夜视成像用Cs_(2)NaYCl_(6)∶Sb,Ln荧光粉宽带近红外发光性能  

Broadband Near-infrared Luminescence Performance of Cs_(2)NaYCl_(6)∶Sb,Ln Phosphors for Night Vision Imaging Systems

作　　者：刘博 徐赛 常江龙 李由 陈宝玖 LIU Bo;XU Sai;CHANG Jianglong;LI You;CHEN Baojiu(School of Science,Dalian Maritime University,Dalian 116026,China)

机构地区：[1]大连海事大学理学院,辽宁大连116026

出　　处：《发光学报》2024年第7期1095-1103,共9页Chinese Journal of Luminescence

基　　金：国家自然科学基金(52071048,52001047)。

摘　　要：采用水热法成功制备了Sb^(3+)/Ln^(3+)(Ln=Nd,Ho,Er,Tm)共掺的Cs_(2)NaYCl_(6)无铅双钙钛矿材料。通过X射线衍射、扫描电子显微镜等表征手段对其结构和形貌进行了研究;通过激发、发射光谱和荧光衰减曲线的测量,讨论了其发光性能及能量传递机理。实验结果表明,在紫外光激发下,对于Cs_(2)NaYCl_(6)基质材料,在掺杂微量Sb^(3+)后,能够产生宽带自陷激子(STEs)发光。在其中进一步掺杂三价稀土离子,在320 nm激发下,发射光谱中可观察到稀土离子在可见及近红外区域的特征发射峰,通过对激发光谱及荧光衰减曲线的分析,证实了STEs与稀土离子之间存在能量传递。最后,将所制备的荧光粉直接进行物理混合并涂覆到商用340 nm紫外LED芯片上,制备了宽覆盖近红外荧光粉转换LED,实现了由紫外转换为近红外区域的宽带调制发光,近红外发射波段覆盖800~1600 nm。荧光粉转换LED的使用大大简化了近红外装置的构造,降低了生产成本。其灵活可调、小型便捷及近红外波段宽覆盖性,很好地满足于夜视成像系统光源的要求。Cs_(2)NaYCl6 lead-free double perovskite materials doped with Sb^(3+)/Ln^(3+)(Ln=Nd,Ho,Er,Tm)were suc⁃cessfully prepared by hydrothermal method.The structure and morphologies were studied through X-ray diffraction and scanning electron microscopy.By measuring the photoluminescence spectra,photoluminescence excitation spec⁃tra,and fluorescence decay curves,the luminescence and energy transfer mechanisms were discussed.The experi⁃mental results show that under UV excitation,Cs_(2)NaYCl6 matrix material can generate broadband self-trapped exci⁃ton(STEs)luminescence after doping with trace amounts of Sb^(3+).Further doping with rare earth ions,under excita⁃tion at 320 nm,characteristic emission peaks of rare earth ions in the visible and near-infrared regions can be ob⁃served.It is confirmed that there is energy transfer between STEs and rare earth ions,through analysis of the emis⁃sion spectrum and fluorescence decay curves.Finally,the prepared fluorescent powders were directly physically mixed and coated onto a commercial 340 nm ultraviolet LED chip to prepare a wide coverage near-infrared LED,the near-infrared emission band covers 800−1600 nm.The use of fluorescent powder conversion LEDs greatly simplifies the construction of near-infrared devices and reduces production costs.It is flexible,compact,convenient,and widecovered in the near-infrared band,which well meets the requirements of night vision imaging system light sources.

关 键 词：双钙钛矿 稀土离子掺杂 能量传递 近红外LED 

分 类 号：O482.31[理学—固体物理]