Phosphor and method for producing the phosphor
A phosphor is specified. The phosphor has the general molecular formula: (MA) a (MB) b (MC) c (MD) d (TA) e (TB) f (TC) g (TD) h (TE) i (TF) j (XA) k (XB) l (XC) m (XD) n :E. In this case, MA is selected from a group of monovalent metals, MB is selected from a group of divalent metals, MC is selected from a group of trivalent metals, MD is selected from a group of tetravalent metals, TA is selected from a group of monovalent metals, TB is selected from a group of divalent metals, TC is selected from a group of trivalent metals, TD is selected from a group of tetravalent metals, TE is selected from a group of pentavalent elements, TF is selected from a group of hexavalent elements, XA is selected from a group of elements which comprises halogens, XB is selected from a group of elements which comprises O, S and combinations thereof, -E=Eu, Ce, Yb and/or Mn, XC=N and XD=C. The following furthermore hold true: a+b+c+d=t; e+f+g+h+i+j=u; k+l+m+n=v; a+2b+3c+4d+e+2f+3g+4h+5i+6j−k−2l−3m−4n=w; 0.8≤t≤1; 3.5≤u≤4; 3.5≤v≤4; (−0.2)≤w≤0.2 and 0≤m<0.875 v and/or v≥1>0.125 v.
1. A phosphor having the general molecular formula
(MA) 1 (TA) 3 (TD) 1 (XB) 4 E,
herein
MA is selected from a group of monovalent metals which comprises Li, Na, K, Rb, Cs and combinations thereof,
TA=Li,
TD=Si,
XB=O and E is selected from a group which comprises Eu, Ce, Yb, Mn and combinations thereof.
2. The phosphor as claimed in claim 1 , wherein the phosphor has a crystal structure in which TA and TD are surrounded by XB and the resultant structural units are linked via common corners and edges to form a three-dimensional spatial network having cavities or channels and MA is arranged in the cavities or channels.
3. The phosphor as claimed in claim 1 , wherein the phosphor has the following general molecular formula:
(Na r K 1−r ) 1 (TA) 3 (TD) 1 (XB) 4 :E,
wherein 0≤r≤1.
4. The phosphor as claimed in claim 3 , wherein the phosphor crystallizes in the space group I4 1 /a, I4/m or P-1.
5. The phosphor as claimed in claim 3 , wherein 0.05<r≤0.2.
6. The phosphor as claimed in claim 3 , wherein 0.4<r≤1.
7. The phosphor as claimed in claim 1 , wherein the phosphor has the following general molecular formula: (Rb r′ Li 1−r′ ) 1 (TA) 3 (TD) 1 (XB) 4 :E, wherein 0≤r′≤1.
8. The phosphor as claimed in claim 7 , wherein 0.25≤r′≤0.75.
9. The phosphor as claimed in claim 1 , wherein the phosphor has the following general molecular formula: (K 1−r″−r′″ Na r″ Li r′″ ) 1 (TA) 3 (TD) 1 (XB) 4 :E, wherein 0<r″<0.5 and 0<r′″<0.5.
10. The phosphor as claimed in claim 9 , wherein the phosphor crystallizes in the space group I4/m or C2/m.
11. The phosphor as claimed in claim 1 , wherein the phosphor has the following general molecular formula: (Rb r* Na 1−r* ) 1 (TA) 3 (TD) 1 (XB) 4 :E, wherein 0<r* <1.
12. The phosphor as claimed in claim 11 , wherein the phosphor crystallizes in the space group I4/m or C2/m.
13. The phosphor as claimed in claim 1 , wherein the phosphor has the following general molecular formula: (Cs,Na,K,Li) 1 (TA) 3 (TD) 1 (XB) 4 :E.
14. The phosphor as claimed in claim 1 , wherein the phosphor has the following general molecular formula: (Cs,Na,Rb,Li) 1 (TA) 3 (TD) 1 (XB) 4 :E.
15. The phosphor as claimed in claim 1 , wherein the phosphor has the following general molecular formula: (Cs,Na,K) 1 (TA) 3 (TD) 1 (XB) 4 :E.
16. The phosphor as claimed in claim 1 , wherein the phosphor has the following general molecular formula: (Rb,Na,K) 1 (TA) 3 (TD) 1 (XB) 4 :E.
17. A method for producing a phosphor as claimed in claim 1 comprising the following method steps:
A) mixing starting materials of the phosphor,
B) heating the mixture obtained under A) to a temperature T1 of between 500 and 1400° C.,
C) annealing the mixture at a temperature T1 of 500 to 1400° C. for 0.5 minute to ten hours.