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≥l>0.125 v.
1. A phosphor having the general molecular formula:
(MA) a (MB) b (TA) c (TB) f (TC) g (TD) h (XB) l (XC) m :E,
wherein
MA is selected from a group of monovalent metals consisting of Li, Na, K, Rb, Cs, Cu, Ag and combinations thereof,
MB is selected from a group of divalent metals consisting of Mg, Ca, Sr, Ba, Zn, Mn, Eu, Yb, Ni, Fe, Co and combinations thereof,
TA is selected from a group of monovalent metals consisting of Li, Na, Cu, Ag and combinations thereof,
TB is selected from a group of divalent metals consisting of Mg, Zn, Mn, Eu, Yb, Ni and combinations thereof,
TC is selected from a group of trivalent metals consisting of B, Al, Ga, In, Y, Fe, Cr, Sc, rare earths and combinations thereof,
TD is selected from a group of tetravalent metals consisting of Si, Ge, Sn, Mn, Ti, Zr, Hf, Ce and combinations thereof,
XB is selected from a group of elements consisting of O, S and combinations thereof,
XC═N
E=Eu, Ce, Yb and/or Mn,
a+b=1
e+f+g+h=4
l+m=4
a+2b+e+2f+3g+4h−2l−3m=0 and
0≤m<1.75.
2. The phosphor as claimed in claim 1 , wherein
MA is selected from a group of monovalent metals consisting of Li, Na, K, Rb, Cs and combinations thereof,
MB is selected from a group of divalent metals consisting of Mg, Ca, Sr, Ba, Eu and combinations thereof,
TC is selected from a group of trivalent metals consisting of B, Al, Ga, In and combinations thereof,
TD is selected from a group of tetravalent metals consisting of Si, Ge, Sn, Mn, Ti and combinations thereof and
XB═O.
3. The phosphor as claimed in claim 1 , wherein f=g=0.
4. The phosphor as claimed in claim 1 , which has a crystal structure in which TA, TB, TC and/or TD are surrounded by XB, and/or XC 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 and/or MB are/is arranged in the cavities or channels.
5. The phosphor as claimed in claim 1 , which has the general molecular formula (MA) a (MB) b (TA) c (TD) h (XB) l (XC) m :E, wherein
MA is selected from a group of monovalent metals consisting of Li, Na, K, Rb, Cs, Cu, Ag and combinations thereof,
MB is selected from a group of divalent metals consisting of Mg, Ca, Sr, Ba, Zn, Mn, Eu, Yb, Ni, Fe, Co and combinations thereof,
TA is selected from a group of monovalent metals consisting of Li, Na, Cu, Ag and combinations thereof,
TD is selected from a group of tetravalent metals consisting of Si, Ge, Sn, Mn, Ti, Zr, Hf, Ce and combinations thereof,
XB is selected from a group of elements consisting of O, S and combinations thereof,
E=Eu, Ce, Yb and/or Mn,
XC═N,
a+b=1,
e+h=4,
l+m=4,
a+2b+e+4h−2l−3m=0
and m<1.75 or 1>2.25.
6. The phosphor as claimed in claim 5 , wherein
MA is selected from a group of monovalent metals consisting of Li, Na, K, Rb, Cs and combinations thereof,
MB is selected from a group of divalent metals consisting of Mn, Eu, Yb and combinations thereof,
TA is selected from a group of monovalent metals consisting of Li, Na and combinations thereof,
TD is selected from a group of tetravalent metals consisting of Si, Ge, Sn, Mn, Ti, and combinations thereof,
and
XB═O.
7. The phosphor as claimed in claim 1 , which has the general molecular formula (MA) a (MB) b (TA) c (TC) g (TD) h (XB) l (XC) m :E, wherein—MA is selected from a group of monovalent metals consisting of Li, Na, K, Rb, Cs, Cu, Ag and combinations thereof,
MB is selected from a group of divalent metals consisting of Mg, Ca, Sr, Ba, Eu and combinations thereof,
TA is selected from a group of monovalent metals consisting of Li, Na, Cu, Ag and combinations thereof,
TC is selected from a group of trivalent metals consisting of B, Al, Ga and combinations thereof,
TD is selected from a group of tetravalent metals consisting of Si, Ge and combinations thereof,
E=Eu, Ce, Yb and/or Mn
XB═O,
XC═N
a+b=1
e+g+h=4
l+m=4
a+2b+e+3g+4h−2l−3m=0 and m<1.75 or 1>2.25.
8. The phosphor as claimed in claim 7 , wherein
MA is selected from a group of monovalent metals consisting of Li, Na, K and combinations thereof,
MB is selected from a group of divalent metals consisting of Mg, Ca, Sr, Ba, Eu and combinations thereof,
E=Eu, Ce, Yb and/or Mn
TA=Li,
TC=Al,
TD=Si,
XB═0, and
XC═N.
9. 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 T 1 of between 500 and 1400° C.,
C) annealing the mixture at a temperature T 1 of 500 to 1400° C. for 0.5 minute to ten hours.
10. The phosphor as claimed in claim 1 , wherein the phosphor emits a secondary radiation in the blue to blue-green spectral range of the electromagnetic spectrum.
11. The phosphor as claimed in claim 1 , wherein the phosphor emits a secondary radiation in the blue to green-yellow spectral range of the electromagnetic spectrum.
12. The phosphor as claimed in claim 1 , wherein MB is selected from a group of divalent metals comprising Mn, Eu, Yb, and combinations thereof.
13. The phosphor as claimed in claim 1 , wherein MB is Eu, Eu combined with Mn, or Eu combined with Yb.