Abstract: The invention relates to a photochemical reactor (12). The invention further relates to a photochemical processing system. The photochemical reactor comprises a vessel (20) comprising the fluid (30), a light source (40) for generating UV-radiation (UV1) and emitting it towards the fluid, and a luminescent material (50) arranged between the light source and the fluid for converting at least part of the UV-radiation emitted by the light source to further UV-radiation (UV2) having an increased wavelength compared to the UV-radiation. The luminescent material is removably connected to the photochemical reactor and is separate from the light source. By having the luminescent material removably connected to the photochemical reactor, separate from the light source, the luminescent material may be exchanged with new luminescent material if the current luminescent material has degraded.

Abstract: The present invention prefers to an optical device with a channel waveguide structure as well as a method of fabrication. A thin waveguide layer (2) of a fluoride glass, in particular a Zirkonium fluoride glass, especially ZBLAN, is applied on a substrate (1) and structured to form waveguide channels (7) by pressing a stamp (3) onto said layer (2). The stamp (3) is designed having cutting edges (4) formed according to desired contours of channels (7) of the waveguide structure and providing free space for displacement of material of the waveguide layer (2). The stamp (3) and/or the waveguide layer (2) are preheated to a temperature allowing the displacement of the material of the waveguide layer (2) by the cutting edges (4). The invention allows a fast and cheep production of a channel waveguide structure.

Abstract: A colored luminaire, in particular a colored signaling light for automobiles, fitted with a lamp and a luminaire cover in which the lamp has a bulb with a coating of a first layer comprising a pigment, which pigment is chosen from the group of perylene pigments, perinone pigments, isoindoline pigments, and thioindigo pigments, is remarkable for a long useful life. It is not attacked by UV radiation, moisture, and spraying salt and is resistant to temperatures of between 250 and 350° C. Colored luminaires with bulb coatings comprising these pigments alone or in combination with further pigments for color correction comply with the color standards for automobile luminaires.

Abstract: A display screen, in particular a flat display screen, having a glass face plate with a transparent electrode layer of a metal oxide, for example indium-doped tin oxide (ITO), a phosphor layer and an adhesive intermediate layer of an alkali silicate between the electrode layer and the phosphor layer.

Abstract: The luminescent phosphor degradation in a cathode ray display tube, caused by aging, is decreased. This decrease is achieved by introducing before and/or during evacuation a hydrolyzable gas into the tube's inner space for a limited time interval, using a partial pressure which is essentially larger than the eventual final vacuum pressure of the cathode ray tube, and then allowing the final vacuum pressure to be achieved without any further supply of gas. Thereafter, the cathode ray tube is sealed in a gastight manner.