Rare earth aluminum garnet-type inorganic oxide, phosphor and light-emitting device using same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsShozo OSHIO, Natsuki SATO
Life of this patent
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Abstract
An inorganic oxide of the present invention has a composition represented by General formula (1): M2LnX2(AlO4)3 (where M includes Ca, Ln includes Tb, and X includes at least either one of Zr and Hf). Then, a number of Tb atoms in General formula (1) is 0.1 or more to 1 or less. Moreover, a crystal structure of the inorganic oxide is a garnet structure. A phosphor made of this inorganic oxide is capable of being excited by short-wavelength visible light, and can radiate narrow-band green light.
Claims24
An inorganic oxide comprising:
- a composition represented by General formula:
- M2LnX2(AlO4)3 (1)
- where M includes Ca, Ln includes Tb, and X includes at least either one of Zr and Hf,
- wherein a number of Tb atoms in General formula (1) is 0.1 or more to 1 or less, and a crystal structure of the inorganic oxide is a garnet structure.
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A phosphor comprising:
- at least Ce3+ and Tb3+ as emission centers,
- wherein an excitation spectrum of the phosphor has a broad excitation band provided by absorption of Ce3+, and the excitation band has a peak within a range of 400 nm or more to less than 460 nm,
- an emission spectrum of the phosphor emits a green fluorescent component provided by Tb3+, and
- emission intensity of the emission spectrum at a wavelength of 520 nm is smaller than 30% of a maximum value of the emission spectrum.
A phosphor comprising:
- at least Ce3+, Tb3+ and Eu3+ as emission centers,
- wherein an excitation spectrum of the phosphor has a broad excitation band provided by absorption of Ce3+, and the excitation band has a peak within a range of 400 nm or more to less than 460 nm,
- an emission spectrum of the phosphor emits a green fluorescent component provided by Tb3+ and/or a red fluorescent component provided by Eu3+, and
- emission intensity of the emission spectrum at a wavelength of 520 nm is smaller than 30% of a maximum value of the emission spectrum.
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Dependencies are inferred from the claim text.