Mn~(2+)掺杂对SrF_2∶Yb,Er纳米晶结构及发光性能的影响
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摘要
通过温和水热法制备了氟化锶(SrF_2)∶Yb,Er,Mn纳米晶。采用X射线衍射、扫描电子显微镜、荧光分析对制备的纳米晶微结构、形貌、发光性能进行表征。结果表明,纳米晶微结构为面心立方晶相,形貌为类球形,随着Mn~(2+)离子的掺入,样品发生晶格畸变,粒径减小,发光强度减弱,Er~(3+)离子的红/绿发光强度比增大,发光颜色从绿光区向红光区移动。分析了Mn~(2+)的掺入对样品微结构、形貌、发光性能的影响。通过样品发光强度与激发功率的关系,分析了SrF_2∶Yb,Er,Mn纳米晶的上转换发光机制。
SrF_2∶Yb,Er,Mn nanocrystals were prepared by a mild hydrothermal method.The microstructure,morphology and luminescence properties of as-prepared sample were characterized by XRD,SEM and FA.The results showed that the microstructure of sample was face-centered cubic crystal phase,and had morphology of spherical-like.With the addition of Mn~(2+) ions,the lattice of sample was distorted,the particle size decreased,the luminescence intensity weakened and the red/green luminescence ratio increased.The luminescence shifted from the green region to the red region.The effects of Mn~(2+) on the microstructure,morphology and luminescence properties of the samples were analyzed.The upconversion luminescence mechanism of sample was analyzed by the relationship between the luminescence intensity and the excitation power.
SrF_2∶Yb,Er,Mn nanocrystals were prepared by a mild hydrothermal method.The microstructure,morphology and luminescence properties of as-prepared sample were characterized by XRD,SEM and FA.The results showed that the microstructure of sample was face-centered cubic crystal phase,and had morphology of spherical-like.With the addition of Mn~(2+) ions,the lattice of sample was distorted,the particle size decreased,the luminescence intensity weakened and the red/green luminescence ratio increased.The luminescence shifted from the green region to the red region.The effects of Mn~(2+) on the microstructure,morphology and luminescence properties of the samples were analyzed.The upconversion luminescence mechanism of sample was analyzed by the relationship between the luminescence intensity and the excitation power.
引文
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[4]Tu D T,Zheng W,Liu Y S,et al.Luminescent biodetection based on lanthanide-doped inorganic nanoprobes[J].Coordination Chemistry Reviews,2014,273-274:13-29.
[5]Boyer J C,Vetrone F,Cuccia L A,et al.Synthesis of colloidal upconverting NaYF4nanocrystals doped with Er3+,Yb3+and Tm3+,Yb3+via thermal decomposition of lanthanide trifluoroacetate precursors[J].Journal of the American Chemical Society,2006,128(23):7444-7445.
[6]Yu X F,Chen L D,Li M,et al.Highly efficient fluorescence of NdF3/SiO2Core/Shell nanoparticles and the applications for in vivo NIR detection[J].Advanced Materials,2008,20(21):4118-4123.
[7]Chatterjee D K,Rufaihah A J,Zhang Y.Upconversion fluorescence imaging of cells and small animals using lanthanide doped nanocrystals[J].Biomaterials,2008,29(7):937-943.
[8]Tian G,Gu Z J,Zhou L J,et al.Mn2+dopant-controlled synthesis of NaYF4∶Yb/Er upconversion nanoparticles for in vivo imaging and drug delivery[J].Advanced Materials,2012,24(9):1226-1231.
[9]Hu Y H,Liang X H,Wang Y B,et al.Enhancement of the red upconversion luminescence in NaYF4∶Yb3+,Er3+nanoparticles by the transition metal ions doping[J].Ceramics International,2015,41(10):14545-14553.
[10]Rakov N,Guimar2es R B,Franceschini D F,et al.Er∶SrF2luminescent powders prepared by combustion synthesis[J].Materials Chemistry and Physics,2012,135(2/3):317-321.
[11]Ramasamy P,Chandra P,Rhee S W,et al.Enhanced upconversion luminescence in NaGdF4∶Yb,Er nanocrystals by Fe3+doping and their application in bioimaging[J].Nanoscale,2013,5(18):8711-8717.
[12]Mai H X,Zhang Y W,Sun L D,et al.Highly efficient multicolor up-conversion emissions and their mechanisms of monodisperse NaYF4∶Yb,Er core and core/shell-structured nanocrystals[J].Journal of Physical Chemistry C,2007,111(37):13721-13729.
[13]Amami J,Hreniak D,Guyot Y,et al.Size-effect on concentration quenching in Yb3+-doped Y3Al5O12 nano-crystals[J].Journal of Luminescence,2010,130(4):603-610.
[14]Huang Q,Yu J,Ma E.Synthesis and characterization of highly efficient near-infrared upconversion Sc3+/Er3+/Yb3+tridoped NaYF4[J].Journal of Physical Chemistry C,2010,114(10):4719-4724.
[15]Pollnau M,Gamelin D R,Lüthi S R,et al.Power dependence of upconversion luminescence in lanthanide and transitionmetal-ion systems[J].Physical Review B,2000,61(5):3337-3346.
[16]Zeng J H,Su J,Li Z H,et al.Synthesis and upconversion luminescence of hexagonal-phase NaYF4∶Yb,Er3+phosphors of controlled size and morphology[J].Advanced Materials,2005,17(17):2119-2123.
[17]Wang J,Wang F,Wang C,et al.Single-band upconversion emission in lanthanide-doped KMnF3 Nanocrystals[J].Angewandte Chemie International Edition,2011,50(44):10369-10372.
[18]Zeng J H,Xie T,Li Z H,et al.Monodispersed nanocrystalline fluoroperovskite up-conversion phosphors[J].Crystal Growth&Design,2007,7(12):2774-2777.
[19]Huang Z Y,Yi M J,Gao H P,et al.Enhancing single red band upconversion luminescence of KMnF3∶Yb3+/Er3+nanocrystals by Mg2+doping[J].Journal of Alloys and Compounds,2017,694:241-245.
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