摘要
采用Chzochralski方法成功生长了Dy^(3+)掺杂的SrGdGa_(3)O_(7)晶体,并对其结构和光学特性进行了详细研究。基于XRD数据,采用Rietveld法优化了晶体的晶格参数。分析了Dy:SrGdGa_(3)O_(7)晶体的偏振吸收谱、偏振发射谱和荧光衰减曲线。在452 nm处,π偏振和σ偏振对应的吸收截面分别为0.594×10^(-21)和0.555×10^(-21)cm^(2)。计算得到的有效J-O强度参数Ω_(2)、Ω_(4)和Ω_(6)分别为5.495×10^(-20)、1.476×10^(-20)和1.110×10^(-20)cm^(2)。J-O理论分析和荧光光谱表明:在452 nm激发下,Dy:SrGdGa_(3)O_(7)晶体4F9/2→6H_(13/2)跃迁在可见光波段具有最高的荧光分支比和荧光强度,在574 nm处的π和σ偏振发射截面分别为1.84×10^(-21)和2.49×10^(-21)cm^(2)。Dy^(3+):4F9/2能级的辐射寿命和荧光寿命分别为0.768和0.531 ms,量子效率为69.1%。研究结果表明:Dy^(3+):SrGdGa_(3)O_(7)晶体是一种潜在的可用于蓝光LD泵浦实现黄激光的材料。
Dy^(3+)-doped SrGdGa_(3)O_(7)crystal was successfully grown through the Czochralski method and investigated in detail for its structural and optical features.Its crystallographic lattice parameters were optimized by Rietveld refinement based on XRD data.Polarized absorption spectra,polarized emission spectra,and fluorescence decay curves of Dy:SrGdGa_(3)O_(7)crystal were analyzed.Absorption cross-sections at 452 nm corresponding toπ-andσ-polarization were computed as 0.594×10^(-21)and 0.555×10^(-21)cm^(2),respectively.Calculated effective J-O intensity parametersΩ_(2),Ω_(4),andΩ_(6) were 5.495×10^(-20),1.476×10^(-20),and 1.110×10^(-20)cm^(2),respectively.J-O analysis and emission spectra show that transition 4F9/2→6H_(13/2)of Dy:SrGdGa_(3)O_(7)crystal has the highest fluorescence branching ratio and fluorescence intensity under 452 nm excitation within the visible spectral region,the emission cross-sections ofπ-andσ-polarization were 1.84×10^(-21)and 2.49×10^(-21)cm^(2)at the wavelength of 574 nm,respectively.The measured radiative lifetime and fluorescence decay time of the Dy^(3+):4F9/2 level were 0.768 and 0.531 ms with a quantum efficiency of 69.1%.All these results reveal that Dy^(3+):SrGdGa_(3)O_(7)crystal is a promising material for yellow lasers pumped with blue laser diodes.
作者
王海东
王燕
朱昭捷
李坚富
LAKSHMINARAYANA Gandham
涂朝阳
WANG Haidong;WANG Yan;ZHU Zhaojie;LI Jianfu;LAKSHMINARAYANA Gandham;TU Chaoyang(Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China;University of Chinese Academy of Sciences,Beijing 100049,China;Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China;Intelligent Construction Automation Center,Kyungpook National University,Daegu 41566,Republic of Korea)
出处
《无机材料学报》
SCIE
EI
CSCD
北大核心
2023年第12期1475-1482,共8页
Journal of Inorganic Materials
基金
National Natural Science Foundation of China(51832007,51872286)
National Key Research and Development Program of China(2022YFB3605704)
NSFC-Joint Funds for Regional Innovation and Development(U21A20508)
Science and Technology Plan Leading Project of Fujian Province(2022H0043,2020H0036)
Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZR204,2020zz108)
The 14th Five-year Plan Project of FJIRSM(E255KL0101)
Science and Technology Service Network Initiative(2019T3006)。
