Phosphor, light-emitting device, lighting device, image display device, and vehicle display lamp

By controlling the boron content in the phosphor and optimizing the element ratio, the problem of reduced luminescence characteristics caused by boron incorporation was solved, and the effects of good luminescence peak wavelength, narrow spectral half-value width, and high luminescence intensity were achieved, thereby improving the performance of the light-emitting device.

CN120659860AActive Publication Date: 2025-09-16MITSUBISHI CHEM CORP +1
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Patent Information

Application Number
CN202380093319.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-02-06
Filing Date
2023-12-27
Publication Date
2025-09-16
Estimated Expiration
2043-12-27

AI Technical Summary

Technical Problem

Existing phosphors have the problem of boron incorporation leading to reduced luminescence properties, and existing red phosphors have a wide spectral half-value width and poor conversion efficiency.

Method used

A crystalline phosphor with a specific composition is used, the boron content is controlled below the Log10(b) value of 3.5, and the element ratios of MA, MB, MC, D, X and Re are optimized to ensure a good luminescence peak wavelength, a narrow spectral half-value width and high luminescence intensity.

Benefits of technology

The invention provides a phosphor with good luminescence peak wavelength, narrow spectral half-value width and high luminescence intensity, thereby improving the color rendering, color reproducibility and conversion efficiency of the light-emitting device.

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Abstract

The present invention addresses the problem of providing a phosphor having a good emission peak wavelength, a narrow spectral half-value width, and a high emission intensity, and providing a light-emitting device, an illumination device, an image display device, and / or a vehicle display lamp having good color rendering, color reproducibility, and / or conversion efficiency. The present invention pertains to: a phosphor which contains a crystal phase having a composition represented by a specific formula and in which the value of Log10 (b) is 3.5 or less when the content of B (boron) is set as b (mass ppm); and a light-emitting device which is provided with the phosphor as a second light-emitting body.
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Claims

1. A phosphor comprising a crystal phase having a composition represented by the following formula [1], wherein, when the content of B, i.e., boron, is b and the unit is mass ppm, Log 10 The value of (b) is 3.5 or less, Re x MA a MB b MC c D d X e [1] In the above formula [1], MA contains one or more elements selected from the group consisting of Ca, Sr, Ba, Na, K, Y, Gd and La. MB contains one or more elements selected from the group consisting of Li, Mg, and Zn. MC contains one or more elements selected from the group consisting of Al, Si, Ga, In and Sc, D is one or more elements selected from the group consisting of N, i.e., nitrogen, and O, i.e., oxygen. X contains one or more elements selected from the group consisting of F, Cl, Br and I, Re contains one or more elements selected from the group consisting of Eu, Ce, Pr, Tb and Dy, a, b, c, d, e, and x satisfy the following formulas respectively: 0.7≤a≤1.3 0.9≤b≤1.3 c＝3.0 3.2≤d≤4.8 0.0≤e≤0.2 0.0<x≤0.2。 2. A phosphor comprising a crystal phase having a composition represented by the following formula [2], wherein, when the content of B, i.e., boron, is b and the unit is mass ppm, Log 10 The value of (b) is 3.5 or less, Re x MA a MB b (Al 1-y MC' y ) c D d X e [2] In the above formula [2], MA contains one or more elements selected from the group consisting of Ca, Sr, Ba, Na, K, Y, Gd and La. MB contains one or more elements selected from the group consisting of Li, Mg, and Zn. MC' contains one or more elements selected from the group consisting of Si, Ga, In and Sc, D is one or more elements selected from the group consisting of N, i.e., nitrogen, and O, i.e., oxygen. X contains one or more elements selected from the group consisting of F, Cl, Br and I, Re contains one or more elements selected from the group consisting of Eu, Ce, Pr, Tb and Dy, a, b, c, d, e, x, and y satisfy the following formulas respectively: 0.7≤a≤1.3 0.9≤b≤1.3 c＝3.0 3.2≤d≤4.8 0.0≤e≤0.2 0.0<x≤0.2 0.0<y≤1.0。 3. The phosphor according to claim 1 or 2, wherein the content of B, i.e., boron, is defined as b and the unit is mass ppm. Log 10 The value of (b) is 3.0 or less. 4 . The phosphor according to claim 1 , wherein in the formula [1] or [2], 80 mol % or more of MA is one or more elements selected from the group consisting of Ca, Sr, and Ba. 5 . The phosphor according to claim 1 , wherein in the formula [1] or [2], 80 mol % or more of MB is Li. 6 . The phosphor according to claim 1 , wherein in the formula [1], 80 mol % or more of MC is composed of one or more elements selected from the group consisting of Al and Ga. 7 . The phosphor according to claim 1 , wherein in the formula [1], 80 mol % or more of MC is Al. 8 . The phosphor according to claim 2 , wherein in the formula [2], 80 mol % or more of MC′ is Ga. 9 . The phosphor according to claim 1 , wherein in the formula [1] or [2], 80 mol % or more of Re is Eu. 10 . The phosphor according to claim 1 , wherein the space group of the crystal phase having the composition represented by the formula [1] or [2] is P-1. The phosphor according to claim 1 or 2, having a light emission peak wavelength in a range of 620 nm to 660 nm in a light emission spectrum. 12 . The phosphor according to claim 1 , wherein the full width at half maximum (FWHM) in the emission spectrum is 70 nm or less. 13 . A light-emitting device comprising a first light-emitting body and a second light-emitting body, wherein the second light-emitting body includes one or more phosphors that emit visible light when irradiated with light from the first light-emitting body, and the second light-emitting body includes the phosphor according to claim 1 or 2. The light-emitting device according to claim 13 , wherein the second light-emitting body further comprises a yellow phosphor and / or a green phosphor. 15 . The light-emitting device according to claim 14 , wherein the yellow phosphor and / or the green phosphor comprises at least one of a garnet-based phosphor, a silicate-based phosphor, a nitride phosphor, and a nitride oxide phosphor.

16. A lighting device comprising the light-emitting device according to claim 13 as a light source.

17. An image display device comprising the light-emitting device according to claim 13 as a light source.

18. A vehicle indicator lamp comprising the light emitting device according to claim 13 as a light source.

Citation Information

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