Patent DE-102005061854-A1 (DE)
Title: Single-panel safety glass element useful as a facade component of a building, comprises a persistently luminescent, afterglow element on the basis of persistently luminescent inorganic luminophores
Inventor: CESNIK GERHARD
IPC: E04B2/88
Filed: 2005-12-23
Abstract: The single-panel safety glass element (1) useful as a facade component of a building (3), comprises a persistently luminescent, afterglow element on the basis of persistently luminescent inorganic luminophores. The glass element is coated on the surface pointing away from a viewer (4) with the afterglow element made of persistently luminescent pigments. The persistently fluorescent and inorganic fine pigments are incorporated in a largely transparent matrix and are excited by means of sunlight or artificial light. A colored emission is produced for more than 10 hours after termination of the exciting radiation. The single-panel safety glass element (1) useful as a facade component of a building (3), comprises a persistently luminescent, afterglow element on the basis of persistently luminescent inorganic luminophores. The glass element is coated on the surface pointing away from a viewer (4) with the afterglow element made of persistently luminescent pigments. The persistently fluorescent and inorganic fine pigments are incorporated in a largely transparent matrix and are excited by means of sunlight or artificial light. A colored emission is produced for more than 10 hours after termination of the exciting radiation in such a manner that the emission is perceived by the human eye that is adapted to darkness in dark or dim environment. The afterglow element spans across a part of the visual surface of the glass element and is in the form of a graphic design (5). The glass element is designed in such a manner that the visual appearance is similar to window elements (2) of the building. The matrix of the afterglow element is composed of inorganic glass frits and a two-component transparent coating composition. The persistently luminescent pigment is an aluminate that is doped with a rare earth element, and/or a silicate, and the like, or a zinc sulfide afterglow luminophore or mixtures of several persistently luminescent pigments of different excitation and decay rates and different colors of emission are used. The afterglow element is graphically applied directly to the rear side of the glass using screen printing or transfer printing process and is designed in such a manner that several layers are superimposed and/or placed side-by-side and glazing, translucent and/or color-converting and/or color-giving and/or reflective and/or luminescent and/or absorbing elements, and/or elements with persistently luminescent pigments with different persistent luminescence and persistent luminescence colors are used. The persistently luminescent pigment is excited by a radiation of wavelength of 200-450 nm, and has persistent luminescence duration of greater than 20 hours up to a luminance of 0.3 mcd/m2> and an emission in the wavelength range of visible light. The persistently luminescent pigment is formed from nanoscale inorganic pigments or agglomerates or aggregates in the sub-micrometer range up to a few micrometers of the pigment dimensions or crystalline pigments of 5-30 microns. An independent claim is included for a procedure for the production of a glass element.