Patent ID: 7929200

Claim:
A device for modifying a wavelength range of a spectrum of light incident on said device, such that light emitted from said device has a modified wavelength range in comparison to said incident light, said device comprising: a medium that provides photon energy up-conversion including at least two components and a matrix in which said at least two components are distributed, wherein a first component absorbs light at a first wavelength region w≦λ 1 ≦x, said first component functions as a sensitizer in said medium, and a second component emits light at a second wavelength region y≦λ 2 ≦z, said second component functions as an emissive component in said medium, λ 2 ≦λ 1 , upon absorption of light by said first component at said first wavelength region λ 1 , said emissive component emits light at said second wavelength region λ 2 , said first component and said second component are organic compounds, and said first component and said second component are distributed in said matrix which is a solid, a gel or a fluid with viscosity equal or higher than 0.59×10 −3 Pa·s.