Abstract: A method for producing a ceramic converter element is provided. The method includes providing a phosphor as a starting material, mixing the phosphor and at least one metal oxide powder to form a mixture, and processing the mixture to form a ceramic converter material in which the phosphor is embedded in a ceramic matrix. Further, an optoelectronic component with a ceramic converter element and a ceramic converter element are provided.

Abstract: An alumina-based ceramic wavelength converter is described having a surface layer containing a second phase of alumina, preferably as alumina crystallites. The surface layer is formed as a result of the sintering process used to form the bulk ceramic which is itself substantially transparent. The ceramic wavelength converter is combined with a light emitting diode to form a light emitting device. Preferably, the ceramic wavelength converter is comprised of an alumina-based phosphor represented by a general formula A3B5O12:Ce, wherein A is Y, Sc, La, Gd, Lu, or Tb and B is Al, Ga or Sc.

Abstract: There is herein described a method for forming a ceramic wavelength converter assembly which achieves a direct bonding of an alumina-based ceramic wavelength converter to an alumina-based ceramic substrate such as polycrystalline or sapphire. The method comprises applying a silica-containing layer between the converter and the substrate and then applying heat to bond the converter to the substrate to form the ceramic wavelength converter assembly. Because direct bonding is achieved, the ceramic wavelength converter may operate at much higher incident light powers than conventional silicone glue-bonded converters.

Abstract: An alumina-based ceramic wavelength converter is described having a surface layer containing a second phase of alumina, preferably as alumina crystallites. The surface layer is formed as a result of the sintering process used to form the bulk ceramic which is itself substantially transparent. The ceramic wavelength converter is combined with a light emitting diode to form a light emitting device. Preferably, the ceramic wavelength converter is comprised of an alumina-based phosphor represented by a general formula A3B5O12:Ce, wherein A is Y, Sc, La, Gd, Lu, or Tb and B is Al, Ga or Sc.

Abstract: The present invention relates to a luminescent ceramic converter comprising a sintered, monolithic ceramic material that converts a light of a first wavelength to a light of a second wavelength, the ceramic material having substantially spherically shaped pores. The present invention also relates to methods for the manufacture of the luminescent ceramic converter that comprises the ceramic material having substantially spherically shaped pores.

Abstract: There is herein described a luminescent ceramic converter that comprises a flat, monolithic piece of a ceramic material containing a luminescent species wherein a concentration of the luminescent species in a peripheral region of the converter is lower than in a central region of the converter.

Abstract: The present invention relates to a luminescent ceramic converter comprising a sintered, monolithic ceramic material that converts a light of a first wavelength to a light of a second wavelength, the ceramic material having substantially spherically shaped pores. The present invention also relates to methods for the manufacture of the luminescent ceramic converter that comprises the ceramic material having substantially spherically shaped pores.

Abstract: There is herein described a luminescent ceramic converter that comprises a flat, monolithic piece of a ceramic material containing a luminescent species wherein a concentration of the luminescent species in a peripheral region of the converter is lower than in a central region of the converter.

Abstract: An alumina multilayer wiring substrate having a high capacitance in the substrate on which a VLSI is to be mounted to effectively eliminate electrical noise(s) which may hinder the operation of the VLSI at high speed (frequency). The wiring substrate comprises: (a) a first alumina layer; (b) a first metallized layer on the first alumina layer; (c) a dielectric material layer on the first metallized layer; (d) a cermet layer on the dielectric material layer; (e) a second metallization layer on the cermet layer; (f) a second alumina layer on the second metallization layer; (g) a first conductor electrically connecting to and extending from the second metallized layer through the second alumina layer; and (h) a second conductor electrically extending from the first metallized layer through the cermet layer and dielectric material layer, through but not electrically connecting the first metallized layer, and through the second alumina layer.

Abstract: A process for increasing the colorizing effect of known colorizing oxides in an alumina body. The process includes the steps of (a) forming a glass frit containing colorants; (b) mixing the frit and alumina to form a green mixture; and (c) firing the mixture to form a fired ceramic body.