Device for collecting light and method of manufacturing such device

US4260219A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Waldemar Greubel · Munich, DE
• Ferdinand Quella · Munich, DE

Key dates

• Filing date: Aug 1, 1979
• Grant date: Apr 7, 1981
• Expiry date: Aug 1, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S385/902
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A light-collecting device in the form of, for example, a rectangularly-shaped body having a so-called "fluorescent plate" with at least one light-exit window is comprised of a solid polymerized synthetic carrier material, such as a polyacrylate, a polymethacrylate, polystyrene or copolymer of a methacrylate and a styrene containing fluorescing particles therein which have finite dipole moments with different values in the basic and in the excited state and containing an amphiphilic additive, such as an ionoic or non-ionoic or polymeric soap, with such amphiphilic additive being colloidally dissolved in the synthetic carrier in such a manner that the fluorescing particles are each surrounded by one of the colloid particles and an environment with an orientation polarization is attained whereby the environment can re-orientate so quickly that it achieves its thermodynamic equilibrium substantially completely during the existence of the excited state in the fluorescing particles and tends to suppress the disruptive self-absorption of a light within the fluorescent plate. Such self-absorption originates from a partial overlap of the emission spectrum with the absorption spectrum of the…