Phosphor and light-emitting device

Abstract

A phosphor has the general formula (M 2 x ,M 3 y ,M 4 z ) m M 1 O 3 X (2/n) , wherein M 1 represents at least one element including at least Si and selected from the group consisting of Si, Ge, Ti, Zr, and Sn, M 2 represents at least one element including at least Ca and selected from the group consisting of Ca, Mg, Cd, Co, and Zn, M 3 represents at least one element including at least Sr and selected from the group consisting of Sr, Ra, Ba, and Pb, X represents at least one halogen element, M 4 represents at least one element including at least Eu 2+ and selected from the group consisting of rare-earth elements and Mn, m is in the range 1≦m≦4/3, n is in the range 5≦n≦7.

1 . A phosphor having the general formula (M 2   x ,M 3   y ,M 4   z ) m M 1 O 3 X (2/n) , wherein M 1  represents at least one element including at least Si and selected from the group consisting of Si, Ge, Ti, Zr, and Sn, M 2  represents at least one element including at least Ca and selected from the group consisting of Ca, Mg, Cd, Co, and Zn, M 3  represents at least one element including at least Sr and selected from the group consisting of Sr, Ra, Ba, and Pb, X represents at least one halogen element, M 4  represents at least one element including at least Eu 2+  and selected from the group consisting of rare-earth elements and Mn, m is in the range 1≦m≦4/3, n is in the range 5≦n≦7, and x, y, and z are each in such a range as to satisfy x+y+z=1, 0.45≦x≦0.8, 0.05≦y≦0.45, and 0.03≦z≦0.35. 
     
     
         2 . A light-emitting device, comprising:
 a light-emitting element which emits ultraviolet light or short-wavelength visible light;   a first phosphor which is excited by the ultraviolet light or the short-wavelength visible light to emit visible light; and   a second phosphor which is excited by the ultraviolet light or the short-wavelength visible light to emit visible light of a color different from that of the visible light emitted from the first phosphor,   the light-emitting device being configured to produce a mixed color by mixing light beams from the respective phosphors, wherein   the first phosphor has the general formula (M 2   x ,M 3   y ,M 4   z ) m M 1 O 3 X (2/n) , wherein M 1  represents at least one element including at least Si and selected from the group consisting of Si, Ge, Ti, Zr, and Sn, M 2  represents at least one element including at least Ca and selected from the group consisting of Ca, Mg, Cd, Co, and Zn, M 3  represents at least one element including at least Sr and selected from the group consisting of Sr, Ra, Ba, and Pb, X represents at least one halogen element, M 4  represents at least one element including at least Eu 2+  and selected from the group consisting of rare-earth elements and Mn, m is in the range 1≦m≦4/3, n is in the range 5≦n≦7, and x, y, and z are each in such a range as to satisfy x+y+z =1, 0.45≦x≦0.8, 0.05≦y≦0.45, and 0.03≦z≦0.35.   
     
     
         3 . A light-emitting device, comprising:
 a semiconductor light-emitting element which emits ultraviolet light or short-wavelength visible light;   a first phosphor which is excited by the ultraviolet light or the short-wavelength visible light to emit visible light; and   a second phosphor which is excited by the ultraviolet light or the short-wavelength visible light to emit visible light of a color different from that of the visible light emitted from the first phosphor,   the light-emitting device being configured to emit light with a color temperature of from 2,800 K to 3,200 K by using light from each phosphor.   
     
     
         4 . The light-emitting device according to  claim 3 , which is further configured to emit light so that an illuminance of 50 lx or more can be provided at a place 70 cm away from the device when a power of 1 W is supplied to the device.