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Device for modifying the wavelength range of a spectrum of light

  • US 20090290211A1
  • Filed: 12/04/2008
  • Published: 11/26/2009
  • Est. Priority Date: 12/04/2007
  • Status: Active Grant
First Claim
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1. A device for modifying, e.g. narrowing the wavelength range of a spectrum of light incident on said device, such that light emitted from said device has a modified, e.g. more narrow wavelength range in comparison to said incident light, said device comprisinga medium for photon energy up-conversion comprising at least two components and a matrix in which said at least two components are distributed, wherein a first component is capable of absorbing light at a first wavelength region w≦

  • λ

    1≦

    x, which first component acts as a sensitizer in said medium, and wherein a second component is capable of emitting light at a second wavelength region y≦

    λ

    2≦

    z, which second component acts as an emissive component in said medium, wherein λ

    2≦

    λ

    1, and wherein, 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, and wherein said first component and said second component are organic compounds, wherein said first component and said second component are distributed in said matrix which matrix is a solid, a gel or a fluid with viscosity equal or higher than 0.59×

    10−

    3 Pa·

    s, wherein said medium optionally comprises further pairs of sensitizer and emissive components, as defined above, but having different absorption and, optionally, emission wavelength regions,said device optionally further comprising a light transparent container for containing said medium, or optionally comprising a light transparent substrate for carrying said medium.

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