Lu^(3+)掺杂Na_(5)Y_(9)F_(32)∶Ho^(3+)/Yb^(3+)/Ce^(3+)单晶体的增强红色上转换发光与光学温度传感性能  

Enhanced Red Up-conversion Emission of Lu^(3+)Doped Na_(5)Y_(9)F_(32)∶Ho^(3+)/Yb^(3+)/Ce^(3+)Single Crystal and Optical Temperature Sensing Performance

作　　者：徐义松 方立志 夏海平[1] 周雄[1] 宋宏伟[2] XU Yisong;FANG Lizhi;XIA Haiping;ZHOU Xiong;SONG Hongwei(School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,China;College of Electronic Science and Engineering,Jilin University,Changchun 130012,China)

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315211 [2]吉林大学电子科学与工程学院,吉林长春130012

出　　处：《发光学报》2024年第7期1104-1113,共10页Chinese Journal of Luminescence

基　　金：国家自然科学基金(62275133);浙江省自然科学基金(LY22E020002)。

摘　　要：采用密封的坩埚下降法技术生长了一系列Lu^(3+)(摩尔分数0、0.6%、1.2%、1.8%)掺杂Na_(5)Y_(9)F_(32)∶Ho^(3+)/Yb^(3+)/Ce^(3+)单晶体。在980 nm LD激发下,观察到单晶体的绿光543 nm(^(5)S_(2)/^(5)F_(4)→^(5)I_(8))、红光656 nm(^(5)F_(5)→^(5)I_(8))以及近红外750 nm(^(5)S_(2)/^(5)F4→^(5)I_(7))上转换发光。从上转换发光强度随激发光强度的变化情况,确定了543 nm、656 nm与750 nm的发光为双光子跃迁过程。研究了Lu^(3+)离子掺杂浓度对其发光强度与荧光寿命的影响情况,随着Lu^(3+)掺杂浓度从0增加到1.8%,单晶体中的656 nm红光逐步增强,543 nm绿光与750 nm近红外光随之减弱,红绿光强度比从0.01增加到了1.55,而543 nm荧光寿命从1.29 ms降低至0.99 ms。Lu^(3+)离子的掺入取代Y^(3+)晶格位,改变了单晶体的局域场环境,导致上转换发光强度的变化。基于随温度变化的上转换红光656 nm(^(5)F5→^(5)I8)与绿光543 nm(^(5)S_(2)/^(5)F4→^(5)I8)的发光强度变化,研究了1.8%Lu^(3+)掺杂Na_(5)Y_(9)F_(32)∶Ho^(3+)/Yb^(3+)/Ce^(3+)单晶体在298~448 K范围内的绝对灵敏度和相对灵敏度最大值分别为0.242%·K^(-1)和0.217%·K^(-1)。Lu^(3+)(mole fraction 0,0.6%,1.2%,1.8%)doped Na_(5)Y_(9)F_(32)∶Ho^(3+)/Yb^(3+)/Ce^(3+)single crystals were grown using a sealed Bridgman method.When excited by 980 nm LD,up-conversion emissions at 543 nm(^(5)S_(2)/^(5)F_(4)→^(5)I_(8)),656 nm(^(5)F_(5)→^(5)I_(8))in red,and 750 nm(^(5)S_(2)/^(5)F_(4)→^(5)I_(7))in near-infrared were observed.The two-photon transition pro⁃cesses leading to these emissions were identified by analyzing changes in luminescence intensities with varying excita⁃tion light intensities.Furthermore,the impact of Lu^(3+)ion doping concentration on both up-conversion luminescence intensity and fluorescence lifetime was investigated.The 656 nm red emission in the crystal was gradually enhanced as the Lu^(3+)doping concentration increased from 0 to 1.8%.Conversely,the green emission at 543 nm and near-infra⁃red at 750 nm decreased.The ratio between red and green intensity increased from 0.01 to 1.55,while the fluores⁃cence lifetime of 543 nm decreased from 1.29 ms to 0.99 ms.The incorporation of Lu^(3+)ions replaces the lattice sites of Y^(3+)ions,altering the local field environment of the crystal,resulting in changes in the up-conversion lumines⁃cence.The maximum absolute sensitivity and relative sensitivity of 1.8%Lu^(3+)doped Na_(5)Y_(9)F_(32)∶Ho^(3+)/Yb^(3+)/Ce^(3+)single crystal in the range of 298-448 K were 0.242%·K^(-1) and 0.217%·K^(-1),respectively.

关 键 词：Na_(5)Y_(9)F_(32)单晶 增强上转换红光 Ho^(3+)/Yb^(3+)/Ce^(3+) 光学温度传感 能量转移 

分 类 号：O482.31[理学—固体物理]