Ni2+-doped MgTa2O6 phosphors capable of near-infrared II and III emission under blue-light excitation

荧光粉 材料科学 四方晶系 激发态 兴奋剂 激发 分析化学(期刊) 波长 发光二极管 蓝移 光电子学 半最大全宽 红外线的 发光 八面体 光学 光致发光 晶体结构 化学 原子物理学 结晶学 物理 量子力学 色谱法
作者
Fengmei Zhu,Yuan Gao,Boming Zhu,Ling Huang,Jianbei Qiu
出处
期刊:Chemical Engineering Journal [Elsevier]
卷期号:479: 147568-147568 被引量:16
标识
DOI:10.1016/j.cej.2023.147568
摘要

Presently, Ni2+-activated near-infrared (NIR) phosphors still have disadvantages such as relatively short emission wavelength and narrow half-peak width, mismatched excitation wavelength to that of commercially available high-efficiency blue chips. Here, Ni2+-doped tetragonal MgTa2O6 NIR phosphor was successfully prepared by high-temperature solid phase method. The matrix material provided an octahedral lattice for Ni2+ to replace Ta5+ in the [TaO6] octahedron of the crystal lattice. Under the excitation of 470 nm blue light, Ni2+ was excited through 3T2(F)→3A2(F) spin-allowed transition and emitted an ultra-broadband NIR light that was 1300–2000 nm in wavelength, peaked ∼ 1620 nm, covered the NIR-II and NIR-III regions, had a full width at half maximum reached 297 nm, and a PLQY of 25.62 %. The unique ultra-broadband and long wavelength NIR emission by this phosphor was derived from Ni2+ which is situated in a weak crystal field environment due to space asymmetric distortion caused by a high charge polarization surrounding the center of the [TaO6] octahedron in a MgTa2O6 matrix. A NIR pc-LED was constructed using Ni2+-doped near-infrared phosphors packaged with a commercial high-efficiency blue LED chip (@ 470 nm), and its application prospect was demonstrated by NIR night vision monitoring and nondestructive imaging of venous in human fingers.
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