PHOSPHOR COMPOSITIONS AND METHODS OF MAKING THE SAME

摘要

Disclosed herein are emissive ceramic elements having low amounts of certain trace elements. Applicants have surprisingly found that a lower internal quantum efficiency (IQE) may be attributed to specific trace elements that, even at very low amounts (e.g., 50 ppm or less), can cause significant deleterious effects on IQE. In some embodiments, the emissive ceramic element includes a garnet host material and an amount of Ce dopant. The emissive ceramic element may, in some embodiments, have an amount of Na in the composition less than about 67 ppm, an amount of Mg in the composition less than about 23 ppm, or an amount of Fe in the composition less than about 21 ppm.

主权项

1. An emissive composition comprising:
a garnet host material; and an amount of Ce dopant effective to produce luminescence when the emissive composition is exposed to an ultraviolet or blue radiation, wherein at least one of (i) an amount of Na in the composition is less than about 67 ppm, (ii) an amount of Mg in the composition is less than about 23 ppm, or (iii) an amount of Fe in the composition is less than about 21 ppm.