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作 者:刘姝婷 刘春光[1] 张猛[1] 杨健[1] 祝汉成[1] 刘玉学[1] LIU Shu-ting;LIU Chun-guang;ZHANG Meng;YANG Jian;ZHU Han-cheng;LIU Yu-xue(School of Physics,Northeast Normal University,Changchun 130024,China)
机构地区:[1]东北师范大学物理学院
出 处:《人工晶体学报》2019年第7期1240-1246,共7页Journal of Synthetic Crystals
基 金:国家自然科学基金(11674050,11374047,11874103)
摘 要:采用高温固态烧结方法制备了具有不同Mn^4+离子掺杂浓度的Lu2O3∶x%Mn^4+荧光粉。应用X射线衍射、荧光激发和发射光谱、X射线光电子能谱、扫描电子显微镜和发光动力学测量等手段研究了该荧光粉的微结构和发光特性与掺杂浓度的关系。实验结果表明,Mn^4+离子可掺杂到Lu2O3基质晶格中,在252nm激发下,可观察到位于695nm和712nm的近红外发射峰,其分别来源于Mn^4+离子的2E→4A2和4T2→4A2的跃迁。当Mn^4+掺杂浓度为0.1%时,可获得最大的发光强度。通过优化热处理条件(在空气气氛、1400℃温度下热处理5h),可进一步提高Lu2O3∶0.1%Mn^4+荧光粉的近红外发光强度和余辉性能。实验发现,经热处理的Lu2O3∶0.1%Mn^4+样品中,Mn^4+离子占据了Lu2O3基质中的S6和C2两种格位;具有较长寿命的近红外发光来自占据S6格位Mn^4+离子的贡献,而具有较短寿命的近红外发光则来自占据C2格位Mn^4+离子的贡献。实验表明,经高温热处理的近红外发射Lu2O3∶Mn^4+材料余辉时间大于3min,其在生物成像方面有潜在的应用前景。Novel near infrared(NIR)emitting Lu2O3∶x%Mn^4+phosphors with different concentrations were prepared by a high temperature solid-state method.The dependences of the microstructural and luminescent properties of the phosphor on the Mn^4+doping concentration were investigated by means of X-ray diffraction,excitation and emission spectra,X-ray photoelectron spectroscopy,scanning electron microscope and luminescence dynamics measurement.It is found that Mn^4+can be doped into the Lu2O3 host and NIR emissions peaked at 695 nm and 712 nm,which originate from the 2E→4A 2 and 4T 2→4A 2 transitions,respectively,can be observed upon 252 nm excitation.When the Mn^4+doping concentration is 0.1%,the strongest luminescent intensity can be reached.After the Lu2O3∶0.1%Mn^4+phosphor was annealed at 1400℃in air for 5 h,its NIR emission intensity and afterglow performances were significantly improved.For the annealed Lu2O3∶0.1%Mn^4+phosphor,it is found that Mn^4+occupy S 6 and C 2 sites in the Lu2O3 host.The NIR emission with longer lifetime comes from the contribution of Mn^4+occupying S 6 sites,while that with shorter lifetime comes from the contribution of Mn^4+occupying C 2 sites.The afterglow time of NIR emitting Lu2O3∶Mn^4+phosphor is more than 3 min,suggesting it has potential application in bioimaging.
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