Koninklijke Philips Corporation N.v.

Peer+ B.v.

Shufen Tsoi

Erik Paul Boonekamp

Andreas Aloysius Henricus Duijmelink

Gerardus Wilhelmus Gerbe Van Dreumel

Michael George Debije

Casper Laurens Van Oosten

Cornelis Wilhelmus Maria Bastiaansen

According to an aspect of the present invention, a lighting device () is provided. The lighting device () comprises a wavelength converting layer () having a curved shape and a light source () arranged to emit light towards the wavelength converting layer (). The wavelength converting layer () intersects a plane extending through the light source () and being parallel with the optical axis of the light source (), at a curve given, in a polar coordinate system centered at the light source (), by the equation: R(&#x3c6;)=k&#xb7;I(&#x3c6;)&#xb1;D, wherein k is a constant, 0 is an angle with respect to said optical axis, /(&#x3c6;) is a function defining a luminous intensity profile of the light source and D is a deviation ranging from zero to 20% of the maximum value of said curve, R. The present invention is advantageous in that the lighting device () has a more uniform color distribution of emitted light across the wavelength converting layer () and the risk of color gradients and artifacts is reduced.

Lighting device having a remote wavelength converting layer

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 ().

Luminescent optical device and solar cell system with such luminescent optical device

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Weert, Netherlands

Shufen Tsoi