Polarized upconversion luminescence(UCL)of lanthanide-doped micro/nano-crystals has shown great promise in single-particle tracking and super-resolution bioimaging.However,because of the spectral line broadening and m...Polarized upconversion luminescence(UCL)of lanthanide-doped micro/nano-crystals has shown great promise in single-particle tracking and super-resolution bioimaging.However,because of the spectral line broadening and multiple sites of lanthanide in upconversion particles(UCPs),the crystal-field(CF)polarization components of UCL are usually undistinguishable.Herein,we report the linearly polarized UCL in LiLuF_(4):Yb^(3+)/Er^(3+) single microcrystals with resolvable CF transition lines and a polarization degree up to 0.82.The CF levels and CF transition lines of Er^(3+),as well as their emission polarization anisotropy,are unraveled for the first time through low-temperature and high-resolution photoluminescence(PL)and UCL spectroscopies.By taking advantage of the well-resolved and highly-polarized CF transition lines of Er^(3+),we demonstrate the application of LiLuF_(4):Yb^(3+)/Er^(3+) single microcrystals as anisotropic UCL probes for orientation tracking.These findings provide fundamental insights into the polarization anisotropy of UCL in lanthanide-doped single particles,thus laying a foundation for the future design of anisotropic luminescent probes towards versatile applications.展开更多
利用Nd:YAG脉冲激光器,在空气环境下作用于金属材料Cu,分别获得了119.1、154.6、201.7、256.2 m J?Pulse^(-1)四种不同能量下的等离子体特征谱线,选取CuΙ510.5 nm和521.8 nm两条谱线作为研究对象,分析了谱线强度与能量变化之间的关系,...利用Nd:YAG脉冲激光器,在空气环境下作用于金属材料Cu,分别获得了119.1、154.6、201.7、256.2 m J?Pulse^(-1)四种不同能量下的等离子体特征谱线,选取CuΙ510.5 nm和521.8 nm两条谱线作为研究对象,分析了谱线强度与能量变化之间的关系,发现其展宽线型分别为Lorenz线型和Gauss线型。结果表明,对于Cu等离子体发射光谱,不同波段所对应谱线的展宽机制不同,随着激光能量的增大,谱线的强度逐渐增大,谱线的半宽高也随着激光能量的增加有所增大。展开更多
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(CAS,XDB20000000)the National Natural Science Foundation of China(U1805252,21875250,11774345,12074379,21771185,12074380,and 21975257)+1 种基金the Youth Innovation Promotion Association of the CAS(2020305)the Natural Science Foundation of Fujian Province(2020I0037).
文摘Polarized upconversion luminescence(UCL)of lanthanide-doped micro/nano-crystals has shown great promise in single-particle tracking and super-resolution bioimaging.However,because of the spectral line broadening and multiple sites of lanthanide in upconversion particles(UCPs),the crystal-field(CF)polarization components of UCL are usually undistinguishable.Herein,we report the linearly polarized UCL in LiLuF_(4):Yb^(3+)/Er^(3+) single microcrystals with resolvable CF transition lines and a polarization degree up to 0.82.The CF levels and CF transition lines of Er^(3+),as well as their emission polarization anisotropy,are unraveled for the first time through low-temperature and high-resolution photoluminescence(PL)and UCL spectroscopies.By taking advantage of the well-resolved and highly-polarized CF transition lines of Er^(3+),we demonstrate the application of LiLuF_(4):Yb^(3+)/Er^(3+) single microcrystals as anisotropic UCL probes for orientation tracking.These findings provide fundamental insights into the polarization anisotropy of UCL in lanthanide-doped single particles,thus laying a foundation for the future design of anisotropic luminescent probes towards versatile applications.
文摘利用Nd:YAG脉冲激光器,在空气环境下作用于金属材料Cu,分别获得了119.1、154.6、201.7、256.2 m J?Pulse^(-1)四种不同能量下的等离子体特征谱线,选取CuΙ510.5 nm和521.8 nm两条谱线作为研究对象,分析了谱线强度与能量变化之间的关系,发现其展宽线型分别为Lorenz线型和Gauss线型。结果表明,对于Cu等离子体发射光谱,不同波段所对应谱线的展宽机制不同,随着激光能量的增大,谱线的强度逐渐增大,谱线的半宽高也随着激光能量的增加有所增大。
