Device for collecting light and method of manufacturing such device

US4264124A · kind A · utility

Assignee

• Seimens Aktiengesellschaft · DE

Inventors

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

Key dates

• Filing date: Aug 1, 1979
• Grant date: Apr 28, 1981
• Expiry date: Aug 1, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/52
• 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, a polystyrene or copolymers thereof, containing fluorescing particles therein which have finite dipole moments with different values in the basic and in the excited state and containing a polar organic additive, such as a high-boiling polar solvent, for example, an aliphatic or aromatic alcohol, a nitrile or an ionogenic or non-ionogenic soap, with the fluorescing particles and additive being substantially uniformly distributed throughout such carrier material. The additive creates an environment with an orientating polarization about the fluorescent particles 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 light within the fluorescent plate. Such self-absorption originates from a partial overlap of the emission spectrum …