Abstract: The invention relates to a ceramic luminescent material for LEDs with reduced scattering made by a uniaxial hot-pressing step.

Abstract: The invention relates to a light emitting device, especially a LED comprising a green emitting material of the composition Sr5?y?z?aMySi23?xAl3+xOx+2aN37?x?2a:Euz:Cez1. This material has been found to have a narrow emission in the green wavelight range together with a good producibility and stability.

Abstract: The invention relates to a light emitting device comprising a light source, especially a LED, and a luminescent material, which is a ceramic multiphase material essentially of the composition M2?zCezSi5?x?y?(z?z1)Ay+(z?z1)N9?4x?y+z1O4x+y?z1.

Abstract: An illumination system comprising a radiation source and a monolithic ceramic luminescence converter comprising a composite material of at least one luminescent compound, and at least one non-luminescent compound, wherein the material of the non-luminescent compound comprises silicon and nitrogen, is advantageously used, when the luminescent compound comprises an rare-earth metal-activated host compound also comprising silicon and nitrogen. Shared chemical characteristics of the luminescent compound and the non-luminescent material improve phase assemblage, thermal and optical behavior. The invention relates also to a composite monolithic ceramic luminescence converter.

Abstract: The invention relates to an improved red light emitting material of the formula M1?yA1+xSi4?xN7?x?2yOx+2y: RE whereby M is selected out of the group comprising Ba, Sr, Ca, Mg or mixtures thereof, A is selected out of the group comprising Al, Ga, B or mixtures thereof, RE is selected out of the group comprising rare earth metals, Y, La, Sc or mixtures thereof and x is ?0 and ?1 and y is ?0 and ?0.2. This material is believed to crystallize in a novel structure type that comprises two individual lattice sites for rare 10 earth metal incorporation, which leads to an improved lighting behaviour.

Abstract: An arrangement for emitting mixed light (5) comprising primary and secondary radiation (51, 52, 53) in a mean direction of emission (5), comprising at least one first electroluminescent light-source (21) for emitting first primary radiation (51) having a maximum intensity at a first wavelength, at least one second electroluminescent light-source (22) for emitting second primary radiation (52) having a maximum intensity at a second wavelength greater than the first wavelength, and a light-converting element (3) for absorbing at least one of the primary radiations (52, 53) and re-emitting the secondary radiation (53), which light-converting element (3) is so arranged that the entire proportion of primary radiation (51, 52) in the mixed light passes through the light-converting element (3), and that the light-converting element (3) comprises a ceramic light-converting material whose microstructure is selected to be such that the color point of the mixed light (5) comprising primary and second radiation is substa

Abstract: The invention relates to a tri-color lamp for generating white light comprising a phosphor composition comprising a phosphor of general formula (Ba1-x-y-z-SrxCay)2SiO4:Euz, wherein 0?x?1, 0?y?1 and 0<z<1. The phosphor composition may also comprise a red phosphor. The two phosphors can absorb radiation emitted by a light emitting diode, particularly a blue LED. This arrangement provides a mixing of three light sources—light emitted from the two phosphors and unabsorbed light from the LED. The invention also relates to an alternative to a green LED comprising a single green phosphor of general formula (Ba1-x-y-z-SrxCay)2SiO4:Euz, wherein 0?x?0 1, 0?y?1 and 0<z<1, that absorbs radiation from a blue LED. A resulting device provides green light of high absorption efficiency and high luminous equivalent values.

Abstract: The invention relates to an illumination device (10) that comprises an active layer (11), for example a blue LED, covered with a first luminescent ceramic converter layer (12) and partially covered with a second luminescent ceramic converter layer (13). The first and second conversion layers (12, 13) convert primary photons (?p) emitted by the active layer (11) into photons of different, longer wavelengths (?1, ?2), wherein the color point of the illumination device (10) can be adjusted by adjusting the relative size of the second conversion layer (13).

Abstract: A semiconductor light emitting device is combined with a wavelength converting material. The semiconductor light emitting device is configured to emit first light of a first peak wavelength. The wavelength converting material is configured to absorb at least a portion of the first light and emit second light of a second peak wavelength. In some embodiments, the first wavelength converting material is (Ba1-xSrx)2-y-0.5zSi5N8-zOz:Euy2+ where 0.2<x<0.3, (Ba1-xCax)2-y-0.5zSi5N8-zOz:Euy2+ where 0.01<x<0.2, or M2Si5-aAaN8-aOa:Eu2+ where M=Sr, Ba, Ca; A=Al, B, Ga, Sc; and 0.01<a<0.2.

Abstract: An illumination system comprising a radiation source and a composite monolithic ceramic luminescence converter comprising a composite luminescent material comprising at least one first phosphor and at least one second phosphor capable of absorbing a part of the light emitted by the radiation source and emitting light of a wavelength different from that of the absorbed light provides improved light mixing and chromaticity control of the emitted light mixture. The invention relates also to a composite monolithic ceramic luminescence converter and a method of manufacturing such composite monolithic ceramic luminescence converter.

Abstract: The invention relates to an improved red light emitting material of the formula MI4?xMIIXSi6N10+xO1?x This material opens the way to single phosphor warm white emitting LEDs as could be found with the material Ba1.746Ca2.134Si6N10.08O0.92:Eu0.04Ce0.08.

Abstract: The invention relates to a tri-color lamp for generating white light comprising a phosphor composition comprising a phosphor of general formula (Ba1?x?y?z?SrxCay)2SiO4:Euz, wherein 0?x?1, 0?y?1 and 0<z<1. The phosphor composition may also comprise a red phosphor. The two phosphors can absorb radiation emitted by a light emitting diode, particularly a blue LED. This arrangement provides a mixing of three light sources—light emitted from the two phosphors and unabsorbed light from the LED. The invention also relates to an alternative to a green LED comprising a single green phosphor of general formula (Ba1?x?y?z ?SrxCay)2SiO4:Euz, wherein 0?x?1, 0?y?1 and 0<z<1, that absorbs radiation from a blue LED. A resulting device provides green light of high absorption efficiency and high luminous equivalent values.

Abstract: An illumination system includes a radiation source and a fluorescent material including 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. The phosphor includes a yellow red-emitting cerium-activated carbido-nitridosilicate of general formula (RE1?z)2?aEAaSi4N6+aC1?a:Cez where 0?a<1, 0<z?0.2, EA is at least one earth alkaline metal selected from the group of calcium, strontium and barium, and RE is a least one rare earth metal chosen from the group of yttrium, gadolinium and lutetium. The phosphor may include a red to yellow-emitting cerium-activated carbido-nitridosilicate of general formula (RE1?z)2?aEAa Si4N6+aC1?a:Cez where 0?a<1, 0<z?0.2, EA is at least one earth alkaline metal selected from the group of calcium, strontium and barium, and RE is a least one rare earth metal chosen from the group of yttrium, gadolinium and lutetium.

Abstract: A semiconductor structure including a light emitting layer disposed between an n-type region and a p-type region is attached to a compound substrate including a host which provides mechanical support to the device and a ceramic layer including a luminescent material. In some embodiments the compound substrate includes a crystalline seed layer on which the semiconductor structure is grown. The ceramic layer is disposed between the seed layer and the host. In some embodiments, the compound substrate is attached to the semiconductor structure after growth of the structure on a conventional growth substrate. In some embodiments, the compound substrate is spaced apart from the semiconductor structure and does not provide mechanical support to the structure. In some embodiments, the ceramic layer has a thickness less than 500 ?m.

Abstract: The invention relates to a light emitting device, in particular discharge lamps with inner or outer electrodes or electrodeless in which the emittance of red light is enhanced by using a monolithic ceramic luminescence converter.

Abstract: A semiconductor structure including a light emitting layer disposed between an n-type region and a p-type region is attached to a compound substrate including a host which provides mechanical support to the device and a ceramic layer including a luminescent material. In some embodiments the compound substrate includes a crystalline seed layer on which the semiconductor structure is grown. The ceramic layer is disposed between the seed layer and the host. In some embodiments, the compound substrate is attached to the semiconductor structure compound substrate is spaced apart from the semiconductor structure and does not provide mechanical support to the structure. In some embodiments, the ceramic layer has a thickness less than 500 ?m.

Abstract: The invention relates to a luminescent material comprising a luminescent particle (20) for generating light (4), wherein the luminescent particle (20) has a structured particle surface for effectively outcoupling the light (4) generated within the luminescent particle (20). Furthermore, the invention relates to a light source comprising a luminescent material according to the invention and a device for exciting the luminescent material.

Abstract: Light emitting device with a light source to emit primary light and a light conversion layer to convert at least a part of the primary light into secondary light comprising a CaAlSiN light converting material with a transmissivity of >10% to ?80% for a light in the wavelength range from >580 to ?lOOOnm.

Abstract: A low-pressure mercury vapor discharge lamp has a light-transmitting discharge vessel (10) enclosing, in a gastight manner, a discharge space (13) provided with a filling of mercury and a rare gas. The discharge vessel comprises discharge means for maintaining a discharge in the discharge space. The discharge vessel is provided with a luminescent layer (17) comprising a mixture of at least a red and a green luminescent material. The red luminescent material comprises (Y,Gd)2O3:Eu. The green luminescent material comprises (Ba,Ca,Sr)2SiO4:Eu and/or (Sr,Ca,Ba,Mg,Zn)Si2N2O2:Eu. Particles of the green luminescent material are surrounded by a coating of aluminum oxide. Preferably, at least 50% of the particles of the green and red luminescent materials have an average diameter greater than or equal to approximately 5 ?m. The mixture of the red and green luminescent materials render a low-pressure mercury-vapor discharge lamp with an improved lumen equivalent.

Abstract: A phosphor-converted electroluminescent device comprising an electroluminescent light source (LED 2), for emitting primary radiation, a light-converting element (3) having a phosphor material for at least partly converting the primary radiation into secondary radiation, and a filter layer (7a, 7b, 7c, 7d) for absorbing that secondary radiation incident on the filter layer (7a, 7b, 7c, 7d) that lies beyond at least one boundary wavelength in the spectrum of the emitted secondary radiation.