| K2LaBr5∶Pr晶体的生长及发光性能研究 |
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| 引用本文： | 熊建辉,王昊宇,杨晨乐,潘尚可,陈红兵,潘建国.K2LaBr5∶Pr晶体的生长及发光性能研究[J].人工晶体学报,2021,50(8):1402-1407. |
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| 作者姓名： | 熊建辉 王昊宇 杨晨乐 潘尚可 陈红兵 潘建国 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金(61775108,61875096) |
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| 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(3P1→3H4)、绿光(3P0→3H4,3P1→3H5)、橙光(3P1→3H6,3P1→3F2)、红光(3P0→3F2,3P1→3F3)、深红光(3P1→3F4),及紫光(3P0→3F4)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%。
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| 关 键 词： | 稀土卤化物 K2LaBr5∶Pr 坩埚下降法 光致发光 衰减时间 |
| 收稿时间： | 2021-05-18 |
Growth and Luminescence Properties of K2LaBr5∶Pr Crystal |
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| XIONG Jianhui,WANG Haoyu,YANG Chenyue,PAN Shangke,CHEN Hongbing,PAN Jianguo.Growth and Luminescence Properties of K2LaBr5∶Pr Crystal[J].Journal of Synthetic Crystals,2021,50(8):1402-1407. |
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| Authors: | XIONG Jianhui WANG Haoyu YANG Chenyue PAN Shangke CHEN Hongbing PAN Jianguo |
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| Affiliation: | Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China |
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| 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 (3P1→3H4), green light (3P0→3H4,3P1→3H5), orange light (3P1→3H6,3P1→3F2), red light (3P0→3F2,3P1→3F3), deep red light (3P1→3F4), purple light (3P0→3F4) 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. |
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| Keywords: | rare earth halide K2LaBr5∶Pr Bridgman technique photoluminescence decay time |
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