Koninklijke Philips Corporation N.v.

Jorg Meyer

Peter Josef Schmidt

Walter Mayr

Thomas Justel

Hans-Helmut Bechtel

Bernd Ackermann

Helmut Bechtel

An illumination system, comprising a radiation source and a luminescent material comprising at least one phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of wavelength different from that of the absorbed light; wherein said at least one phosphor is a yellow red-emitting cerium(III)-activated alkaline earth oxonitridoaluminosilicate of general formula Ca1&#x2212;x&#x2212;yAxAl1+a&#x2212;bBbSi1&#x2212;aN3&#x2212;aOa:Cey, wherein A selected from the group comprising beryllium, magnesium, strontium, barium, zinc, manganese, lithium, sodium, potassium, rubidium, praseodymium, samarium, europium, and B selected from the group comprising boron, gallium, scandium and wherein 0&#x3c;x&#x2266;1; 0&#x3c;y&#x3c;0.2; 0.001&#x3c;a&#x3c;1 and 0.001&#x3c;b&#x3c;1 can provide light sources having high luminosity and color-rendering index, especially in conjunction with a light emitting diode as a radiation source. The red to yellow-emitting cerium(III)-activated alkaline earth oxonitridoaluminosilicate of general formula Ca1&#x2212;x&#x2212;yAxAl1+a&#x2212;bBbSi1&#x2212;aN3&#x2212;aOa:Cey, wherein A selected from the group comprising beryllium, magnesium, strontium, barium, zinc, manganese, lithium, sodium, potassium, rubidium, praseodymium, samarium, europium, and B selected from the group comprising boron, gallium, scandium and wherein 0&#x3c;x&#x2266;1; 0&#x3c;y&#x3c;0.2; 0.001&#x3c;a&#x3c;1 and 0.001&#x3c;b&#x3c;1 is efficiently excitable by primary radiation in the near UV-to-blue range of the electromagnetic spectrum.

Illumination system comprising a radiation source and a luminescent material

A lighting device for generating colored and white light. According to the invention the lighting device comprises at least one light source () emitting blue or ultraviolet light and a color conversion unit () for converting said blue or ultraviolet light into visible light comprising at least two sections (), at least one section () of which being a transparent or translucent color converting section, said color conversion unit () being arranged for alternately illuminating said at least two sections () with said blue or ultraviolet light, said at least one color converting section containing luminescent material, wherein said luminescent material is a luminescent organic dye in a polymer matrix or a crystalline inorganic luminescent material.

Colored and white light generating lighting device

A light emitting device includes a substrate layer and a light conversion layer located on said substrate layer. The light conversion layer is a polycrystalline ceramic layer, and is positioned on the substrate layer by sintering.

Light emitting device with improved conversion layer

A device for generating ultraviolet radiation by an excimer discharge includes at least partly UV-transparent discharge vessel whose discharge space is filled with a gas filling. The device further includes electrodes for triggering and maintaining an excimer discharge in the discharge space, and a luminescent material that contains a phosphor comprising a host lattice of general formula (Y,Lu,Sc,A)POwherein 0&#x2266;x&#x3c;1 and 0&#x3c;y&#x2266;1 and 0&#x2266;z&#x3c;0.05, where A is an activator selected from the group of bismuth, praseodymium and neodymium.

Device for generating UVC radiation

An illumination system includes a radiation source capable of emitting primary radiation and a luminescent material. The luminescent material includes a blend of a first phosphor capable of converting the primary radiation into a broad-band emission in the yellow range of the electromagnetic spectrum, and a second phosphor capable of converting the primary radiation into a multiple narrow-band emission in the red and green range of the electromagnetic spectrum.

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Aachen, Germany

Jorg Meyer