C.;adding additional dispersing agents to the suspension at a time when reagglomeration of the solid particles in the suspension has not yet started or just started.
摘要:
A nozzle of a dyestuff applicator has a cylindrical valve housing formed with an orifice obstructable by the tip of an electromagnetically displaceable needle which controls the outflow of dyestuff from a chamber in that housing. The chamber is sealed by a rubber diaphragm which is penetrated by the needle whose shaft is engaged by a pair of parallel membranes of spring steel peripherally clamped in an extension of the housing. Each membrane comprises a narrow outer ring with an inwardly projecting tongue split into two diverging branches which are interconnected at their free ends, near the diametrically opposite side of the outer ring, by a re-entrant web extending radially between these branches and terminating in an inner, needle-supporting ring concentric with the outer ring.
摘要:
The invention relates to a light emitting device, especially a LED comprising a green emitting material of the composition Sr5−y−z−aMySi23−xAl3+xOx+2aN37−x−2a:Euz:Cez1. This material has been found to have a narrow emission in the green wavelight range together with a good producibility and stability.
摘要:
The invention relates to an improved red light emitting material of the formula M1−yA1+xSi4−xN7−x−2yOx+2y:RE whereby M is selected out of the group comprising Ba, Sr, Ca, Mg or mixtures thereof, A is selected out of the group comprising Al, Ga, B or mixtures thereof, RE is selected out of the group comprising rare earth metals, Y, La, Sc or mixtures thereof and x is ≧0 and ≦1 and y is ≧0 and ≦0.2. This material is believed to crystallize in a novel structure type that comprises two individual lattice sites for rare earth metal incorporation, which leads to an improved lighting behaviour.
摘要:
The invention relates to a luminescent material comprising a luminescent particle (20) for generating light (4), wherein the luminescent particle (20) has a structured particle surface for effectively outcoupling the light (4) generated within the luminescent particle (20). Furthermore, the invention relates to a light source comprising a luminescent material according to the invention and a device for exciting the luminescent material.
摘要:
An ultraviolet reflecting layer and a fluorescent lamp is described, comprising an envelope having an inner surface, means within the lamp envelope for generating ultraviolet radiation, a light emitting layer of a luminescent material for generating visible light when impinged by ultraviolet radiation, and said ultraviolet reflecting layer, located between the light emitting layer and the inner surface of the lamp envelope, wherein the ultraviolet reflecting layer comprises a metal phosphate and/or a metal borate, with the metal being selected from Sc, Y, La, Gd, Lu and Al, or combinations thereof. The phosphates or borates used in the ultraviolet reflecting layer may optionally be doped by a Tb3+ and/or Dy3+ activator, to further improve the quantum yield of the conversion of UV radiation into visible light.
摘要:
A system includes a radiation source capable of emitting first light and a fluorescent material capable of absorbing the first light and emitting second light having a different wavelength than the first light. The fluorescent material is a phosphor having the formula (Lu1-x-y-a-bYxGdy)3(Al1-zGaz)5O12:CeaPrb wherein 0