Peer+ B.v.

Casper Laurens Van Oosten

Michael George Debije

Shufen Tsoi

Cornelis Wilhelmus Maria Bastiaansen

Albertus Petrus Hendrikus Johannes Schenning

A guest-host liquid crystal dye mixture comprising a calamatic, thermotropic liquid crystal as host and a dichroic fluorescent dye as guest, characterized in that the dichroic fluorescent dye is a multichromophoric dye containing at least a group with the general formula Ry-X&#x2014;C, wherein Ry is a chromophore from the rylene family, Cis a second chromophore and Xis a spacer that interrupts the conjugation between Ry and C, the spacer Xis selected such that it introduces rigidity against bending or folding over an axis perpendicular to the length of the molecule.

Liquid crystal dye mixture

A controllable glazing, containing at least a first and a second reflective polarizer and a liquid-crystal-dye layer. The liquid-crystal-dye-layer is arranged between the first and the second reflective polarizer. The alignment of the dichroic dye and the alignment of the liquid crystal of the liquid-crystal-dye-layer are changeable. The first and the second reflective polarizer are denoted for electromagnetic radiation in the wavelength range of &#x3bb;1 to &#x3bb;2 and the liquid-crystal-dye-layer is selected such that the electromagnetic radiation transmission through the controllable glazing is controlled in the wavelength range of &#x3bb;3 to &#x3bb;4 by dye-absorbance and in the wavelength range &#x3bb;1 to &#x3bb;2 by alignment of the liquid crystal and the dye in the liquid-crystal-dye layer. The wavelength range of &#x3bb;1 to &#x3bb;2 is within the wavelength range of 750 nm to 2000 nm and the wavelength range of &#x3bb;3 to &#x3bb;4 is within the wavelength range of 380 nm to 750 nm.

Electro-optical controllable glazing

The invention provides a luminescent optical device () having an optical waveguide (). The luminescent optical device () further has a photo-luminescent structure () on or inside the optical waveguide (). The photo-luminescent structure () comprises a plurality of photo-luminescent domains () containing photo-luminescent material (). The photo-luminescent material () is capable of emitting emission light upon excitation by excitation light. The photo-luminescent domains () are arranged to emit, upon excitation by excitation light, at least part of the emission light into the optical waveguide layer (). The luminescent optical device () further may comprise a lens structure () on the optical waveguide (). The lens structure () comprises a plurality of lenses (), arranged to capture incident light provided from an external light source, in particular the sun, and to concentrate the incident light onto the plurality of photo-luminescent domains () as excitation light for excitation of the photo-luminescent material ().

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Utrecht, Netherlands

Casper Laurens Van Oosten