Abstract: A gas discharge lamp for dielectrically impeded discharges, which gas discharge lamp is provided with a discharge vessel filled with a gas filling, which discharge vessel comprises at least a wall of a dielectric material and at least a wall having a surface which is at least partly transparent to visible radiation and coated with a phosphor layer, which phosphor layer comprises a phosphor preparation of a phosphor powder and a coating, which coating comprises a compound selected from the group formed by the fluorides and orthophosphates of the elements magnesium, calcium, barium, aluminum, scandium, yttrium and lanthanum, and provided with an electrode structure for a dielectrically impeded discharge, and with means for igniting and maintaining the dielectrically impeded discharge.

Abstract: A plasma display with a carrier plate, a transparent front plate, a ribbed structure which subdivides the space between the carrier plate and the front plate into plasma cells, which cells are filled with a gas, with one or several electrode arrays for generating corona discharges in the plasma cells, and with a phosphor layer which comprises a phosphor chosen from the group of doped europium(II)-activated barium-magnesium aluminates with the general formula

Abstract: A gas discharge lamp fitted with a gas discharge vessel filled with a gas filling is suitable for a gas discharge which emits VUV radiation, with a luminophore coating containing a down conversion luminophore and with means for igniting and maintaining a gas discharge in which the down conversion luminophore has in a host lattice a pair of activators of the a first lanthanoid ion and a second lanthanoid ion and a sensitizer selected from the group of the copper (I) ion, silver (I) ion, gold (I) ion, zinc (II) ion, gallium (III) ion, indium (III) ion, thallium (III) ion, germanium (IV) ion, tin (IV) ion and lead (IV) ion, is environmentally friendly and has a high lamp efficiency &eegr;lamp.

Abstract: The invention describes a light-emitting device (1) which comprises a light-emitting diode and a phosphor layer. To prolong the useful life of the light-emitting device (1), a phosphor (4) in the phosphor layer (2) has a water-resistant coating. FIG.

Abstract: In an UV-reflecting layer for discharge lamps, the layer comprises at least 0.1% by weight of Al2O3 and at least 0.1% by weight of a material having a higher refractive index than Al2O3, so that as large a proportion of UV light as possible can be reflected and as large a portion of visible light as possible can be emitted by the lamp.

Abstract: A low-pressure mercury vapor discharge lamp comprises a discharge vessel (10) having a tubular portion (11). The discharge vessel (10) encloses a discharge space (13) provided with a filling of mercury and a rare gas in a gastight manner. The tubular portion (13) of the discharge vessel (10) is provided with a metal oxide layer (15) and a luminescent layer (17) on a surface (14) facing the discharge space (13). The discharge lamp comprises means for maintaining an electric discharge in the discharge vessel (20b). The discharge lamp is characterized in that the luminescent layer (17) comprises an alkali metal oxide. This alkali metal oxide is preferably sodium oxide and/or potassium oxide, and the concentration of the alkali metal oxide is 0.002≦Na2O≦0.1% by weight and/or 0.002≦K2O ≦0.1% by weight. The tubular portion (11) of the discharge vessel (10) preferably has a further metal oxide layer which acts as an alkali metal-repellent layer.

Abstract: A gas discharge lamp for dielectrically impeded discharges, which gas discharge lamp is provided with a discharge vessel filled with a gas filling, which discharge vessel comprises at least a wall of a dielectric material and at least a wall having a surface which is at least partly transparent to visible radiation and coated with a phosphor layer, which phosphor layer comprises a phosphor preparation of a phosphor powder and a coating, which coating comprises a compound selected from the group formed by the fluorides and orthophosphates of the elements magnesium, calcium, barium, aluminum, scandium, yttrium and lanthanum, and provided with an electrode structure for a dielectrically impeded discharge, and with means for igniting and maintaining the dielectrically impeded discharge.

Abstract: A low-pressure mercury discharge lamp comprising an inner bulb, which forms a gas discharge vessel and the wall of which is made of a material which is transparent to electromagnetic radiation and is coated with a phosphor, and comprising an outer bulb surrounding the inner bulb, the wall of which contains an UV-A phosphor, and comprising means for generating and maintaining a low-pressure mercury gas discharge.