Oxynitride phosphor and a light emitting device
AssigneesFujikura Ltd., National Institute for Materials Science
InventorsKen Sakuma, Naoto Hirosaki
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Abstract
A preferred embodiment according to the present invention provides in one preferred mode an oxynitride phosphor especially suitable for a light emitting device such as but not limited to a white light emitting diode lamp and also such a light emitting device. The oxynitride phosphor in the embodiment is represented by a general formula Cax(Si,Al)12(O,N)16:Eu2+y, wherein a Ca composition of x is in a range of from 0.75 to 1.0 and a Eu composition of y is in a range of from 0.04 to 0.25, and wherein a main phase thereof has substantially an alpha SiAlON crystal structure.
Claims3
An oxynitride phosphor represented by a general formula CaxSi12−(m+n)Al(m+n)OnN16−n:Eu2+y;
- wherein a calcium composition of x is in a range of from 0.75 to 1.0 and a europium composition of y is in a range of from 0.04 to 0.0833,
- wherein an oxygen composition of n is greater than 0.81, and
- wherein a main phase thereof has substantially an alpha SiAlON crystal structure.
A light emitting device comprising:
- a semiconductor light source element, and
- a wavelength conversion material that converts a wavelength of light emitted from said semiconductor light source element,
- wherein the wavelength conversion material is represented by a general formula CaxSi12−(m+n)Al(m+n)OnN16−n:Eu2+y, in which a calcium composition of x is in a range of from 0.75to 1.0 and a europium composition of y is in a range of from 0.04 to 0.0833, in which the oxygen composition of n is greater than 0.81 and in which a main phase thereof has substantially an alpha SiAlON crystal structure.
Dependencies are inferred from the claim text.