Phosphor, light-emitting device using same, image display and illuminating device

Abstract

The present invention relates to a phosphor represented by the following general formula (I), comprising: a composite oxide containing a divalent and trivalent metal elements as a host crystal; and at least Ce as an activator element in said host crystal, wherein the phosphor has a maximum emission peak in a wavelength range of from 485 nm to 555 nm in the emission spectrum at room temperature: M 1 a M 2 b M 3 c O d   (I) wherein M 1 represents an activator element containing at least Ce; M 2 represents a divalent metal element; M 3 represents a trivalent metal element; a is a number within a range of 0.0001≦ a ≦0.2; b is a number within a range of 0.8≦b≦1.2; c is a number within a range of 1.6≦c≦2.4; and d is a number within a range of 3.2≦d≦4.8. Further, a light emitting device comprising said phosphor and a display and a lighting system having said light emitting device as a light source are disclosed. In accordance with the present invention, a phosphor which can be easily produced and can provide a light emitting device having a high color rendering, a light emitting device comprising the phosphor, and a display and a lighting system comprising the light emitting device as a light source can be provided.

1 - 13 . (canceled) 
   
   
       14 : A phosphor represented by general formula (I), which comprises a composite oxide containing divalent and trivalent metal elements, as a host crystal, and at least Ce as an activator element in said host crystal, wherein said phosphor has a maximum emission peak in a wavelength range of from 485 mm to 555 nm in the emission spectrum at room temperature:
   M 1   a M 2   b M 3   c O d   (I)   
     wherein M 1  represents an activator element containing at least Ce; M 2  represents a divalent metal element; M 3  represents a trivalent metal element; a is a number within a range of 0.0001≦a≦0.2; b is a number within a range of 0.8≦b≦1.2; c is a number within a range of 1.6≦c≦2.4; and d is a number with in a range of 3.2≦d≦4.8. 
   
   
       15 : The phosphor as described in  claim 14  wherein said activator element M 1  in general formula (I) contains at least Ce and at least one element selected from the group consisting of Cr, Mn, Fe, Co, Ni, Cu, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb. 
   
   
       16 : The phosphor as described in  claim 14 , wherein said divalent metal element M 2  in general formula (I) is at least one metal element selected from the group consisting of Mg, Ca, Zn, Sr, Cd and Ba. 
   
   
       17 : The phosphor as described in  claim 14 , wherein said trivalent metal element M 3  in general formula (I) is at least one metal element selected from the group consisting of Al, Sc, Ca, Y, In, La, Cd and Lu. 
   
   
       18 : The phosphor as described in  claim 14 , which comprises at least Sc as trivalent metal element M 3  in general formula (I). 
   
   
       19 : The phosphor as described in  claim 18 , wherein 50 mol % or more of said trivalent metal elements M 3  is Sc. 
   
   
       20 : The phosphor as described in  claim 14 , wherein said host crystal of said phosphor is a crystal represented by the composition formula M 2 M 3   2 O 4 , in which M 2  represents a divalent metal element and M 3  represents a trivalent metal element. 
   
   
       21 : The phosphor as described in  claim 14 , wherein said host crystal of said phosphor has any of space groups Pnma, Fd3(−)m, P2 1 /n, P2 1 , P6 3  or P2 1 /c. 
   
   
       22 : The phosphor as described in  claim 14 , which has a maximum emission peak in a wavelength range of from 500 nm to 535 nm in the emission spectrum at room temperature. 
   
   
       23 : A light emitting device comprising a phosphor which is a wavelength conversion material, and a semiconductor light emitting device which emits light in a wavelength range of from ultraviolet to visible light, wherein said light emitting device contains at least a phosphor described in  claim 14  as said phosphor. 
   
   
       24 . An electroluminescence light emitting device comprising a phosphor described in  claim 14 . 
   
   
       25 : A display comprising a light emitting device described in  claim 23  as a light source. 
   
   
       26 : A lighting system comprising a light emitting device described in  claim 23  as a light source. 
   
   
       27 : A display comprising a light emitting device described in  claim 24  as a light source. 
   
   
       28 : A lighting system comprising a light emitting device described in  claim 24  as a light source.