US Patent No. 10,422,942


Patent No. 10,422,942
Issue Date September 24, 2019
Title Luminescence Concentrator
Inventorship Martinus Petrus Joseph Peeters, Eindhoven (NL)
Assignee SIGNIFY HOLDING B.V., Eindhoven (NL)

Claim of US Patent No. 10,422,942

1. A lighting device comprising:a luminescent concentrator, the luminescent concentrator comprising a waveguide having a radiation input face, a radiation exit face, and a width (W) being defined by the radiation input face and an opposite face, the waveguide comprising a radiation converter element distributed in the waveguide with a radiation converter concentration, wherein the waveguide comprises a single crystal;
a solid state light source configured to irradiate the radiation input face of the waveguide with solid state light source radiation;
wherein the radiation converter element is configured to absorb at least part of the light source radiation and to convert into radiation converter element radiation, and
wherein a concentration of the radiation converter element within the waveguide is selected to be at least three times of that necessary for the radiation converter element to absorb 98% of the light source radiation over the width (W) of the waveguide.