高浓度锰掺杂Ca14Zn6Al10O35荧光粉的近红外第二窗口发光  

Heavy Mn-Doped Ca14Zn6Al10O35 Phosphor and Its Near-Infrared Ⅱ Light Emission

作　　者：廖子锋 赵韦人[1] 黄浩 宋静周 Liao Zi-feng;Zhao Wei-ren;Huang Hao;Song Jing-zhou(School of Physics and Optoelectronic Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学物理与光电工程学院,广东广州510006

出　　处：《广东工业大学学报》2021年第1期97-103,110,共8页Journal of Guangdong University of Technology

基　　金：广东省科学技术厅应用型科技研发及重大科技成果转化专项(2017B010127002)。

摘　　要：为了开发新型的深红光或红外发光材料,通过高温固相法在空气中合成了锰掺杂Ca14Zn6Al10O35:Mn荧光粉。采用X射线衍射、反射光谱、荧光光谱、荧光衰减寿命系统研究了该材料的晶体结构及发光性能。结果表明,样品中同时存在着Mn^4+和Mn^5+的荧光发射,前者在深红波段,后者在近红外波段。当12.5%的Al离子被Mn离子替代时,Mn^5+离子的发射达到最强。Mn^5+离子发射是窄带发射,峰值在1157 nm处,对应^1E→^3A2跃迁,荧光寿命为87.46 ms。Mn^5+离子的红外发射的温度敏感性在368 K时达到最大值0.0024 K^–1。此外还观察到了由Mn^4+向Mn^5+的能量传递现象。能量传递拓展了Mn^5+离子发射的激发波长范围,使得商用蓝光芯片能激发Mn^5+的近红外光发射。这种荧光粉能被650 nm的光激发,而在1157 nm处发射,对生物的实时检测有重要的意义。因此,该荧光粉是一种具有多方面应用潜力的红外材料。Aiming at exploring new phosphors with deep red or near infrared emission,Mn ion activated Ca14Zn6Al10O35 phosphor was synthesized using high-temperature solid-state method in the air.The spectra of Xray diffraction curves,reflection spectra,photoluminescence spectra,as well as photoluminescence decay curves,of the phosphors were measured.Both deep red and near infrared emission from Mn^4+and Mn^5+ions respectively,were observed.The emission of Mn^5+ion reaches a maximum when Mn ions substitutes 12.5%Al site in Ca14Zn6Al10O35.Mn^5+ion shows an intense narrow band emission centering at 1157 nm due to its ^1E→^3A2 transition,with the lifetime 87.46 ms in Ca14Zn6Al8.75Mn1.25O35.The temperature sensitivity of the near infrared emission reaches a maximum 0.0024 K^–1 at 368 K.It is worth noticed that the energy transfer from Mn^4+to Mn^5+is observed,which extend the excitation band of Mn^5+widely and enable to excite the infrared emission of Mn^5+by the commercial InGaN blue chips.Moreover,the excitation and emission peaks locating at 650 nm and 1157 nm respectively are beneficial for real-time biological detection.Thus,we believe that the phosphor has great potential as a multi-functional infrared emission material.

关 键 词：Mn^5+ 红外发射 宽谱激发 能量传递 

分 类 号：O482.31[理学—固体物理]