A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
OPTICAL WAVELENGTH CONVERSION MEMBER AND LIGHT-EMITTING DEVICE
An optical wavelength conversion member and a light-emitting device, each of which exhibits high illuminance, high fluorescence intensity, and reduced color unevenness, are provided. An optical wavelength conversion member 9 is formed of a ceramic sintered body having a fluorescent phase containing fluorescent crystal grains as a main component and a translucent phase containing translucent crystal grains as a main component. Crystal grains of the fluorescent phase have a composition represented by formula ABO:Ce, and each of the element A and the element B is at least one element selected from the following element groups. Specifically, the element A is selected from "Sc, Y, and lanthanoids (except for Ce)," and the element B is selected from "Al and Ga." In the optical wavelength conversion member 9, the following relations are satisfied: 0.3 < a < 34 and 300 µm < y < 1,050 µm, wherein a represents the ratio of the area of the translucent phase to the area of the fluorescent phase in a cross section of the optical wavelength conversion member 9, and y represents the interfacial length of the fluorescent phase.
OPTICAL WAVELENGTH CONVERSION MEMBER AND LIGHT-EMITTING DEVICE
An optical wavelength conversion member and a light-emitting device, each of which exhibits high illuminance, high fluorescence intensity, and reduced color unevenness, are provided. An optical wavelength conversion member 9 is formed of a ceramic sintered body having a fluorescent phase containing fluorescent crystal grains as a main component and a translucent phase containing translucent crystal grains as a main component. Crystal grains of the fluorescent phase have a composition represented by formula ABO:Ce, and each of the element A and the element B is at least one element selected from the following element groups. Specifically, the element A is selected from "Sc, Y, and lanthanoids (except for Ce)," and the element B is selected from "Al and Ga." In the optical wavelength conversion member 9, the following relations are satisfied: 0.3 < a < 34 and 300 µm < y < 1,050 µm, wherein a represents the ratio of the area of the translucent phase to the area of the fluorescent phase in a cross section of the optical wavelength conversion member 9, and y represents the interfacial length of the fluorescent phase.
OPTICAL WAVELENGTH CONVERSION MEMBER AND LIGHT-EMITTING DEVICE
OPTISCHES WELLENLÄNGENUMWANDLUNGSELEMENT UND LICHTEMITTIERENDE VORRICHTUNG
ÉLÉMENT DE CONVERSION DE LONGUEUR D'ONDE ET DISPOSITIF ÉLECTROLUMINESCENT
TAKAKU SHOHEI (author) / KATSU YUSUKE (author) / ITO TSUNEYUKI (author) / SHIMURA YUKI (author) / MITSUOKA TAKESHI (author) / MOTEKI JUN (author)
2021-12-22
Patent
Electronic Resource
English
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