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US 9,309,460 B2Granted
Phosphor, method for producing same, and use of same
AssigneeDenka Company Limited
InventorsHideyuki Emoto, Hiroaki Toyoshima
Life of this patent
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AssigneeDenka Company Limited
InventorsHideyuki Emoto, Hiroaki Toyoshima
Estimating the term…
Provided are: a phosphor that has a crystal structure identical to a CaAlSiN3 crystal phase, which absorbs light of a light emitting element such as an LED and emits red light, as a host crystal and exhibits luminous efficiency more excellent than those of conventional phosphors; and a light emitting device which has high luminance and long service life by the use of this phosphor. A powder phosphor, which is represented by general formula Cax(Si,Al)2(N,O)3+y (wherein 0.75≦x≦0.92 and −0.2≦y≦0.2), and wherein some of Ca element is substituted by Eu element. This powder phosphor has an Si/Al ratio (molar ratio) of from 0.9 to 1.55 (inclusive), an Eu content of from 0.01 at % to 0.3 at % (inclusive), and an amount of intragranular solid-solved oxygen of from 0.4% by mass to 0.7% by mass (inclusive).
A powder phosphor represented by a general formula Cax(Si,Al)2(N,O)3+y, wherein 0.75≦x≦0.92 and −0.2≦y≦0.2, with some of Ca elements substituted with Eu elements, wherein the powder phosphor has a Si/AI ratio (molar ratio) of 0.9 or more and 1.55 or less, an Eu content of 0.01 at % or more and 0.3 at % or less, and an amount of solid solution oxygen in particle of 0.4 mass % or more and 0.7 mass % or less.
Dependencies are inferred from the claim text.