Lighting device with light source and wavelength converting element
AssigneeKoninklijke Philips N.V.
InventorsJoerg Meyer, Volker Weiler, Peter Josef Schmidt
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Abstract
The invention relates to a lighting (1) device comprising a light source (2) and a wavelength converting element (7), which comprises a phosphor compounded with a polymer. The phosphor contains a metal-ion activator which is excitable via a partially forbidden electronic transition. The phosphor and the polymer being chosen such that the difference in their refractive index is smaller than 0.1. Due to this choice, scattering in the wavelength converting element (7) remains at minimum. Interesting wavelength converting elements (7) are obtained when using phosphors comprising specific Mn(IV)-activated fluoride compounds and specific fluorine-containing polymers.
Claims13
A lighting device comprising:
- a light source arranged to emit light with a primary wavelength, and
- a wavelength converting element arranged to convert at least part of the light with the primary wavelength into light with a secondary wavelength, the element comprising a phosphor with a metal-ion activator which is excitable via a partially forbidden electronic transition, said phosphor being compounded with a polymer, the phosphor and the polymer being chosen such that the difference in their refractive index is smaller than 0.1,
- wherein the phosphor comprises a Mn(IV)-activated fluoride compound,
- wherein the Mn(IV)-activated fluoride compound comprises Na3Li3Al2F12:Mn(IV).
A lighting device comprising:
- a light source arranged to emit light with a primary wavelength, and
- a wavelength converting element arranged to convert at least part of the light with the primary wavelength into light with a secondary wavelength, the element comprising a phosphor with a metal-ion activator which is excitable via a partially forbidden electronic transition, said phosphor being compounded with a polymer, the phosphor and the polymer being chosen such that the difference in their refractive index is smaller than 0.1,
- wherein the phosphor comprises a Mn(IV)-activated fluoride compound,
- wherein the polymer is a fluorine-containing polymer,
- wherein the polymer is a co-polymer comprising at least two of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride.
Dependencies are inferred from the claim text.