(oxy) nitride phosphor, white light-emitting device including the (oxy) nitride phosphor, method of preparing phosphor, and nitride phosphor prepared by the method

Abstract

Provided is an (oxy)nitride phosphor, which is a compound represented by Formula 1 below: {M( 1-x) Eu x } a Si b O c N d   <Formula 1> wherein, M is an alkaline earth metal; and 0<x<1, 1.8<a<2.2, 4.5<b<5.5, 0≦c<8, 0<d≦8, and 0<c+d≦8. The (oxy)nitride phosphor produces red light suitable for use in UV-LED and blue-LED type white light-emitting devices and achieves good efficiency.

1 . An oxynitride phosphor comprising a compound represented by:
   {M (1-x) Eu x } a Si b O c N d      
       wherein, M is an alkaline earth metal; and 0<x<1, 1.8<a<2.2, 4.5<b<5.5, 0<c<8, 0<d≦8, and 0<c+d≦8. 
     
     
         2 . The oxynitride phosphor of  claim 1 , wherein M is Ba, Sr, or Ca. 
     
     
         3 . The oxynitride phosphor of  claim 1 , wherein the compound is {Sr (1-x) Eu x } a Si b O c N d  where 0<x≦0.1, 1.8<a<2.2, 4.5<b<5.5, 0<c<8, 0<d8. 
     
     
         4 . A white light-emitting device comprising:
 the oxynitride phosphor of  claim 1 ; and   an excitation source for exciting the oxynitride phosphor to emit white light.   
     
     
         5 . The white light-emitting device of  claim 4 , wherein the excitation source is an ultraviolet emitting diode (UV-LED) or a blue light-emitting diode (LED). 
     
     
         6 . The white light-emitting device of  claim 4 , further comprising at least one phosphor selected from the group consisting of a blue phosphor and a green phosphor. 
     
     
         7 . The white light-emitting device of  claim 4 , wherein the emission peak wavelength of the oxynitride phosphor is about 610 to about 650 nm, the emission peak wavelength of the blue phosphor is about 440 to about 460 nm, and the emission peak wavelength of the green phosphor is about 510 to about 560 nm.