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机构地区:[1]长春理工大学化学与环境工程学院,吉林长春130022 [2]中国检验检疫科学研究院,北京100123
出 处:《光谱学与光谱分析》2015年第12期3485-3489,共5页Spectroscopy and Spectral Analysis
基 金:国家重大科学仪器设备开发专项(2012YQ090197);国家"十二五"科技支撑计划项目(2012BAK26B04);吉林省科技发展计划重点项目(201220223);国家质检总局科研项目(2012IK013)资助
摘 要:采用微乳液法、油酸辅助溶剂热法、超声波辅助溶剂热法分别合成了LaCeF_3∶Tb微晶。使用超声波辅助溶剂热法合成LaCeF_3∶Tb微晶鲜有报道。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、荧光光谱(PL)等方法对样品的晶相、形貌和发光性能进行了表征。XRD结果表明产物结晶良好,微晶与标准卡片PDF#38-0452(六方相LaCeF_3)对应;SEM图像显示产物形貌、尺寸均一;在250nm光的激发下,纳米粒子发出强绿色光,主要发射峰分别归属于Tb^(3+)的5 D4→7 F_6(489nm),~5D_4→~7F_5(543nm),~5D_4→~7F_4(585nm)和~5D_4→~7F_3(621nm)跃迁。通过对LaCeF_3和LaCeF_3∶Tb光谱的研究证明了Ce→Tb能量传递的存在。计算了Tb在不同方法合成的LaCeF_3微晶中的临界掺杂浓度。LaCeF3 : Tb microcrystaltine was synthesized by microemulsion method, oleic acid-assisted solvothermal method, ultrasonic-assisted solvothermal method separately. LaCeF3 : Tb microcrystalline synthesized by ultrasonic-assisted solvothermal method is rarely reported. Using X-ray diffraction (XRD), scanning electron microscope (SEM), fluorescence spectroscopy (PL) method such as the crystal phase, morphology and luminescence properties of the samples have been characterized. XRD results show that the crystallization product is good, microcrystalline and standard card PDF# 38-0452 (the six-party LaCeF3) is corresponding, SEM images showing the product has uniform size and morphology, under 250 nm excitation nanoparticles shows strong green light, the main emission peaks respectively belonged to ^5D4→^7F6 (489 nm), ^5D4→^7F5 (545 nm), ^5D4→^7F4 (585 nm)and ^5D4→^7F3 (621 nm) transition of Tb^3+. Through LaCeF3 and LaCeF3 : Tb spectral studies prove the existence of the Ce-Tb energy transfer. Calculated the critical doping concentration of Tb in LaCeF3 microcrystalline synthesized by different methods.
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