Eu2+掺杂KCaCl3晶体的生长及发光性能 |
Growth and Luminescence Properties of Eu2+ Doped KCaCl3 Crystal |
作者 | 单位 | E-mail | 李嫚 | 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 | | 耿巨峰 | 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 | | 王昊宇 | 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 | | 杨晨乐 | 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 | | 潘尚可 | 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 | | 潘建国 | 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 | panjianguo@nbu.edu.cn |
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摘要: 通过坩埚下降法生长出不同物质的量分数Eu2+掺杂的KCa1-xEuxCl3(x=0.005、0.01、0.02、0.03、0.05)单晶,并对晶体进行了X射线粉末衍射、热重、透过率、光致发光光谱、衰减时间、X射线激发发射光谱等测定。通过相图及结构分析,判断出该晶体为一致熔融化合物,并得出其为正交结构,晶胞参数为a=0.756 04 nm,b=1.048 23 nm,c=0.726 57 nm,空间群为Pnma(62)。在紫外光的激发下,晶体在434 nm左右有一个宽的发射峰,对应于Eu2+的4f65d1→4f7跃迁;光致衰减时间1.473 μs,晶体在X射线激发下的发光强度随Eu2+离子浓度增加而增强。 |
关键词: KCaCl3:Eu 坩埚下降法 光致发光 X射线发光 |
基金项目: 国家自然科学基金(No.61775108,61875096)资助。 |
Abstract: Single crystals of KCa1-xEuxCl3 (x=0.005, 0.01, 0.02, 0.03, 0.05) doped with different Eu2+ ion molar fractions have been grown successfully by Bridgman-Stockbarger technique. The crystals were characterized by powder X-ray diffraction, thermogravimetry, transmittance, photoluminescence spectrum, decay time and X-ray excitation emission spectrum. Through phase diagram and structure analysis, the crystal is regarded as a congruent compound and belongs to orthorhombic system. The unit cell parameters are determined as:a=0.756 04 nm, b=1.048 23 nm, c=0.726 57 nm, space group:Pnma(62). Under the excitation of ultraviolet light, the crystal exhibited a broad emission around 434 nm, which can be attributed to the 4f65d1→4f7 transition of Eu2+. The result exhibited that the emission spectra with the maximum which position was shifted from 427 to 436 nm with the increase of Eu2+ doped concentration. The photolumimnescence decay time was 1.473 μs, moreover, the intensity of X-ray luminescence spectra continued to increase with the Eu2+ ion concentration. |
Keywords: KCaCl3:Eu Bridgman technique photoluminescence X-ray luminescence |
投稿时间:2020-08-08 修订日期:2020-11-20 |
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李嫚,耿巨峰,王昊宇,杨晨乐,潘尚可,潘建国.Eu2+掺杂KCaCl3晶体的生长及发光性能[J].无机化学学报,2021,37(3):443-447. |
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