Abstract: The present invention relates to a ceramic composite light-converting member which is a solidified body having a texture of at least two or more oxide phases being continuously and three-dimensionally entangled with each other, where at least one of the oxide phases is a fluorescence-emitting phase and the composition as a whole is represented by: x.AlO3/2-y.(a.YO3/2-b.GdO3/2-c.CeO2) [wherein x, y, a, b and c are each a molar fraction and satisfy 0.750<x<0.850, 0<b<0.8, 0<c<0.3, x+y=1 and a+b+c=1]; or x.AlO3/2-y.(a.YO3/2-c.CeO2) (wherein x, y, a, b and c are each a molar fraction and satisfy 0.750<x<0.850, 0.125?c<0.3, x+y=1 and a+c=1). The ceramic composite light-converting member enables emitting light adjusted to a peak wavelength of 540 to 580 nm and fabricating a high-efficiency white light-emitting device by combining it with a blue light-emitting element.

Abstract: A light-converting ceramic composite comprising a solidified body having a texture of at least two or more oxide phases being continuously and three-dimensionally entangled together, with at least one of the oxide phases being a fluorescence-emitting crystal phase, wherein the interface length between the oxide phases per 1 mm2 of a plane in the light-converting ceramic composite is from 150 to 1,500 mm.

Abstract: A light conversion structure ensuring good light transmission and less deterioration and capable of controlling light to a desired color tone and emitting a highly bright light, and a light-emitting device using the same. The light conversion structure is a light conversion structure including a layer formed of a ceramic composite, which absorbs a part of a first light to emit a second light and transmits a part of the first light, and a fluorescent layer for the control of color tone, which is formed on the surface of the ceramic composite and which absorbs a part of the first light or a part of the second light to emit a third light and transmits a part of the first light or a part of the second light, wherein the ceramic composite includes a solidified body where at least two or more metal oxide phases are formed continuously and three-dimensionally entangled with each other, and at least one metal oxide phase in the solidified body includes a metal element oxide capable of emitting fluorescence.

Abstract: The light-emitting diode is a light-emitting diode including a light-converting material substrate and a semiconductor layer formed on the light-converting material substrate, wherein the light-converting material substrate includes a solidified body in which at least two or more oxide phases selected from a simple oxide and a complex oxide are formed continuously and three-dimensionally entangled with each other, at least one oxide phase in the solidified body comprises a metal element capable of emitting fluorescence, and the semiconductor layer includes a plurality of compound semiconductor layers and has at least a light-emitting layer capable of emitting visible light.

Abstract: A substrate for light-emitting diodes, obtained by stacking a single crystal layer to form a light-emitting diode element onto a ceramic composite layer for light conversion, the ceramic composite layer having been formed by a unidirectional solidification method so that the ceramic composite layer comprises a solidified body having formed therein at least two or more oxide phases selected from single metal oxides and complex metal oxides to be continuously and three-dimensionally entangled with each other, with each oxide phase having a single crystal orientation, wherein at least one oxide phase out of the oxide phases in the solidified body contains a metal element oxide capable of emitting fluorescence.

Abstract: The present invention relates to a ceramic composite light-converting member which is a solidified body having a texture of at least two or more oxide phases being continuously and three-dimensionally entangled with each other, where at least one of the oxide phases is a fluorescence-emitting phase and the composition as a whole is represented by: x.AlO3/2-y.(a.YO3/2-b.GdO3/2-c.CeO2) [wherein x, y, a, b and c are each a molar fraction and satisfy 0.750<x<0.850, 0<b<0.8, 0<c<0.3, x+y=1 and a+b+c=1]; or x.AlO3/2-y.(a.YO3/2-c.CeO2) (wherein x, y, a, b and c are each a molar fraction and satisfy 0.750<x<0.850, 0.125?c<0.3, x+y=1 and a+c=1). The ceramic composite light-converting member enables emitting light adjusted to a peak wavelength of 540 to 580 nm and fabricating a high-efficiency white light-emitting device by combining it with a blue light-emitting element.

Abstract: A light-converting ceramic composite comprising a solidified body having a texture of at least two or more oxide phases being continuously and three-dimensionally entangled together, with at least one of the oxide phases being a fluorescence-emitting crystal phase, wherein the interface length between the oxide phases per 1 mm2 of a plane in the light-converting ceramic composite is from 150 to 1,500 mm.

Abstract: A white-light light emitting diode device comprising a light emitting diode element capable of emitting violet light at a wavelength of 400 to 419 nm and a ceramic composite material, wherein the ceramic composite material is a solidified body in which a cerium-activated Y3Al5O12 (Y3Al5O12:Ce) crystal and an ?-type aluminum oxide (Al2O3) crystal are continuously and three-dimensionally entangled with each other, the solidified body having not only a photoluminescent property of wavelength-converting a part of the violet light into yellow light but also a function of transmitting a part of the violet light, and the violet light transmitted through the ceramic composite material and yellow light resulting from wavelength conversion by the ceramic composite material are mixed to emit pseudo-white light.

Abstract: A substrate for light-emitting diodes, which uses no fluorescent powder, enables formation of a good light-emitting diode element, resulting in less deterioration, transmits light of the light-emitting diode element, emits light by utilizing a part of the transmitted light, and allows the transmitted light and newly emitted light to be mixed and emitted, is provided. The substrate for light-emitting diodes of the present invention is a substrate for light-emitting diodes, obtained by stacking a single crystal layer enabling to form a light-emitting diode element thereon and a ceramic composite layer for light conversion comprising a solidified body having formed therein at least two or more oxide phases selected from a single metal oxide and a complex metal oxide to be continuously and three-dimensionally entangled with each other, wherein at least one oxide phase out of oxide phases in the solidified body contains a metal element oxide capable of emitting fluorescence.

Abstract: The light-emitting diode is a light-emitting diode including a light-converting material substrate and a semiconductor layer formed on the light-converting material substrate, wherein the light-converting material substrate includes a solidified body in which at least two or more oxide phases selected from a simple oxide and a complex oxide are formed continuously and three-dimensionally entangled with each other, at least one oxide phase in the solidified body comprises a metal element capable of emitting fluorescence, and the semiconductor layer includes a plurality of compound semiconductor layers and has at least a light-emitting layer capable of emitting visible light.

Abstract: A light conversion structure ensuring good light transmission and less deterioration and capable of controlling light to a desired color tone and emitting a highly bright light, and a light-emitting device using the same. The light conversion structure is a light conversion structure including a layer formed of a ceramic composite, which absorbs a part of a first light to emit a second light and transmits a part of the first light, and a fluorescent layer for the control of color tone, which is formed on the surface of the ceramic composite and which absorbs a part of the first light or a part of the second light to emit a third light and transmits a part of the first light or a part of the second light, wherein the ceramic composite includes a solidified body where at least two or more metal oxide phases are formed continuously and three-dimensionally entangled with each other, and at least one metal oxide phase in the solidified body includes a metal element oxide capable of emitting fluorescence.

Abstract: A white-light light emitting diode device comprising a light emitting diode element capable of emitting violet light at a wavelength of 400 to 419 nm and a ceramic composite material, wherein the ceramic composite material is a solidified body in which a cerium-activated Y3Al5O12 (Y3Al5O12:Ce) crystal and an ?-type aluminum oxide (Al2O3) crystal are continuously and three-dimensionally entangled with each other, the solidified body having not only a photoluminescent property of wavelength-converting a part of the violet light into yellow light but also a function of transmitting a part of the violet light, and the violet light transmitted through the ceramic composite material and yellow light resulting from wavelength conversion by the ceramic composite material are mixed to emit pseudo-white light.

Abstract: A dielectric ceramic composition mainly comprises a major component which comprises barium, titanium, neodymium, samarium and oxygen and is represented by the following compositional formula:xBaO-yTiO.sub.2 -zNd.sub.2 O.sub.3 -tSm.sub.2 O.sub.3wherein 0.1.ltoreq.x.ltoreq.0.2; 0.5.ltoreq.y.ltoreq.0.8; 0.01.ltoreq.z.ltoreq.0.2; 0.ltoreq.t.ltoreq.0.2, provided that x+y+z+t=1); and a minor component mainly comprising glass powder having a softening point of about 100.degree. to about 500.degree. C., which mainly comprises PbO, ZnO and B.sub.2 O.sub.3, and GeO.sub.2, and wherein the content (a) (% by weight) of the glass powder falls within the range of 1.ltoreq.a.ltoreq.25 and the content (b) (% by weight) of GeO.sub.2 falls within the range of 0.5.ltoreq.b.ltoreq.10, on the basis of the weight of the major component. The major component may further comprise Bi.sub.2 O.sub.3 and the composition may comprise bismuth as a minor component.