摘要
采用传统高温固相法成功合成了一系列Mn^(4+)/Er^(3+)共掺杂的LaAlO_3近红外发光荧光粉,并利用X射线粉末衍射(XRD)、荧光光谱及荧光衰减等手段对荧光粉的结构与发光性质进行了研究。结果发现,当激发Mn^(4+)离子时,在LaAlO_3∶Mn^(4+)/Er^(3+)荧光粉中可以观察到较强的近红外发射,分别对应于Er^(3+)的~4I_(11/2)→~4I_(15/2)(990nm)及~4I_(13/2)→~4I_(15/2)(1 552 nm),这表明Mn^(4+)与Er^(3+)之间存在着有效的能量传递。在LaAlO_3∶Mn^(4+)/Er^(3+)荧光粉中,最佳的Er^(3+)的掺杂浓度为2%(摩尔分数),进一步增加Er^(3+)掺杂浓度将导致浓度猝灭的发生。Er^(3+)浓度依赖的Mn^(4+)荧光寿命分析进一步表明了在LaAlO_3∶Mn^(4+)/Er^(3+)荧光粉中存在着Mn^(4+)到Er^(3+)的能量传递过程,并且证实其能量传递机理为电四极-电四极相互作用。
A series of Mn4+Er3+co doped LaAlO3near infrared phosphors were synthesized by conventional high temperature solid state reaction.The structure and luminescence properties were characterized by X ray diffraction(XRD),fluorescence spectra and the fluorescence decay curves.The results show that when the Mn4+is excited,the LaAlO3∶Mn4+/Er3+phosphors exhibit strong near infrared emission of Er3+,which are corresponded to the4I11/2→4I15/2(990nm)and4I13/2→4I15/2(1552nm)of Er3+respectively,indicating that there is an efficient energy transfer from Mn4+to Er3+.The optimal Er3+doping concentration is2mol%in the LaAlO3∶Mn4+/Er3+phosphors.And it is observed that concentration quenching occurs with the continuous increase of Er3+doping concentration.It further reveals the existence of energy transfer from Mn4+to Er3+in the LaAlO3∶Mn4+/Er3+phosphors by the fluorescence lifetime analysis of Mn4+depended on the Er3+concentration.Moreover,it is confirmed that a quadrupole quadrupole interaction is responsible for the energy transfer mechanism from Mn4+to Er3+.
作者
陈慧
田跃
崔彩娥
黄平
王磊
时秋峰
CHEN Hui;TIAN Yue;CUI Caie;HUANG Ping;WANG Lei;SHI Qiufeng(College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2017年第12期12125-12129,12134,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51302182)