Phosphor particle group and light emitting apparatus using the same
AssigneeSharp Kabushiki Kaisha
InventorsTetsuya HANAMOTO, Masatsugu Masuda, Kenji Terashima
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Abstract
Provided is a phosphor particle group of divalent europium-activated oxynitride green light emitting phosphor particles each of which is a β-type SiAlON substantially represented by a general formula: EuaSibAlcOdNe, where 0.005≦a≦0.4, b+c=12, d+e=16, wherein 60% or more of the phosphor particle group is composed of the phosphor particles in which a value obtained by dividing a longer particle diameter by a shorter particle diameter is greater than 1.0 and not greater than 3.0. A high-efficiency and stable light emitting apparatus using a β-type SiAlON, which includes a light converter using the phosphor particle group, and a phosphor particle group therefor are also provided.
Claims8
A phosphor particle group of divalent europium-activated oxynitride green light emitting phosphor particles each of which is a β-type SiAlON substantially represented by a general formula:
- EuaSibAlcOdNe, where 0.005≦a≦0.4, b+c=12, d+e=16, wherein a value obtained by dividing a longer particle diameter by a shorter particle diameter is greater than 1.0 and not greater than 3.0.
A light emitting apparatus comprising:
- a light emitting element of a gallium nitride-based semiconductor emitting primary light having a peak wavelength of 430-480 nm;
- and a light converter absorbing a part of said primary light to emit secondary light having a wavelength longer than a wavelength of said primary light,
- said light converter including a phosphor particle group of divalent europium-activated oxynitride green light emitting phosphors each of which is a β-type SiAlON substantially represented by a general formula:
- EuaSibAlcOdNe, where 0.005≦a≦0.4, b+c=12, d+e=16, wherein a value obtained by dividing a longer particle diameter by a shorter particle diameter is greater than 1.0 and not greater than 3.0.
The light emitting apparatus according to claim 5, wherein a median diameter of the phosphor particle group is in a range of 6-20 μm.
A phosphor particle of divalent europium-activated oxynitride green light emitting phosphor particle which is a β-type SiAlON substantially represented by a general formula:
- EuaSibAlcOdNe, where 0.005≦a≦0.4, b+c=12, d+e=16, wherein a value obtained by dividing a longer particle diameter by a shorter particle diameter is greater than 1.0 and not greater than 3.0.
A light emitting apparatus comprising:
- a light emitting element of a gallium nitride-based semiconductor emitting primary light having a peak wavelength of 430-480 nm;
- and a light converter absorbing a part of said primary light to emit secondary light having a wavelength longer than a wavelength of said primary light,
- said light converter including a phosphor particle of divalent europium-activated oxynitride green light emitting phosphor which is a β-type SiAlON substantially represented by a general formula:
- EuaSibAlcOdNe, where 0.005≦a≦0.4, b+c=12, d+e=16, wherein a value obtained by dividing a longer particle diameter by a shorter particle diameter is greater than 1.0 and not greater than 3.0.
Dependencies are inferred from the claim text.