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人工晶体学报 ›› 2021, Vol. 50 ›› Issue (8): 1402-1407.

• 研究论文 • 上一篇    下一篇

K2LaBr5∶Pr晶体的生长及发光性能研究

熊建辉1, 王昊宇1, 杨晨乐1, 潘尚可1,2, 陈红兵1,2, 潘建国1,2   

  1. 宁波大学材料科学与化学工程学院, 浙江省光电探测材料及器件重点实验室,宁波 315211
  • 收稿日期:2021-05-18 出版日期:2021-08-15 发布日期:2021-09-14
  • 通讯作者: 潘建国,博士,教授。E-mail:panjianguo@nbu.edu.cn
  • 作者简介:熊建辉(1996—),男,江西省人,硕士研究生。E-mail:xjh18770455088@163.com
  • 基金资助:
    国家自然科学基金(61775108,61875096)

Growth and Luminescence Properties of K2LaBr5∶Pr Crystal

XIONG Jianhui1, WANG Haoyu1, YANG Chenyue1, PAN Shangke1,2, CHEN Hongbing1,2, PAN Jianguo1,2   

  1. Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
  • Received:2021-05-18 Online:2021-08-15 Published:2021-09-14

摘要: 通过高温固相法合成Pr3+不同掺杂浓度的K2LaBr5多晶料,采用垂直坩埚下降法生长出K2LaBr5∶Pr单晶,并对晶体进行一系列加工,得到ø12 mm×5 mm的圆柱透明晶体。该晶体属于正交晶系,晶胞参数为a=1.336 0 nm,b=0.992 7 nm,c=0.846 2 nm,Z=4,晶体密度为3.908 g/cm3,熔点为607 ℃。测试了该晶体的X射线粉末衍射、X射线激发发射光谱、光致发光光谱、透过率等。在紫外光以及X射线的激发下,K2LaBr5∶Pr晶体在480~750 nm波长范围内呈现蓝光(3P13H4)、绿光(3P03H4,3P13H5)、橙光(3P13H6,3P13F2)、红光(3P03F2,3P13F3)、深红光(3P13F4),及紫光(3P03F4)等多个可见波长的光输出,表明该晶体具有优良的发光性能。在X射线的激发下,在360~440 nm范围内还观察到一个宽带4f 5d-4f2发射跃迁。稳态瞬态荧光光谱分析仪测出光致衰减时间为10 μs左右,紫外可见分光光度计则测出晶体在可见光波段的透过率达到88%。

关键词: 稀土卤化物, K2LaBr5∶Pr, 坩埚下降法, 光致发光, 衰减时间

Abstract: K2LaBr5 polycrystalline materials with different doping concentrations of Pr3+ were synthesized by high-temperature solid-state method, and the K2LaBr5∶Pr single crystals were grown by vertical Bridgman technique, and cylindrical transparent crystals with ø12 mm×5 mm were obtained by a series of processing. The crystal belongs to the orthogonality system and the cell parameters has been determined as a=1.336 0 nm, b=0.992 7 nm, c=0.846 2 nm, Z=4, the crystal density is 3.908 g/cm3, the melting point is 607 ℃. The crystals were characterized by powder X-ray diffraction, X-ray excitation emission spectrum, photoluminescence spectrum, transmittance and so on. Under the excitation of ultraviolet light and X-ray, the K2LaBr5∶Pr crystal exhibits blue light (3P13H4), green light (3P03H4,3P13H5), orange light (3P13H6,3P13F2), red light (3P03F2,3P13F3), deep red light (3P13F4), purple light (3P03F4) and other visible wavelengths of light output in the wavelength range of 480 nm to 750 nm, which indicates that the crystal has excellent luminescent properties. Under X-ray excitation, a broadband 4f 5d-4f2 emission transition is also observed in the range of 360 nm to 440 nm. The scintillation decay time of K2LaBr5∶Pr crystal is about 10 μs, which is measured by the steady-state transient fluorescence spectrophotometer, and the transmittance of the crystal in the visible range is 88% measured by the ultraviolet-visible spectrophotometer.

Key words: rare earth halide, K2LaBr5∶Pr, Bridgman technique, photoluminescence, decay time

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