Multiple rare-earth co-activated long-afterglow luminescent material

Abstract

The present invention relates to a multiple rare earth co-activated long-afterglow luminescent material having its general chemical composition depicted by a formula aMO.bAl 2 O 3 .cSiO 2 .dGa 2 O 3 :xEu.yB.zN, wherein a, b, c, d, x, y, and z are coefficients with the ranges of 0.5≦a≦2, 0.5≦b≦3, 0.001≦c≦1, 0.0001≦d≦1, 0.0001≦x≦1, 0.0001≦y≦1, 0.0001≦z≦1, M is Ca or Sr, N is Dy or Nd, wherein Sr (or Ca), Al, Si, Ga are main matrix elements and Eu, B, Dy (or Nd) elements are activators. The long-afterglow luminescent material according to the present invention has advantage of a longer persistence period and a water resistance greatly superior to known rare-earth activated aluminate long-afterglow luminescent materials.

1 . A multiple rare-earth co-activated long-afterglow luminescent material having a chemical composition depicted by the formula
     a MO. b Al 2 O 3   .c SiO 2   .d Ga 2 O 3   :x Eu. y B. z N   wherein a, b, c, d, x, y and z are coefficients with the ranges of 0.5≦a≦2, 0.5≦b≦3, 0.001≦c≦1, 0.0001≦d≦1, 0.0001≦x≦1, 0.0001≦y≦1, 0.0001≦z≦1; M is at least one of Ca, Sr elements and N is at least one of Dy, Nd elements.   
     
     
         2 . The multiple rare-earth co-activated long-afterglow luminescent material according to  claim 1 , wherein in the chemical composition 0.8≦a≦1.2, 0.8≦b≦2, 0.002≦c≦0.061, 0.005≦d≦0.5, 0.005≦x≦0.1, 0.02≦y≦0.5, and 0.005≦z≦0.05. 
     
     
         3 . The multiple rare-earth co-activated long-afterglow luminescent material according to  claim 2 , wherein in the chemical composition a=1, 1≦b≦2, 0.002≦c≦0.02, 0.005≦d≦0.0, 0.01≦x≦0.02, 0.05≦y≦0.3, 0.01≦z≦0.04. 
     
     
         4 . The multiple rare-earth co-activated long afterglow luminescent material according to  claim 1 , wherein the Sr or Ca elements, respectively, result from carbonates or oxides of Strontium or Calcium; Al results from oxides or hydrates of Aluminum; Si or Ga elements result from oxides of Silicon or Gallium; Eu, Dy, and Nd result from oxides or oxalates of Europium, Dysprosium or Neodymium; and B results from oxides of Boron or Boric acid. 
     
     
         5 . The multiple rare-earth co-activated long afterglow luminescent material according to  claim 2 , wherein the Sr or Ca elements, respectively, result from carbonates or oxides of Strontium or Calcium; Al results from oxides or hydrates of Aluminum; Si or Ga elements result from oxides of Silicon or Gallium; Eu, Dy, and Nd result from oxides or oxalates of Europium, Dysprosium or Neodymium; B results from oxides of Boron or Boric acid. 
     
     
         6 . The multiple rare-earth co-activated long afterglow luminescent material according to  claim 3 , wherein the Sr or Ca elements, respectively, result from carbonates or oxides of Strontium or Calcium; Al results from oxides or hydrates of Aluminum; Si or Ga elements result from oxides of Silicon or Gallium; Eu, Dy, and Nd result from oxides or oxalates of Europium, Dysprosium or Neodymium; B results from oxides of Boron or Boric acid. 
     
     
         7 . A method for manufacturing the multiple rare-earth co-activated long-afterglow luminescent material according to  claim 1 , the method comprising (1) mixing raw materials sufficiently according to a following molar ratio, and (2) sintering a resultant mixture for 2-6 hours under 1200˜1500° C. at a reductive atmosphere, whereby a resultant is obtained, wherein,
 MO:Al 2 O 3 :SiO 2 :Ga 2 O 3 :Eu:B:N=a:b:c:d:x:y:z; and 0.5≦a≦2, 0.5≦b≦3, 0.001≦c≦1, 0.0001≦d≦1, 0.0001≦x≦1, 0.0001≦y≦, 0.0001≦z≦1 are selected; M is Ca or Sr and N is Dy or Nd; sources of the said raw materials are: the Sr or Ca elements, respectively, result from carbonates or oxides of Strontium or Calcium; Al results from oxide or hydrate of Aluminum; Si or Ga elements, respectively, result from oxides of Silicon or Gallium; Eu, Dy, and/or Nd result from oxides or oxalates of europium, dysprosium or neodymium; B results from oxides of Boron or Boric acid.   
     
     
         8 . The method for manufacturing the multiple rare-earth co-activated long-afterglow luminescent material according to  claim 7 , wherein a=1, 1≦b≦2, 0.002≦c≦0.02, 0.005≦d≦0.01, 0.01≦x≦0.02, 0.05≦y≦0.3, 0.01≦z≦0.04 in a chemical composition ratio of each raw material are selected. 
     
     
         9 . The method for manufacturing the multiple rare-earth co-activated long afterglow luminescent material according to  claim 7 , wherein said reductive atmosphere is CO or H 2  gas. 
     
     
         10 . A use of said multiple rare-earth co-activated long-afterglow luminescent material according to  claim 1  as a direction identifier for subway passengers, traffic signs, bridge identifiers, scutellate signs, border lines, walking passages, lamp posts, tunnel marks, fire control and emergency escape signs, ship decks, dock signs, and oil well signs. 
     
     
         11 . A use of said multiple rare-earth co-activated long-afterglow luminescent material according to  claim 2  as a direction identifier for subway passengers, traffic signs, bridge identifiers, scutellate signs, border lines, walking passages, lamp posts, tunnel marks, fire control and emergency escape signs, ship decks, dock signs, and oil well signs. 
     
     
         12 . A use of said multiple rare-earth co-activated long-afterglow luminescent material according to  claim 3  for direction identifier for subway passengers, traffic signs, bridge identifiers, scutellate signs, border lines, walking passages, lamp posts, tunnel marks, fire control and emergency escape signs, ship decks, dock signs, and oil well signs. 
     
     
         13 . A use of said multiple rare-earth co-activated long afterglow luminescent material according to  claim 1  for dresses, aqueous inner and outer wall coatings, paints, and print inks. 
     
     
         14 . A use of said multiple rare-earth co-activated long afterglow luminescent material according to  claim 2  for dresses, aqueous inner and outer wall coatings, paints, and print inks. 
     
     
         15 . A use of said multiple rare-earth co-activated long afterglow luminescent material according to  claim 3  for dresses, aqueous inner and outer wall coatings, paints, and print inks.