Phosphor compositions and methods of making the same

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United States of America Patent

PATENT NO 9567518
APP PUB NO 20150008818A1
SERIAL NO

14496793

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Abstract

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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.

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Patent Owner(s)

  • NITTO DENKO CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Miyagawa, Hiroaki Oceanside, US 51 595
Shih, James Chienchung Artesia, US 2 16
Zhang, Bin San Diego, US 639 5289

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