Near-infrared phosphor, method for manufacturing a near-infrared phosphor, light-emitting element, and light-emitting device

JP7880300B2Active Publication Date: 2026-06-25MITSUI MINING & SMELTING CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
MITSUI MINING & SMELTING CO LTD
Filing Date
2023-01-20
Publication Date
2026-06-25

AI Technical Summary

Benefits of technology

【0017】 本発明によれば、波長350nm付近での反射率が高く、それにより波長800nm付近での近赤外領域での発光強度が高いとともに、発光ピーク波長の調整が容易なメタリン酸塩系化合物からなる近赤外蛍光体及びその製造方法が提供される。また本発明によれば、前記近赤外蛍光体を備えた発光素子及び発光装置が提供される。

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Abstract

To provide a phosphor composed of a metaphosphate compound with high reflectivity around a wavelength of 350 nm, which enhances the emission intensity in the near-infrared region around 800 nm, facilitating the adjustment of the emission peak wavelength, and a method for producing the same, and to also provide a light-emitting element and a light-emitting part each including the phosphor.SOLUTION: A near-infrared phosphor is primarily composed of a compound with a composition represented by formula: M1-y(PO3)3: Cry (where M is a trivalent metal ion containing at least one of Ga and Al, 0.09≤y≤0.20), and possesses a wavelength region with a reflectivity of 0.75 or more in a wavelength range of 320 nm or more and 380 nm or less.SELECTED DRAWING: Figure 8
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Claims

1. Formula: M １－ｙ (PO ３ ) ３ : Cr ｙ A near-infrared phosphor having a composition represented by (wherein M is a trivalent metal ion containing at least one of Ga and Al, and 0.09 ≤ y ≤ 0.20) as its main component, and having a wavelength range within the wavelength range of 320 nm to 380 nm in which the reflectance is 0.75 or higher.

2. Formula: Ga １－ｘ－ｙ Al ｘ (PO ３ ) ３ : Cr ｙ The near-infrared phosphor according to claim 1, comprising, as a main component, a compound having a composition represented by (where 0 ≦ x, x + y ≦ 1, and 0.09 ≦ y ≦ 0.20).

3. Formula: M １－ｙ (PO ３ ) ３ : Cr ｙ A method for producing a near-infrared phosphor having a wavelength range in which the reflectance is 0.75 or more within the wavelength range of 320 nm to 380 nm, comprising a compound having a composition represented by (wherein M is a trivalent metal ion containing at least one of Ga and Al, 0.09 ≤ y ≤ 0.20) as the main component, the method comprising the following steps: A precipitation process to obtain a chromium-containing precipitate from a chromium (Cr) raw material by a liquid-phase method. A mixing step of mixing the aforementioned precipitate, M raw material, and phosphorus (P) raw material to obtain a mixture, and Synthesis step: Reacting the mixture to synthesize the near-infrared phosphor. A method that includes this.

4. A light-emitting element comprising a near-infrared phosphor as described in claim 1 or 2 and an LED that emits light capable of exciting the near-infrared phosphor.

5. A light-emitting device comprising a light-emitting element as described in claim 4.