Phosphors

A novel red phosphor with a specific crystal phase composition addresses the limitations of existing phosphors by offering improved emission efficiency and color rendering, enhancing LED performance in lighting and display applications.

JP7873463B2Active Publication Date: 2026-06-12NAT INST FOR MATERIALS SCI
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Patent Information

Application Number
JP2021166903
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-10-11
Publication Date
2026-06-12
Estimated Expiration
2041-10-11

AI Technical Summary

Technical Problem

Existing red phosphors used in white LEDs have issues such as low red sensitivity, decreased lumen equivalent, and poor color rendering properties due to their long emission peak wavelength and wide half-value width, necessitating a more environmentally friendly and efficient alternative.

Method used

A novel red phosphor with a specific crystal phase composition, represented by Re x (Sr 1-y MA y ) a MB b MC c N d O e X f , where MA, MB, MC, and X are specific elements, and the phosphor exhibits a peak wavelength between 620 nm and 645 nm with a full width at half maximum (FWHM) of 70 nm or less, enhancing emission efficiency and color rendering.

Benefits of technology

The novel red phosphor provides improved emission color, increased red sensitivity, and enhanced color rendering properties, leading to better luminescence efficiency and color reproduction in lighting and display devices.

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Patent Text Reader

Abstract

To provide a novel red phosphor demonstrating excellent light emitting properties.SOLUTION: The present invention provides a phosphor comprising a crystal phase of a composition represented by formula (1): Rex(Sr1-yMAy)aMBbMCcNdOeXf (MA represents one or more elements that are selected from the group consisting of Ca, Ba, Na, K, Y, Gd and La; MB represents one or more elements that are selected from the group consisting of Li, Mg and Zn; MC represents one or more elements that are selected from the group consisting of Al, Si, Ga, In and Sc; X represents one or more elements that are selected from the group consisting of F, Cl, Br and I; Re represents one or more elements that are selected from the group consisting of Eu, Ce, Pr, Tb and Dy; and a, b, c, d, e, f, x and y respectively satisfy 0.8≤a≤1.2, 1.4≤b≤2.6, 1.4≤c≤2.6, 1.1≤d≤2.9, 1.1≤e≤2.9, 0.0≤f≤0.1, 0.0<x≤0.2, and 0.0<y≤0.7).SELECTED DRAWING: Figure 1
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Citation Information

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