Phosphor, method for producing a phosphor and use of a phosphor
AssigneeOSRAM OLED GmbH
InventorsDaniel Bichler, Christian Koch, Johanna Strube-Knyrim
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Abstract
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.
Claims9
Phosphor of the formula AE16−xCexSi17-zAlzN32+y−zO2−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.
Method for producing a phosphor of the formula AE16−xCexSi17-zA1zN32+y−zO2−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, Si3N4, CeO2, SiO2 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.
Dependencies are inferred from the claim text.