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AssigneePhilips Lighting Holding B.V.
InventorsCornelia Titia Staats, Gerardus Arnoldus Rita Van Dijk, Rene Theodorus Wegh, Willibrordus Hubertus Martinus Maria Van De Spijker, Martinus Petrus Joseph Peeters
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The invention relates to a luminescent converter (10, 12) for a phosphor-enhanced light source (100, 102, 104). The luminescent converter comprises a first luminescent material (20) configured for absorbing at least a part of excitation light (hv0) emitted by a light emitter (40, 42) of the phosphor-enhanced light source, and for converting at least a part of the absorbed excitation light into first emission light (hv1) comprising a longer wavelength compared to the excitation light. The luminescent converter further comprising a second luminescent material (30) comprising organic luminescent material (30) and configured for absorbing at least a part of the first emission light emitted by the first luminescent material, and for converting at least a part of the absorbed first emission light into second emission light (hv2) having a longer wavelength compared to the first emission light. An effect of the luminescent converter according to the invention is that the two-step light conversion according to the invention generates a relatively small Stokes shift of the light emitted by the organic luminescent material. The inventors have found that by reducing the Stokes shift of the organic luminescent material, the width of the spectrum of the second emission light is limited to reduce an infrared part in the emission spectrum. As such, the efficiency is improved.
A luminescent converter for a phosphor-enhanced light source, the luminescent converter comprising:
A luminescent converter for a phosphor-enhanced light source, the luminescent converter comprising:
A luminescent converter for a phosphor-enhanced light source, the luminescent converter comprising a first luminescent material configured for absorbing at least a part of excitation light emitted by a light emitter of the phosphor-enhanced light source, and for converting at least a part of the absorbed excitation light into first emission light comprising a longer wavelength compared to the excitation light, and a second luminescent material comprising organic luminescent material that is configured for absorbing at least a part of the first emission light emitted by the first luminescent material, and for converting at least a part of the absorbed first emission light into second emission light having a longer wavelength compared to the first emission light, wherein the wavelength difference between the first emission light and the second emission light is less than 100 nanometers, wherein the second emission light is red light.
Dependencies are inferred from the claim text.