Koninklijke Philips Corporation N.v.

Philips Lighting Holding B.v.

Koninklijke Philips Electronics N.v.

Cornelia Titia Staats

Theodoor Cornelis Treurniet

Johannes Petrus Maria Ansems

Vincent Stefan David Gielen

Martinus Petrus Joseph Peeters

Adrianus Sempel

Rene Theodorus Wegh

Berend Jan Willem Ter Weeme

Theodorus Gerardus Marinus Maria Kappen

Ingrid Jozef Maria Snijkers-Hendrickx

Johannes P M Ansems

Leonie Maria Geerdinck

Vincent S D Gielen

Engelbertus Cornelius Petrus Maria Vossen

Gerardus Arnoldus Rita Van Dijk

Berend J W Ter Weeme

Esther De Beer

Willibrordus Hubertus Martinus Maria Van De Spijker

Joseph F R Eijsermans

Theodorus G M M Kappen

Piet Antonis

Onno Van Tertholen

Martinus P J Peeters

Gerardus A R Van Dijk

Willibrordus H M M Van De Spijker

Lars R C Waumans

Gerrit J T Huijgen

The invention relates to a luminescent converter () for a phosphor-enhanced light source (). The luminescent converter comprises a first luminescent material () configured for absorbing at least a part of excitation light (hv) 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 (hv) comprising a longer wavelength compared to the excitation light. The luminescent converter further comprising a second luminescent material () comprising organic luminescent material () 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 (hv) 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.

Luminescent converter for a phosphor-enhanced light source

The invention provides an illumination device comprising an envelope enclosing a light source, preferably a LED, and a luminescent material. The envelope comprises a transmissive part, and a reflective part, wherein the reflective part comprises a reflective ceramic material. The ceramic material can be used for heat dissipation.

Illumination device with an envelope enclosing a light source

A low-pressure mercury vapor discharge lamp () has a discharge vessel () enclosing, in a gastight manner, a discharge space provided with a filling of mercury and a rare gas. The discharge vessel () comprises means for maintaining an electric discharge in the discharge space. A portion of the surface () of the discharge vessel () facing the discharge space is provided with a protective layer () comprising yttrium oxide or aluminum oxide and further comprises a borate and/or a phosphate of an alkaline earth metal and/or of scandium, yttrium, or a further rare earth metal. Preferably, the alkaline earth metal is calcium, strontium, and/or barium. Preferably, the further rare earth metal is lanthanum, cerium, and/or gadolinium. The lamp according to the invention has a comparatively low mercury consumption.

Low-pressure mercury vapor discharge lamp

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Eindhoven, Netherlands

Cornelia Titia Staats