OXIDE FLUORESCENT MATERIAL, LIGHT EMITTING DEVICE, AND METHOD FOR PRODUCING OXIDE FLUORESCENT MATERIAL

    公开(公告)号:US20240052240A1

    公开(公告)日:2024-02-15

    申请号:US18259267

    申请日:2021-11-08

    摘要: Provided is an oxide fluorescent material having a light emission peak in a wavelength range from red light to near-infrared light.
    The oxide fluorescent material has a composition including: a first element M1 being at least one element selected from the group consisting of Li, Na, K, Rb, and Cs; a second element M2 being at least one element selected from the group consisting of Ca, Sr, Mg, Ba, and Zn; Ge; O (oxygen); and Cr, the composition optionally including: a third element M3 being at least one element selected from the group consisting of Si, Ti, Zr, Sn, Hf, and Pb; and a fourth element M4 being at least one element selected from the group consisting of Eu, Ce, Tb, Pr, Nd, Sm, Yb, Ho, Er, Tm, Ni, and Mn. When the molar ratio of Ge, or the total molar ratio of the third element M3 and Ge in the case of comprising the third element M3, in 1 mol of the composition of the oxide fluorescent material is 6, the molar ratio of the first element M1 is 1.5 or more and 2.5 or less, the molar ratio of the second element M2 is 0.7 or more and 1.3 or less, the molar ratio of the third element M3 is 0 or more and 0.4 or less, the molar ratio of O (oxygen) is 12.9 or more and 15.1 or less, and the molar ratio of Cr is 0.2 or less. The oxide fluorescent material has a light emission peak wavelength of 700 nm or more and 1,050 nm or less in a light emission spectrum of the oxide fluorescent material.