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 
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-xEuxCl3x=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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