Phosphor and manufacturing method therefore, and light emission device using the phosphor

Abstract

Provided is the phosphor expressed by a general composition formula MmAaBbOoNn:Z (where element M is one or more kinds of elements having bivalent valency, element A is one or more kinds of elements having tervalent valency, element B is one or more kinds of elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is one or more kinds of activators.), satisfying 4.0<(a+b)/m<7.0, a/m≧0.5, b/a>2.5, n>o, n=2/3m+a+4/3b−2/3o, and having an emission spectrum with a peak wavelength of 500 nm to 650 nm when excited by light in a wavelength range from 300 nm to 500 nm.

1 . A phosphor of the composition formula MmAaBbOoNn:Z, wherein element M is at least one element having bivalent valency selected from the group consisting of Mg, Ca, Sr, Ba, and Zn, element A is Al, element B is Si, O is oxygen, N is nitrogen, and element Z is Eu, Ce of a mixture thereof, satisfying 4.0<(a+b)/m<7.0, a/m≧0.5, b/a>2.5, n>o, n=2/3 m+a+4/3b−2/3o, wherein when excited by light in a wavelength range from 300 nm to 500 nm, the phosphor has an emission spectrum with a peak wavelength in a range from 500 nm to 650 nm. 
     
     
         2 . The phosphor according to  claim 1 , wherein when the composition formula is MmAaBbOoNn:Zz, the value of z/(m+z), which is a molar ratio of the element M to the element Z, is 0.0001 or more and 0.5 or less. 
     
     
         3 . The phosphor according to  claim 1 , containing Sr of 19.5 to 29.5 wt %, Al of 5.0 to 16.8 wt %, O of 0.5 to 8.1 wt %, N of 22.6 to 32.0 wt %, and Ce of 0 to 3.5 wt %, wherein when the phosphor is irradiated with more than one kind of monochromatic light or continuous light in the wavelength range from 350 nm to 500 nm as an excitation light, a peak wavelength in the emission spectrum is in a range from 500 to 600 nm, and x of chromaticity (x, y) of the emission spectrum is in a range from 0.3000 to 0.4500, and y of the chromaticity (x, y) is in a range from 0.5000 to 0.6000. 
     
     
         4 . The phosphor according to  claim 1 , containing Sr of 19.5 to 29.5 wt %, Al of 5.0 to 16.8 wt %, O of 0.5 to 8.1 wt %, N of 22.6 to 32.0 wt %, and Eu of 0 to 3.5 wt %, wherein when the phosphor is irradiated with more than one kind of monochromatic light or continuous light in a wavelength range from 350 nm to 500 nm as an excitation light, the peak wavelength of the emission spectrum is in a range from 550 to 650 nm, and x of the chromaticity of the emission spectrum (x, y) is in a range from 0.4500 to 0.6000, and y of the chromaticity of the emission spectrum (x, y) is in a range from 0.3500 to 0.5000. 
     
     
         5 . The phosphor according to  claim 4 , wherein when the phosphor is irradiated with the monochromatic light having the wavelength range from 350 nm to 500 nm as an excitation light, the relation of PH and PL satisfies (PH−PL)/PH×100 20, when a peak intensity of a maximum peak in a spectrum of light emission that occurs by absorbing the excitation light that makes it highest is defined as PH, and the peak intensity of the maximum peak in the spectrum of light emission that occurs by absorbing the excitation light that makes it smallest is defined as PL. 
     
     
         6 . The phosphor according to  claim 1 , wherein when the value of relative intensity of the maximum peak in the emission spectrum is defined as P25 when the phosphor is irradiated with a specified monochromatic light in the wavelength range from 300 nm to 500 nm at 25° C. as the excitation light, and the value of the relative intensity of the maximum peak is defined as P200 when the phosphor is irradiated with the specified monochromatic light as the excitation light at 200° C. the relation of P25 and P200 satisfies (P25−P200)/P25×100 35. 
     
     
         7 . The phosphor according to  claim 1 , containing a primary particle with particle size of 50 m or less and aggregates in which the primary particle agglutinates, wherein an average particle size (D50) of the powdery phosphor containing the primary particle and the aggregates is 1.0 μm or more and 50.0 μm or less. 
     
     
         8 . The phosphor according to  claim 1 , containing a primary particle with particle size of 20 m or less and aggregates in which the primary particle agglutinates, wherein an average particle size (D50) of the powdery phosphor containing the primary particle and the aggregates is 1.0 μm or more and 20.0 μm or less. 
     
     
         9 . A phosphor mixture, comprising:
 the phosphor according to  claim 1 ;   more than one kind of blue phosphors having the emission spectrum with the maximum peak in the wavelength range from 420 nm to 500 nm, when excited by said excitation light in the wavelength range from 300 nm to 500 nm; and/or more than one kind of red phosphors having the emission spectrum with the maximum peak in the wavelength range from 590 nm to 680 nm, when excited by said excitation light in the wavelength range from 300 nm to 500 nm.   
     
     
         10 . A phosphor mixture, comprising:
 the phosphor according to  claim 1 ;   more than one kind of blue phosphors having the emission spectrum in the wavelength range from 420 nm to 500 nm, when excited by said excitation light in the wavelength range from 300 nm to 420 nm; and   more than one kind of red phosphor having the emission spectrum with the maximum peak in the wavelength range from 590 nm to 680 nm, when excited by said excitation light in the wavelength range from 300 nm to 420 nm.   
     
     
         11 . The phosphor mixture according to  claim 9 , wherein when an emission intensity of each phosphor constituting a mixture at a temperature of 25° C. when this phosphor is excited by a prescribed excitation light in the wavelength range from 300 nm to 500 nm is defined as P25, and the emission intensity at the temperature of 200° C. when this phosphor is irradiated with said prescribed excitation light is defined as P200, the relation of P25 and P200 is given satisfying (P25−P200)/P25×100 30. 
     
     
         12 . The phosphor mixture according to  claim 10 , wherein when an emission intensity of each phosphor constituting a mixture at a temperature of 25° C. when this phosphor is excited by a prescribed excitation light in the wavelength range from 300 nm to 500 nm is defined as P25, and the emission intensity at the temperature of 200° C. when this phosphor is irradiated with said prescribed excitation light is defined as P200, the relation of P25 and P200 is given satisfying (P25−P200)/P25×100 30. 
     
     
         13 . The phosphor mixture according to  claim 9 , wherein in the emission spectrum under excitation of the excitation light in the wavelength range from 300 nm to 420 nm, a correlated color temperature is in a range from 7000K to 2500K, with three or more emission peaks in the wavelength range from 420 nm to 750 nm and with a continuous spectrum without being interrupted in the wavelength range from 420 nm to 750 nm. 
     
     
         14 . The phosphor mixture according to  claim 9 , wherein the phosphor mixture is composed of a phosphor having an average particle size (D50) of 1 μm or more and 50 μm or less. 
     
     
         15 . A light emission device, comprising the phosphor according to  claim 1  and a light emission part for emitting light of a first wavelength, wherein the light of a different wavelength from the first wavelength is emitted from the phosphor, by using a part or an entire part of the light of the first wavelength as an excitation light. 
     
     
         16 . The light emission device, comprising the phosphor mixture according to  claim 9  and the light emission part for emitting light of the first wavelength, wherein the light of the different wavelength from the first wavelength is emitted from the phosphor, by using a part or an entire part of the light of the first wavelength as an excitation light. 
     
     
         17 . A light emission device according to  claim 15 , wherein the first wavelength is the wavelength of 350 nm to 500 nm. 
     
     
         18 . The light emission device according to  claim 15 , wherein the correlated color temperature of the light emission device is in a range from 10000K to 2000K. 
     
     
         19 . The light emission device according to  claim 15 , wherein an average color rendering index Ra of the light emission device is 80 or more. 
     
     
         20 . The light emission device according to  claim 15 , wherein the light emission part is a light emitting diode (LED).