Sr_2YF_7:Yb,Tm纳米晶的水热制备及上转换发光性能研究
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摘要
采用温和水热法制备了七氟钇锶(Sr_2YF_7):镱(Yb),铥(Tm)纳米晶(Sr2YF7∶Yb,Tm纳米晶),并对其微结构、形貌、粒径、发光性能进行了表征。结果显示,制备的Sr_2YF_7:Yb,Tm纳米晶为四方晶相结构,其形貌为类球型,平均粒径34nm;在980nm红外光激发下,其发射峰分别位于463nm、480nm、650nm处,I_蓝/I_红≈43,无紫外及红外发射峰出现,获得了上转换单色蓝光。依据发光强度与激发功率的关系,确定样品的蓝光与红光发射均为三光子过程,并分析了其上转换发光机制。
Sr_2YF_7:Yb,Tm nanocrystals were synthesized by a mild hydrothermal method.The microstructures,morphologies,particle sizes and luminescence properties of as-prepared nanocrystals were characterized.The results showed that as-prepared nanocrystals possessed pure tetragonal structure,spherical shape and average size of about 34 nm.Emissions centered at around 463,480 and 650 nm upon exciting with a 980 nm laser diode,I_(blue)/I_(red)≈43,No UV and IR peaks were detected,and the upconversion monochromatic blue light was observed.According to the relationship between luminescence intensity and excitation power,the blue and red upconversion luminescence of as-prepared products was come from three-photon energy transfer process,the upconversion mechanism was discussed in detail.
Sr_2YF_7:Yb,Tm nanocrystals were synthesized by a mild hydrothermal method.The microstructures,morphologies,particle sizes and luminescence properties of as-prepared nanocrystals were characterized.The results showed that as-prepared nanocrystals possessed pure tetragonal structure,spherical shape and average size of about 34 nm.Emissions centered at around 463,480 and 650 nm upon exciting with a 980 nm laser diode,I_(blue)/I_(red)≈43,No UV and IR peaks were detected,and the upconversion monochromatic blue light was observed.According to the relationship between luminescence intensity and excitation power,the blue and red upconversion luminescence of as-prepared products was come from three-photon energy transfer process,the upconversion mechanism was discussed in detail.
引文
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[26] 钟诚,蒋芸,赖欣,等.YF3∶Yb,Er,Tm纳米晶:低温固相制备及上转换发光性能[J].化工新型材料,2016,44(10):73-78.
[2] Xu W,Chen G,Peterson J R.Blue upconversion emission from a PbF2/GeO2/WO3glass doped with Tm3+or Tm3+/Tb3+ions[J].Journal of Solid State Chemistry,1995,115(1):71-75.
[3] Tsang W S,Yu W M,Mak C L,et al.Evidence of influence of phonon density on Tm3+upconversion luminescence in tellurite and germanate glasses[J].Journal of Applied Physics,2002,91(4):1871-1874.
[4] Kawamoto Y,Kitai Y,Tokura N,et al.Upconversion glass-ceramic devices of individual emission of red,green and blue and their applications[J].Proceedings of SPIE,2004,5350:269-280.
[5] 徐时清,黄俊,张丽艳,等.Yb3+敏化Tm3+掺杂氧卤碲酸盐玻璃的上转换发光研究[J].光学学报,2006,26(2):225-229.
[6] Liu Y S,Tu D T,Zhu H M,et al.Lanthanide-doped luminescent nano-bioprobes:from fundamentals to biodetection[J].Nanoscale,2013,5(4):1369-1384.
[7] Vetrone F,Mahalingam V,Capobianco J A.Near-infrared-toblue upconversion in colloidal BaYF5∶Tm3+,Yb3+nanocrystals[J].Chemistry of Materials,2009,21(9):1847-1851.
[8] De G J H,Qin W P,Wang W H,et al.Infrared-to-ultraviolet upconversion luminescence of La0.95 Yb0.49Tm0.01F3 nanostructures[J].Optics Communications,2009,282(14):2950-2953.
[9] Cao C Y,Qin W P,Zhang J S,et al.Enhanced ultraviolet upconversion emissions of Tm3+/Yb3+codoped YF3nanocrystals[J].Journal of Fluorine Chemistry,2008,129(3):204-209.
[10] Lei L,Chen D Q,Huang F,et al.Syntheses and optical properties of monodisperse BaLnF5(Ln=La-Lu,Y)nanocrystals[J].Journal of Alloys and Compounds,2012,540,27-31.
[11] Chuai X H,Zhang D S,Zhao D,et al.Synthesis and characterization of Yb3+,Tm3+∶Ba2YF7nanocrystalline with efficient upconversion fluorescence[J].Materials Letters,2011,65(15-16):2368-2370.
[12] Huang W J,Ding M Y,Huang H M,et al.Uniform NaYF4∶Yb,Tm hexagonal submicroplates:controlled synthesis and enhanced UV and blue upconversion luminescence[J].Materials Research Bulletin,2013,48(2):300-304.
[13] Wu Y,Li C X,Yang D M,et al.Rare earthβ-NaGdF4fluorides with multiform morphologies:hydrothermal synthesis and luminescent properties[J].Journal of Colloid and Interface Science,2011,354(2):429-436.
[14] Jiang T,Song W Y,Liu S S,et al.Synthesis and upconversion luminescence properties study of NaYbF4∶Tm3+crystals with different dopant concentration[J].Journal of Fluorine Chemistry,2012,140(140):70-75.
[15] Wawrzynczyk D,Nyk M,Bednarkiewicz A,et al.A comparison of morphology,structure and optical properties of ultrasmall,small and core-shell up-converting NaYF4/NaGdF4nanocrystals co-doped with Tm3+and Yb3+ions[J].Journal of Luminescence,2013,133,138-144.
[16] Pei X J,Hou Y B,Zhao S L,et al.Frequency upconversion of Tm3+and Yb3+codoped YLiF4synthesized by hydrothermal method[J].Materials Chemistry and Physics,2005,90(2-3):270-274.
[17] Balakrishnaiah R,Kim D W,Yi S S,et al.Infrared to UV,VIS and NIR frequency upconversion luminescence studies of Tm3+-doped YbLiF4 crystal[J].Optical Materials,2009,31(6):959-964.
[18] Chen W P,Hu F F,Wei R F,et al.Optical thermometry based on up-conversion luminescence of Tm3+doped transparent Sr2YF7 glass ceramics[J].Journal of Luminescence,2017,192,303-309.
[19] Ma M,Xu C F,Yang L W,et al.Solvothermal synthesis and tailored upconversion emission of monodisperse ultrasmall face-centered cubic Sr2YF7nanocrystals[J].Journal of Alloys and Compounds,2012,525,97-102.
[20] Zhao B,Shen D Y,Yang J,et al.Lanthanide-doped Sr2ScF7nanocrystals:controllable hydrothermal synthesis,the growth mechanism and tunable up/down conversion luminescence properties[J].Journal of Materials Chemistry C,2017,5(13):3264-3275.
[21] Xu C F,Ma M,Yang L W,et al.Lanthanide doping-facilitated growth of ultrasmall monodisperse Ba2LaF7 nanocrystals with excellent photoluminescence[J].Journal of Colloid and Interface Science,2012,368(1):49-55.
[22] Xia Z G,Du P,Liao L B.Facile hydrothermal synthesis and upconversion luminescence of tetragonal Sr2LnF7∶Yb3+/Er3+(Ln=Y,Gd)nanocrystals[J].Physica status solidi AApplications and Materials Science,2013,210(9):1734-1737.
[23] Yang Y H,Tu D T,Zheng W,et al.Lanthanide-doped Sr2YF7nanoparticles:controlled synthesis,optical spectroscopy and biodetection[J].Nanoscale,2014,6(19):11098-11105.
[24] Hu F F,Cao J K,Wei X T,et al.Luminescence properties of Er3+doped transparent NaYb2F7 glass-ceramics for optical thermometry and spectral conversion[J].Journal of Materials Chemistry C,2016,4(42):9976-9985.
[25] Yang K S,Li Y,Yu C Y,et al.Upconversion luminescence properties of Ho3+,Tm3+,Yb3+co-doped nanocrystal NaYF4synthesized by hydrothermal method[J].Journal of Rare Earths,2006,24(6):757-760.
[26] 钟诚,蒋芸,赖欣,等.YF3∶Yb,Er,Tm纳米晶:低温固相制备及上转换发光性能[J].化工新型材料,2016,44(10):73-78.
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