Phosphor composition and method for producing the same, and light-emitting device using the same
AssigneePanasonic Corporation
InventorShozo Oshio
Life of this patent
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Abstract
A phosphor composition that contains a phosphor host having as a main component a composition represented by a composition formula: MAlSiN3, where “M” is Sr or Sr in combination with at least one element selected from the group consisting of Mg, Ca, Ba, and Zn, in which Sr is a main component. The phosphor composition is activated by replacing a part of the M in the phosphor host composition with Eu2+. This enables a light-emitting device emitting white light and satisfying both a high color rendering property and a high luminous flux to be provided.
Claims10
A phosphor composition comprising a phosphor host having as a main component a composition represented by a composition formula:
- MAlSiN3,
- wherein M in the composition formula is Sr or Sr in combination with at least one element selected from the group consisting of Mg, Ca, Ba, and Zn,
- a main component of the combination is Sr,
- the phosphor composition is obtained by replacing a part of the M by Eu2+, and a replacement amount is 0.1 atomic % to 30 atomic % with respect to the M, and
- the phosphor composition has an emission peak in a wavelength range of between 610 nm and 650 nm, and an internal quantum efficiency of the phosphor composition under excited light in a wavelength range of 440 nm to less than 500 nm is at least 70%.
Dependencies are inferred from the claim text.