Abstract: An arrangement for emitting mixed light including a primary and secondary radiation with at least one first electroluminescent light-source for emitting first primary radiation, at least one second electroluminescent light-source for emitting second primary radiation, and a light-converting element for absorbing at least one of the primary radiations and re-emitting the secondary radiation. The light-converting element is arranged so that the entire proportion of primary radiation in the mixed light passes through the light-converting element. The light-converting element is a ceramic light-converting material whose microstructure is selected to be such that the color point of the mixed light of primary and second radiation is substantially independent of the angle of viewing.

Abstract: An illumination device includes an active layer, such as a blue LED, covered with a first luminescent ceramic converter layer and partially covered with a second luminescent ceramic converter layer. The first and second conversion layers convert primary photons emitted by the active layer into photons of different, longer wavelengths. The color point of the illumination device can be adjusted by adjusting the relative size of the second conversion layer.

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.

Abstract: An arrangement for emitting mixed light including a primary and secondary radiation with at least one first electroluminescent light-source for emitting first primary radiation, at least one second electroluminescent light-source for emitting second primary radiation, and a light-converting element for absorbing at least one of the primary radiations and re-emitting the secondary radiation. The light-converting element is arranged so that the entire proportion of primary radiation in the mixed light passes through the light-converting element. The light-converting element is a ceramic light-converting material whose microstructure is selected to be such that the color point of the mixed light of primary and second radiation is substantially independent of the angle of viewing.

Abstract: The invention relates to an improved green emitting material of the form MI3-x-yMIIx Si6-xAlxO12N2:Euy, whereby MI is an earth alkali metal and MII is a rare earth metal or Lanthanum. This material can be made as a ceramic using a low temperature sintering step, resulting in a better and more uniform ceramic body.

Abstract: A UVB phosphor of the composition (Laj_,,—y—,Gd,,Yy)PO4:Ce, is described, in which x=0 to 0.5, y=0 to 0.5 and z=0.01 to 0.3 and the sum of x, y and z is less than 1. From a phosphor of this kind, a phosphor layer can be produced that, in fluorescent lamps based on low-pressure mercury discharge lamps, produces a spectrum of 5 UV light that is particularly well suited to the cosmetic or medical treatment of the skin.

Abstract: A 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 includes a CaAlSiN light converting material with a transmissivity of ?10% to ?80% for a light in the wavelength range from ?580 to ?1000 nm.

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 behavior.

Abstract: The invention relates to an illumination system having a light scattering and conversion plate comprising a non-converting but scattering layer and a thinner converting layer. By separating scattering and conversion, the characteristics of the illumination system can greatly be increased.

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 concerns an illumination system for generation of colored, especially amber or red light, comprising a radiation source and a fluorescent 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 amber to red emitting a rare earth metal-activated oxonitridoalumosilicate of general formula (Ca1?x?y?zSrxBayMgz)1?n(Al1?a+bBa)Si1?bN3?bOb:Ren, wherein 0?x?1, 0?y?1, 0?z?1, 0?a?1, 0<b?1 and 0.002?n?0.2 and RE is selected from europium(II) and cerium(III).

Abstract: A light emission diode (LED) assembly, comprising a LED die (10), a phosphor layer (12), and a filter layer (14), wherein said filter layer (14) is developed in such a manner that light rays with a wavelength of about 400 nm to 500 nm, preferably of about 420 nm to 490 nm, emitted from the LED die (10) are at least partially reflected depending on their emission angle to the normal on the filter layer (14). With the inventive LED assembly it is possible to provide a LED assembly which solves the yellow ring problem without a reduction of the efficiency of the LED assembly.

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: An electroluminescent device comprising at least one electroluminescent light source (2) with an electroluminescent layer (21) for emitting a primary radiation with an emission characteristic around a mean emission direction (5), and at least one light-converting element (3) for converting at least part of the primary radiation into a secondary radiation, wherein the shape of the light-converting element (3) is adapted to the emission characteristic of the electroluminescent light source (2) so as to generate a defined correlated color temperature as a function of a viewing angle (10).

Abstract: The invention concerns an illumination system for generation of colored, especially amber or red light, comprising a radiation source and a fluorescent 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 amber to red emitting a rare earth metal-activated oxonitridoalumosilicate of general formula (Ca1?x?y?zSrxBayMgz)1?n(Al1?a+bBa)Si1?bN3?bOb:REn, wherein 0?x?1, 0?y?1, 0?z?1, 0?a?1, 0<b?1 and 0.002?n?0.2 and RE is selected from europium(II) and cerium(III).

Abstract: The invention concerns an illumination system for generation of colored, especially amber or red light, comprising a radiation source and a fluorescent 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 amber to red emitting a rare earth metal-activated oxonitridoalumosilicate of general formula (Ca1-x-y-zSrxBayMgz)1-n(Al1-a+bBa)Si1-bN3-bOb:Ren, wherein 0?x?1, 0?y?1, 0?z?1, 0?a?1, 0<b?1 and 0.002?n?0.2 and RE is selected from europium(II) and cerium(III).

Abstract: A ceramic body is disposed in a path of light emitted by a light source. The light source may include a semiconductor structure comprising a light emitting region disposed between an n-type region and a p-type region. The ceramic body includes a plurality of first grains configured to absorb light emitted by the light source and emit light of a different wavelength, and a plurality of second grains. For example, the first grains may be grains of luminescent material and the second grains may be grains of a luminescent material host matrix without activating dopant.

Abstract: A ceramic body is disposed in a path of light emitted by a light source. The light source may include a semiconductor structure comprising a light emitting region disposed between an n-type region and a p-type region. The ceramic body includes a plurality of first grains configured to absorb light emitted by the light source and emit light of a different wavelength, and a plurality of second grains. For example, the first grains may be grains of luminescent material and the second grains may be grains of a luminescent material host matrix without activating dopant.

Abstract: The invention relates to a red emitting material of the composition a(MIIN2/3)*b(MIIIN)*c(MIVN4/3)*d1CeO3/2*d2EuO*xMIVO2*yMIIIO3/2 with Cerium and Europium present in the material. This material has been found to have an increased lumen equivalent and absorption efficiency of blue light.

Abstract: A white light LED is described that uses an LED die that emits visible blue light in a wavelength range of about 450-470 nm. A red phosphor or quantum dot material converts some of the blue light to a visible red light having a peak wavelength between about 605-625 nm with a full-width-half-maximum (FWHM) less than 80 nm. A green phosphor or quantum dot material converts some of the blue light to a green light having a FWHM greater than 40 nm, wherein the combination of the blue light, red light, and green light produces a white light providing a color rendering of Ra,8>90 and a color temperature of between 2500K-5000K. Preferably, the red and green converting material do not saturate with an LED die output of 100 W/cm2 and can reliably operate with an LED die junction temperature over 100 degrees C.