Luminescent material

Abstract

A luminescent material is provided, which includes a material formed of a single composition containing the main crystal phase and an activator which causes light emission. The material exhibits a narrowband light emission spectrum in a wavelength ranging from 540 nm to 550 nm and a broadband light emission spectrum in a wavelength ranging from 500 nm to 600 nm when the material is excited with light having the main light emission peak having a wavelength ranging from 370 nm to 460 nm.

1 . The method for manufacturing the luminescent material comprising a material formed of a single composition containing the main crystal phase and an activator which causes light emission, the material exhibiting a narrowband light emission spectrum in a wavelength ranging from 540 nm to 550 nm and a broadband light emission spectrum in a wavelength ranging from 500 nm to 600 nm when the material being excited with light having the main light emission peak having a wavelength ranging from 370 nm to 460 nm, comprising:
 heating a raw material in a reducing atmosphere constituted by N 2 /H 2  or Ar/H 2  to obtain a primary sintered product;   pulverizing the primary sintered product to obtain a pulverized primary sintered product;   housing the pulverized primary sintered product into a container;   arranging the container housing the pulverized primary sintered product to a furnace;   substituting an atmosphere in the furnace with an inert gas; and   heating the pulverized primary sintered product in the reducing atmosphere constituted by N 2 /H 2  or Ar/H 2  containing hydrogen at a concentration of 5% or more and less than 100% to obtain a secondary sintered product.   
   
   
       2 . A method for manufacturing a luminescent material comprising a compound having composition represented by following general formula (A)
   (Sr a1 ,Ba b1 ,Ca c1 ,Tb v1 ,Eu w1 ) 2 SiO 4   (A)   wherein, a1, b1, c1, v1, and w1 satisfy following relationships:
     a 1+ b 1+ c 1+ v 1+ w 1=1  (1) 
   0 ≦a 1/(1 −v 1− w 1)≦1  (2) 
   0 ≦b 1/(1 −v 1− w 1)≦1  (3) 
   0 ≦c 1/(1 −v 1− w 1)≦1  (4) 
   0<v1≦0.15  (5) 
   0<w1≦0.05  (6) 
   heating a raw material in a reducing atmosphere constituted by N 2 /H 2  or Ar/H 2  to obtain a primary sintered product;   pulverizing the primary sintered product to obtain a pulverized primary sintered product;   housing the pulverized primary sintered product into a container;   arranging the container housing the pulverized primary sintered product to a furnace;   substituting an atmosphere in the furnace with an inert gas; and   heating the pulverized primary sintered product in the reducing atmosphere constituted by N 2 /H 2  or Ar/H 2  containing hydrogen at a concentration of 5% or more and less than 100% to obtain a secondary sintered product.   
   
   
       3 . A method for manufacturing a luminescent material comprising a compound having a composition represented by the following general formula (B)
   (Sr a2 ,Ba b2 ,Ca c2 ,Tb v2 ,Eu w2 ,M v2 ) 2 SiO 4   (B)   wherein M is at least one selected from the group consisting of Li, Na, K, Rb, and Cs, and a2, b2, c2, v2, and w2 satisfy following relationships:
     a 2 +b 2 +c 2+2 v 2 +w 2=1  (7) 
   0 ≦a 2/(1−2 v 2 −w 2)≦1  (8) 
   0 ≦b 2/(1−2 v 2 −w 2)≦1  (9) 
   0 ≦c 2/(1−2 v 2 −w 2)≦1  (10) 
   0<v2≦0.15  (11) 
   0<w2≦0.05  (12) 
   comprising:   heating a raw material in a reducing atmosphere constituted by N 2 /H 2  or Ar/H 2  to obtain a primary sintered product;   pulverizing the primary sintered product to obtain a pulverized primary sintered product;   housing the pulverized primary sintered product into a container;   arranging the container housing the pulverized primary sintered product to a furnace;   substituting an atmosphere in the furnace with an inert gas; and   heating the pulverized primary sintered product in the reducing atmosphere constituted by N 2 /H 2  or Ar/H 2  containing hydrogen at a concentration of 5% or more and less than 100% to obtain a secondary sintered product.