Phosphor, method of producing same, and light-emitting device
AssigneePanasonic Corporation
InventorsKOJIRO OKUYAMA, YOSHIHISA NAGASAKI, TAKASHI OHBAYASHI
Life of this patent
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Abstract
A phosphor includes, as a main component, a compound represented by a general formula (3-a)YO3/2.aCeO3/2.(5-b)AlO3/2.bGaO3/2.cKO1/2.dPO5/2, where a, b, c and d satisfy 0.12≦a≦0.18, 1.50≦b≦3.00, 0.01≦c≦0.08, and 0.01≦d≦0.08.
Claims13
A phosphor including, as a main component, a compound represented by a general formula (3-a)YO3/2.aCeO3/2.(5-b)AlO3/2.bGaO3/2.cKO1/2.dPO5/2, where a, b, c and d satisfy 0.12≦a≦0.18, 1.50 b≦3.00, 0.01≦c≦0.08, and 0.01≦d≦0.08.
A light-emitting device comprising:
- a phosphor including, as a main component, a compound represented by a general formula (3-a)YO3/2.aCeO3/2.(5-b)AlO3/2.bGaO3/2.cKO1/2.dPO5/2, where a, b, c and d satisfy 0.12≦a≦0.18, 1.50 b≦3.00, 0.01≦c≦0.08, and 0.01≦d≦0.08;
- and
- an excitation light source which emits first light having a peak wavelength in a range of 380 to 420 nm,
- wherein the phosphor absorbs part of the first light from the excitation light source to emit second light having a longer wavelength than the first light.
A method for producing a phosphor, the phosphor including, as a main component, a compound represented by a general formula (3-a)YO3/2.aCeO3/2.(5-b)AlO3/2.bGaO3/2.cKO1/2.dPO5/2, where a, b, c and d satisfy 0.12≦a≦0.18, 1.50≦b≦3.00, 0.01≦c≦0.08, and 0.01≦d≦0.08, the method comprising:
- preparing a mixture which includes starting materials for the phosphor;
- and
- firing the mixture in an atmosphere with an oxygen partial pressure in a range of 10−6 to 10−3 atm.
Dependencies are inferred from the claim text.