Phosphor, method for producing a phosphor and use of a phosphor
The invention relates to a red-emitting luminescent material of the formula AE16−xCexSi17−zAlzN32+y−zO2−y+z wherein AE=Mg, Ca, Sr and/or Ba, 0<x≤2, 0≤y<5, 0≤z≤3 and y+z<2.
1. Phosphor of the formula AE 16−x Ce x Si 17-z Al z N 32+y−z O 2−y+z with AE=Mg, Ca, Sr and/or Ba, 0<x≤2, 0≤y<5, 0≤z≤3 and y+z<8, wherein the phosphor has a cubic crystal system with the space group F 4 3m.
2. Phosphor according to claim 1 , wherein the lattice constant a is at a=14.7−15.1 Å.
3. Phosphor according to claim 1 , wherein 0.0016<x≤1.6.
4. Phosphor according to claim 1 , wherein z=0 and y=x.
5. Phosphor according to claim 1 , which is configured to emit radiation in the red spectral range of the electromagnetic spectrum.
6. Phosphor according to claim 1 , which has an emission maximum in the range from 630 nm to 680 nm.
7. Method for producing a phosphor of the formula AE 16−x Ce x Si 17-z A1 z N 32+y−z O 2−y+z , with AE=Mg, Ca, Sr and/or Ba, 0<x≤2, 0≤y<5, 0≤z≤3 and y+z<8, wherein the phosphor is configured to emit radiation in the red spectral range of the electromagnetic spectrum, comprising the method steps
A) Mixing of the starting materials comprising an Mg, Ba, Sr and/or Ca nitride, Si 3 N 4 , CeO 2 , SiO 2 and/or an Mg, Ba, Sr, Al and/or Ca oxide, wherein the proportion of oxygen in the starting materials is 2 mol % to 20 mol % in relation to the total quantity of nitrogen and oxygen in the starting materials,
B) Heating of the mixture obtained in A) to a temperature over 1200° C.,
C) Annealing of the mixture at a temperature over 1200° C. for at least 4 hours,
D) Cooling of the mixture to room temperature.
8. Method according to claim 7 , wherein the method steps A) to D) are executed in a nitrogen atmosphere.
9. Method according to claim 7 , wherein the starting materials in method step A) comprise AlN.