Crystal-field induced tuning of luminescence properties of Na3GaxAl1-xF6:Cr3+ phosphors with good thermal stability for NIR LEDs.
Crystal-field induced tuning of luminescence properties of Na3GaxAl1-xF6:Cr3+ phosphors with good thermal stability for NIR LEDs.
复制标题
晶体场诱导调节 Na3GaxAl1-xF6:Cr3 荧光粉的发光性能，该荧光粉具有良好的热稳定性，适用于近红外 LED。
DOI：
10.1039/d2dt01559e
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发表时间：
2022
影响因子：
4
通讯作者：
Jiansheng Huo
中科院分区：
文献类型：
--
作者：
Jian;Pengyun Chen;Junhao Li;Mingming Yang;Wei Jiang;Qiuhong Zhang;Haiyong Ni;Jiansheng Huo
Cr3+-Activated broadband near-infrared (NIR) luminescence materials are attracting much attention as next-generation smart NIR light sources that are widely used in night vision, bioimaging, medical treatment, and many other fields. Herein, a series of Na3GaxAl1-xF6:Cr3+ NIR phosphors with broadband emission and tunable luminescence properties were designed and prepared. The luminescence intensity, peak position and full width at half maximum (FWHM) of the materials can be controlled by adjusting the crystal field strength. Furthermore, Na3Ga0.75Al0.25F6:0.35Cr3+ exhibited high luminous efficiency and the emission intensity remained 81% at 423 K compared with the initial value at 298 K. The structural confinement and the electron-phonon coupling (EPC) effect may account for its good thermal stability. Finally, a pc-NIR-LED device with a photoelectric conversion efficiency of 6.53% at 350 mA was fabricated by combining the as-prepared NIR phosphor and a blue InGaN chip, and its applications in night vision and medical fields were further investigated. This work will promote the development of NIR phosphors with tunable luminescence properties.
