聚合物/LaF_3：Ln~（3+）复合纳米纤维的制备和上转换发光研究
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摘要
稀土发光材料,特别是以氟化物作为基质的纳米材料具有优良的上转换发光特性,在新光源、生物传感器、化学传感器、红外量子计数器等等领域有广泛的应用前景,已成为高科技领域中的研究热点。
本文以静电纺丝法成功制备了具有高上转换特性的复合纳米纤维,分别是PVP(聚乙烯吡咯烷烔）/ LaF3:Er3+复合纳米纤维和PPV(聚对苯乙炔)/ LaF3:Er3+,Yb3+复合纳米纤维。在纳米纤维的制备上,采用了共混纺丝的方法,即把制备好的纳米粒子混入最佳电纺浓度的聚合物溶液中,在常温下慢速率(每分钟50转左右)搅拌48h以上,充分混合均匀后静电纺丝。
本文借助于现代化的测试手段,如利用透射电子显微镜(TEM)、扫描电子显微镜(SEM)对聚合物/LaF3:Ln3+复合纳米纤维材料的形态做了分析;利用红外光谱(FT-IR)和X射线粉末衍射仪(XRD)等对聚合物/LaF3:Ln3+复合纳米纤维材料的成分、材料内部原子或分子的结构或形态进行了表征;测试了聚合物/LaF3:Ln3+复合纳米纤维材料的上转换发光(UC)性质并进行了分析讨论。
测试分析结果表明,复合纳米纤维的直径在200-400nm,LaF3:Ln3+纳米粒子的大小为40 nm左右,而且纳米粒子均匀分散在纳米纤维的内部和表面。用激发功率5mw、激发波长980nm的激光激发聚合物/LaF3:Ln3+复合纳米纤维,得到了高上转换发光,它的上转换发光强度与同等条件下激发LaF3:Ln3+纳米粒子的上转换发光强度相比,明显的增强。该结果还未见有文献报道,论文正在撰写之中。
Due to the great specific surface area, the surface energy and activity of nanoparticles increase.Therefore,the nanoparticles show many special chemical and physical (light, electricity, magnetism, heat, etc.) properties and a lot of scientists have been attracted by these characteristic. Because rare earth materials, especially their fluoride, have excellent luminescent properties and potential application in new photosource, bio-sensor, chemistry sensor, infrared quantum counter and so on, they have become a hot research field recently.
In this paper, composite nanofibers with high upconversion properties were successfully prepared by electrospinning method, such as PVP (polyvinylpyrrolidone)/LaF3:Er3+ and PPV (poly p-phenylene vinylene)/LaF3:Er3+,Yb3+ composite nanofibers. The manufacture steps were to blend the nanoparticles in polymer solution, then the mixed solution was stirred (the speed was about 50rpm) for 48h, finally electrospinning.
By using the transmission electron microscope (TEM) and the scanning electron microscope (SEM), we characterized the morphology of nanofibers and distribution of nanoparticle in polymer/LaF3:Ln3+ composite nanofibers. And by using fourier transform infrared spectroscopy (FT-IR) and X-ray powder diffraction (XRD) etc., we characterized chemical and crystal structure of polymer/LaF3:Ln3+ composite nanofibers. The upconversion (UC) properties of the polymer/LaF3:Ln3+ composite nanofibers were characterized and discussed.
The results showed that the average diameter of composite nanofibers was 200-400nm and the average diameter of LaF3:Ln3+ nanoparticles was about 40 nm. The nanoparticles were uniformly dispersed in the composite nanofibers. Under the excitation of a 980 nm laser, the polymer/LaF3:Ln3+ composite nanofibers had emitted a high upconversion luminescence, and the upconversion luminescence intensity was stronger than that of LaF3:Ln3+ nanoparticles. Up to now, we have not seen the report about the above results, and the paper is being written now.
本文以静电纺丝法成功制备了具有高上转换特性的复合纳米纤维,分别是PVP(聚乙烯吡咯烷烔）/ LaF3:Er3+复合纳米纤维和PPV(聚对苯乙炔)/ LaF3:Er3+,Yb3+复合纳米纤维。在纳米纤维的制备上,采用了共混纺丝的方法,即把制备好的纳米粒子混入最佳电纺浓度的聚合物溶液中,在常温下慢速率(每分钟50转左右)搅拌48h以上,充分混合均匀后静电纺丝。
本文借助于现代化的测试手段,如利用透射电子显微镜(TEM)、扫描电子显微镜(SEM)对聚合物/LaF3:Ln3+复合纳米纤维材料的形态做了分析;利用红外光谱(FT-IR)和X射线粉末衍射仪(XRD)等对聚合物/LaF3:Ln3+复合纳米纤维材料的成分、材料内部原子或分子的结构或形态进行了表征;测试了聚合物/LaF3:Ln3+复合纳米纤维材料的上转换发光(UC)性质并进行了分析讨论。
测试分析结果表明,复合纳米纤维的直径在200-400nm,LaF3:Ln3+纳米粒子的大小为40 nm左右,而且纳米粒子均匀分散在纳米纤维的内部和表面。用激发功率5mw、激发波长980nm的激光激发聚合物/LaF3:Ln3+复合纳米纤维,得到了高上转换发光,它的上转换发光强度与同等条件下激发LaF3:Ln3+纳米粒子的上转换发光强度相比,明显的增强。该结果还未见有文献报道,论文正在撰写之中。
Due to the great specific surface area, the surface energy and activity of nanoparticles increase.Therefore,the nanoparticles show many special chemical and physical (light, electricity, magnetism, heat, etc.) properties and a lot of scientists have been attracted by these characteristic. Because rare earth materials, especially their fluoride, have excellent luminescent properties and potential application in new photosource, bio-sensor, chemistry sensor, infrared quantum counter and so on, they have become a hot research field recently.
In this paper, composite nanofibers with high upconversion properties were successfully prepared by electrospinning method, such as PVP (polyvinylpyrrolidone)/LaF3:Er3+ and PPV (poly p-phenylene vinylene)/LaF3:Er3+,Yb3+ composite nanofibers. The manufacture steps were to blend the nanoparticles in polymer solution, then the mixed solution was stirred (the speed was about 50rpm) for 48h, finally electrospinning.
By using the transmission electron microscope (TEM) and the scanning electron microscope (SEM), we characterized the morphology of nanofibers and distribution of nanoparticle in polymer/LaF3:Ln3+ composite nanofibers. And by using fourier transform infrared spectroscopy (FT-IR) and X-ray powder diffraction (XRD) etc., we characterized chemical and crystal structure of polymer/LaF3:Ln3+ composite nanofibers. The upconversion (UC) properties of the polymer/LaF3:Ln3+ composite nanofibers were characterized and discussed.
The results showed that the average diameter of composite nanofibers was 200-400nm and the average diameter of LaF3:Ln3+ nanoparticles was about 40 nm. The nanoparticles were uniformly dispersed in the composite nanofibers. Under the excitation of a 980 nm laser, the polymer/LaF3:Ln3+ composite nanofibers had emitted a high upconversion luminescence, and the upconversion luminescence intensity was stronger than that of LaF3:Ln3+ nanoparticles. Up to now, we have not seen the report about the above results, and the paper is being written now.
引文
[1] Woggon U.Optical Properties of Semiconductor Quantum Dots [M].Berlin Springer:1997.
[2] Artemyev M V,Sperling V,Woggon U.Electroluminescence in Thin Solid Films of Closely-packed CdS Nanocrystals [J].Journal of Crystal Growth,1998,184/185:374-376.
[3]陈津,魏丽乔,许并存等.纳米非金属功能材料[M].北京:化学工业出版社,2007.
[4]崔启征,董相廷,于伟利.静电纺丝技术制备无机物纳米纤维的最新研究进展[J].稀有金属材料与工程,2006,35(7):l167-ll71.
[5] Vonnegut B , Neubauer R L . Production of monodisperse liquid particles by electrical atomization[J].J of Colloid Science,1952,7:616-622.
[6]孙家跃,杜海燕.固体发光材料[M].北京:化学工业出版社,2003.
[7]徐东勇,臧竞存.上转换激光和上转换发光材料的研究进展[J].人工晶体学报,2001,30(2):203-210.
[8] Joubert Marie-France.Photon avalanche upconversion in rare earth laser materials[J].Optical Materials,1999,11:181-203.
[9] Scheps R.Upconversion laser processes[J].Progress In Quantum Electronics,1996,20:271-358.
[10] Bloembergen N.Solid State Infrared Quantum Counters[J].Phys. Rev. Lett.,1959,2:84-86.
[11] Auzel F,Upconversion and Anti-Stokes Processes with f and d Ions in Solids[J].Chem. Rev.,2004,104 (1):139–174.
[12] Stephens R R,McFarlane R A.Diode-pumped upconversion laser with 100-mW output power[J].Opt. Lett.,1993,18(1):34-36.
[13] Heine F,Heumann E,Danger T,et al.Green upconversion continuous wave Er3+:LiYF4 laser at room temperature[J].Appl. Phys. Lett.,1994,65(4):383-384.
[14] Wang F,Liu X G. Recent advances in the chemistry of lanthanide-doped upconversion nanocrystals[J].Chem. Soc. Rev.,2009,38:976-989.
[15] Chivian J S,Case W E,Eden D D.The photon avalanche: A new phenomenon in Pr3+-based infrared quantum counters[J].Appl. Phys. Lett.,1979,35:124-126.
[16]杨建虎,戴世勋,姜中宏.稀土离子的上转换发光及研究进展[J].物理学进展,2003,23(3):284-298.
[17]何广海.氟氧玻璃上转换发光材料的制备与表征[D].长春理工大学,2006.
[18]于辉,尚庆坤,王红丹.纳米TiO2基质掺杂稀土离子Er3+和Yb3+的上转换发光特性[J].分子科学学报,2007,23(2):119-112.
[19]苏锵.稀土化学[M].郑州:河南科技出版社,1993.
[20]陈占恒.稀土新材料及其在高技术领域的应用[J].稀土,2000,21(1):53-57.
[21]燕来,赵永亮,安晓萍.稀土配合物发光材料的研究及应用[J].内蒙古石油化工,2002,28:5-8.
[22] Zhao L J,Yang H,Yu L X,et al.Study on magnetic properties of nanocrystalline La-,Nd-,or Gd-substituted Ni-Mn ferrite at low temperatures[J].J. Magn. Magn. Mater.,2006,305:91-94.
[23] Zhuang J,Chen X P,Chi Y H.Acta. Chim. Sinica.,2006, 64:151 (in Chinese).
[24]汪玉芳,刘玲霞,胡宏祥.稀土发光材料的合成与发展[J].浙江化工,2005,36(9):28-29.
[25] Bai Z H,Cheng J,Zhang X Y.Preparation and Characterization Upconversion Luminescence Material of Yttrium Aluminate Doped with Rare Earth[J].Journal of Rare Earths,2007,25(1):129-133.
[26] Marie-France Joubert.Photon avalanche upconversion in rare earth laser materials[J].Optical Materials,1999,11(2):181-203.
[27] Pang T,Cao W H,Xing M M.Blue and white upconversion emissions of rare-earth ions-doped oxyfluoride phosphors[J].Physica B: Condensed Matter,2010 Inpress.
[28] Daniel R,Gamelin,Hans U Güdel.Design of Luminescent Inorganic Materials: New Photophysical Processes Studied by Optical Spectroscopy[J].Acc. Chem. Res.,2000,33 (4):235–242.
[29] Radiy R Islangulov, Felix N Castellano.Photochemical Upconversion: Anthracene Dimerization Sensitized to Visible Light by a RuII Chromophore[J].Angew. Chem. Int. Ed., 2006,45:5957–5959.
[30]何捍卫,周科朝,熊翔,等.红外-可见光的上转换材料研究进展[J].中国稀土学报,2003,21:123-127.
[31] Downing E,Hesselink L,Ralston J,et al.A Three-Color, Solid-State, Three-Dimensional Display[J].Science,1996,273:1185-1189.
[32] Yi G S,Lu H C,Zhao S Y,et al.Synthesis, Characterization, and Biological Application of Size-Controlled Nanocrystalline NaYF4:Yb,Er Infrared-to-Visible Up-Conversion Phosphors[J]. Nano Letters,2004,4:2191-2196.
[33] Rijke F van de,Zijlmans H,Li S,et al.Up-converting phosphor reporters for nucleic acid microarrays[J].Nature Biotechnology,2001,19:273-276.
[34] Brede R,Heumann E,Koetke J,et al.Green up-conversion laser emission in Er-doped crystals at room temperature[J].Applied Physics Letters,1993,63:2030-2031.
[35] Heumann E,Bar S,Kretschmann H,et al.Diode-pumped continuous-wave green upconversion lasing of Er3+:LiLuF4 using multipass pumping[J].Optics Letters,2002,27:1699-1701.
[36] Osiac E,Kuck S,Heumann E,et al.Spectroscopic characterisation of the upconversion avalanche mechanism in Pr3+,Yb3+:BaY2F8[J].Optical Materials,2003,24:537-545.
[37]钟智丽,王训该.纳米纤维的应用前景[J].纺织学报,2006,27(1):107-110.
[38] Formhals A.US Patent,1934,504: 1975.
[39] Pattamaprom C,Hongrojjanawiwat W,Koombhongse P,et al.The influence of solvent properties and functionality on the electrospinnablility of polystyrene nano-fibers[J].Macromol Mater & Eng,2006,291(7): 840-847
[40] Ohkawa K,Cha D L,Kim H Y,et a1.Electmspinning of chitosa[J].Macromol Rapid Commun,2004,25:1600-1605.
[41] Wang L,Li C M,Ryan A J,et al.Synthesis and peptide-induced degradation of biocompatible fibers based on highly branched poly(2-hydroxyethyl methacrylate)[J].Adv Mater,2006,18(12):1566-1570.
[42] Koski A,Yim K,Shivkumar S.Effect of molecular weight Oll fibrous PVA produced by electrospinning[J].Materials Letters,2004,58:493-497.
[43] Liu H Q,Heieh Y L.Ultrafine fibrous cellulose membranes from electrospinning of cellulose acetate[J].J of Polymer Sci Part B:Polymer Physics,2002,40:2119-2129.
[44] Shin Y M,Hohman M M,Brenner M P,et al.Experimental characterization of eleetrospinning: the electrically forced jet and instabilities[J].Polymer,2001,42:09955-09967.
[45] Jansuwannspoom T,Hongojianawiwat W.Effect of solvents oil electrespinnability of polystyrene solution and morphological appearance of resulting electrespun polystyrene solution and morphological appearane of resulting electrespun polystyrene fibers[J].Euro Polymer J,2005 ,41:409-421.
[46] Buchko C J,Chen L C,Shen Y,et al.Processing and microstructural characterization of porous biocompatible protein polymer thin films[J].Polymer,1999,40(26):7397-7407.
[47] Trzaskoma-Paulette P P,Nazeri A.Effects of sol-gel coatings on the localized corrosion behavior of 304 stainless steel [J].J Electrochem Soc,1997,144(4):1307-1310.
[48] Krauthauser C,Deitzel J M,O'Brien D,et al.Optical Properties of Transparent Resins with Electrospun Polymer Nanofibers[J].Polymeric Nanofibers,2006,25:353-369.
[49] Frenot A,Chronakis I S.Polymer nanofibers assembled by electrospinning [J].Curr Opin Colloid Interface Sci,2003,8(1):64-75.
[50] Deitzel J M,Krauthauser C,Harris D,et al.Key Parameters Influencing the Onset and Maintenance of the Electrospinning Jet[J].Polymeric Nanofibers,2006,5:56-73.
[51] Ross-Se.Electrospinning The Quest for Nanofibers International Fiber Journal [R].2001,16(5):50-53.
[1] Lauhon L J,Gudiksen M S,Wang D,et al.Epitaxial core–shell and core–multishell nanowire heterostructures[J].Nature,2002,420:57-61.
[2] Hu J,Odom T W,Lieber C M.Chemical Thermodynamics of the Size and Shape of Strained Ge Nanocrystals Grown on Si(001)[J].Acc. Chem. Res.,1999,32:435-433.
[3] Xia Y,Yang P,Sun Y,et al.One-Dimensional Nanostructures: Synthesis, Characterization, and Applications[J].AdV. Mater.,2003,15:353-389.
[4] Heath J R,Kuekes P J,Williams R S.Effect of Substrate Strain on Adsorption[J].Science,1998,280:717.
[5] Hu J T,Ouyang M,Yang P D,et al.Controlled growth and electrical properties of heterojunctions of carbon nanotubes and silicon nanowires[J].Nature,1999,399:48-51.
[6] Xu D S,Guo G L,Gui L L,et al.Controlling growth and field emission property of aligned carbon nanotubes on porous silicon substrates[J].Appl. Phys. Lett.,1999,75:481-483.
[7] Sui X M,Shao C L,Liu C Y.White-light emission of polyvinyl alcohol?ZnO hybrid nanofibers prepared by electrospinning[J].Appl. Phys. Lett.,2005,87:113-115.
[8] Zhang J,Hong G J.Synthesis and photoluminescence of the Y2O3:Eu3+ phosphor nanowires in AAO template[J].J. Solid State Chem.,2004,177:1292-1296.
[9] Song H W,Yu L X,Lu S Z,et al.Remarkable differences in photoluminescent properties between LaPO4:Eu one-dimensional nanowires and zero-dimensional nanoparticles[J].Appl. Phys. Lett.,2004,85:470-472.
[10] Wu C F,Qin W P,Qin G S,et al.Photoluminescence from surfactant-assembled Y2O3:Eu nanotubes[J].Appl. Phys. Lett.,2003,82:520-522.
[11] Bognitzki M,Czado W,Frese T,et al.Nanostructured Fibers via Electrospinning[J].Adv. Mater.,2001,13:70-72.
[12] Larsen G,Velarde-Ortiz R,Minchow K,et al.A Method for Making Inorganic and Hybrid (Organic/Inorganic) Fibers and Vesicles with Diameters in the Submicrometer and Micrometer Range via Sol?Gel Chemistry and Electrically Forced Liquid Jets[J].J. Am. Chem. Soc.,2003,125:1154-1155.
[13] Ge J J,Hou H,Li Q,et al.Assembly of Well-Aligned Multiwalled Carbon Nanotubes in Confined Polyacrylonitrile Environments: Electrospun Composite Nanofiber Sheets[J].J. Am. Chem. Soc.,2004,126:15754-15761.
[14] Wang X Y,Drew C,Lee S H,et al.Electrospun Nanofibrous Membranes for Highly Sensitive Optical Sensors[J].Nano. Lett.,2002,2:1273-1275.
[15] Zong X H,Ran S F,Kim K S,et al.Structure and Morphology Changes during in Vitro Degradation of Electrospun Poly(glycolide-co-lactide) Nanofiber Membrane[J].Biomacromolecules,2003,4:416-423.
[16] Deitzel J M,Kleinmeye J,Harris D,et al.The effect of processing variables on the morphology of electrospun nanofibers an dtextiles[J].Polymer,2001,42:261-272.
[17]严瑞瑄.水溶性高分子[M].北京:化学工业出版社,1998.
[18] Li Z Q,Zhang Y.An efficient and user-friendly method for the synthesis of hexagonal-phase NaYF4:Yb, Er/Tm nanocrystals with controllable shape and upconversion fluorescence[J].Nanotechnology,2008,19:345606-5.
[19] Wang W L,Xu J W,Lai Y H,et al.Alternating aromatic and transannular chromophores with and without linker: effect of transannular - interaction on the optical property of dithiaparacyclophane-based copolymers [J].Macromolecules,2004,37(10):3546-3553.
[20] Akcelrud L.Electroluminescent polymers [J].Prog Polym Sci,2003,28(6):875-962.
[21] Liu C H,Chen D P.Controlled synthesis of hexagon shaped lanthanide-doped LaF3 nanoplates with multicolor upconversion fluorescence[J].Journal of Materials Chemistry,2007,17,(37):3875-3880.
[22] Liu C H,Sun J,Wang H,et al.Size and morphology controllable synthesis of oil-dispersible LaF3 : Yb,Er upconversion fluorescent nanocrystals via a solid-liquid two-phase approach[J].Scripta Materialia,2008,58,(2):89-92.
[1]张立德,牟季美.纳米材料和纳米结构[M].北京:科学出版社,2001.
[2]柯扬船,(美)皮特·斯壮.聚合物-无机纳米复合材料[M].北京:化学工业出版社,2003.
[3] Li Q,Li T,Wu J.Luminescence of Europium(III) and Terbium(III) Complexes Incorporated in Poly(Vinyl Pyrrolidone) Matrix[J].J Phys Chem B,2001,105:12293-12296.
[4] Burroughes J H,Bradley D D C,Brown A R,et al.Light-emitting diodes based on conjugated polymers[J].Nature,1990,347:539-541.
[5] Pope M,Kallmann H P,Magnante P.Electroluminescence in Organic Crystals[J].J Chem Phys,1963,38:2042-2043.
[6] Francesco Babudri,Gianluca M Farinola,Linda C Lopez,et al.A Synthetic Strategy Leading to Monodisperse PPV Oligomers by Coupling Reactions of Vinyltrimethylsilanes[J].J Org Chem,2001,66:3878-3885.
[7] Huang Z M,Zhang Y Z,Kotaki M,et al.A review on polymer nanofibers by electrospinning and their applications in nanocomposites [J].Compos Science Technol,2003,63:2223-2253.
[8] Wang G F,Qin W P,Wang L L,et al.Synthesis and upconversion luminescence properties of NaYF4:Yb3+/Er3+ microspheres[J].Journal of Rare Earths,2009,27:394-397.
[9] Yang K S , Zheng F , Wu R N , et al . Upconversion Luminescent Properties of YVO4:Yb3+,Er3+Nano-Powder by Sol-Gel Method[J].Journal of Rare Earths,2006,24:162-166.
[10] Garc?a-Revilla S,Valiente R,Romanyuk Y E,et al.Temporal dynamics of upconversion luminescence in Er3+,Yb3+ co-doped crystalline KY(WO4)2 thin films[J].Journal of Luminescence,2008,128:934-936.
[11] Yang J,zhang C M,Peng C,et al.Controllable Red, Green, Blue (RGB) and Bright White Upconversion Luminescence of Lu2O3:Yb3+/Er3+/Tm3+ Nanocrystals through Single Laser Excitation at 980 nm[J].Chemistry - A European Journal, 2009,15:4649-4655.
[12] Guo H,Li Z Q,Qian H S,et al.Seed-mediated synthesis of NaYF4:Yb, Er/NaGdF4 nanocrystals with improved upconversion fluorescence and MR relaxivity[J].Nanotechnology, 2010,21:125602-6.
[13] Li Z Q,Zhang Y.An efficient and user-friendly method for the synthesis of hexagonal-phase NaYF4:Yb, Er/Tm nanocrystals with controllable shape and upconversion fluorescence[J].Nanotechnology,2008,19:345606-5.
[14] Wang C,Tong Y B,Sun Z Y,et al.Preparation of one-dimensional TiO2 nanoparticles within polymer fiber matrices by electrospinning[J].Materials Letters,2007,61:5125-5128.
[15] Auzel F E.Materials and devices using double-pumped-phosphors with energy transfer[J]. Proceedings of the IEEE,1973,61:758-786.
[2] Artemyev M V,Sperling V,Woggon U.Electroluminescence in Thin Solid Films of Closely-packed CdS Nanocrystals [J].Journal of Crystal Growth,1998,184/185:374-376.
[3]陈津,魏丽乔,许并存等.纳米非金属功能材料[M].北京:化学工业出版社,2007.
[4]崔启征,董相廷,于伟利.静电纺丝技术制备无机物纳米纤维的最新研究进展[J].稀有金属材料与工程,2006,35(7):l167-ll71.
[5] Vonnegut B , Neubauer R L . Production of monodisperse liquid particles by electrical atomization[J].J of Colloid Science,1952,7:616-622.
[6]孙家跃,杜海燕.固体发光材料[M].北京:化学工业出版社,2003.
[7]徐东勇,臧竞存.上转换激光和上转换发光材料的研究进展[J].人工晶体学报,2001,30(2):203-210.
[8] Joubert Marie-France.Photon avalanche upconversion in rare earth laser materials[J].Optical Materials,1999,11:181-203.
[9] Scheps R.Upconversion laser processes[J].Progress In Quantum Electronics,1996,20:271-358.
[10] Bloembergen N.Solid State Infrared Quantum Counters[J].Phys. Rev. Lett.,1959,2:84-86.
[11] Auzel F,Upconversion and Anti-Stokes Processes with f and d Ions in Solids[J].Chem. Rev.,2004,104 (1):139–174.
[12] Stephens R R,McFarlane R A.Diode-pumped upconversion laser with 100-mW output power[J].Opt. Lett.,1993,18(1):34-36.
[13] Heine F,Heumann E,Danger T,et al.Green upconversion continuous wave Er3+:LiYF4 laser at room temperature[J].Appl. Phys. Lett.,1994,65(4):383-384.
[14] Wang F,Liu X G. Recent advances in the chemistry of lanthanide-doped upconversion nanocrystals[J].Chem. Soc. Rev.,2009,38:976-989.
[15] Chivian J S,Case W E,Eden D D.The photon avalanche: A new phenomenon in Pr3+-based infrared quantum counters[J].Appl. Phys. Lett.,1979,35:124-126.
[16]杨建虎,戴世勋,姜中宏.稀土离子的上转换发光及研究进展[J].物理学进展,2003,23(3):284-298.
[17]何广海.氟氧玻璃上转换发光材料的制备与表征[D].长春理工大学,2006.
[18]于辉,尚庆坤,王红丹.纳米TiO2基质掺杂稀土离子Er3+和Yb3+的上转换发光特性[J].分子科学学报,2007,23(2):119-112.
[19]苏锵.稀土化学[M].郑州:河南科技出版社,1993.
[20]陈占恒.稀土新材料及其在高技术领域的应用[J].稀土,2000,21(1):53-57.
[21]燕来,赵永亮,安晓萍.稀土配合物发光材料的研究及应用[J].内蒙古石油化工,2002,28:5-8.
[22] Zhao L J,Yang H,Yu L X,et al.Study on magnetic properties of nanocrystalline La-,Nd-,or Gd-substituted Ni-Mn ferrite at low temperatures[J].J. Magn. Magn. Mater.,2006,305:91-94.
[23] Zhuang J,Chen X P,Chi Y H.Acta. Chim. Sinica.,2006, 64:151 (in Chinese).
[24]汪玉芳,刘玲霞,胡宏祥.稀土发光材料的合成与发展[J].浙江化工,2005,36(9):28-29.
[25] Bai Z H,Cheng J,Zhang X Y.Preparation and Characterization Upconversion Luminescence Material of Yttrium Aluminate Doped with Rare Earth[J].Journal of Rare Earths,2007,25(1):129-133.
[26] Marie-France Joubert.Photon avalanche upconversion in rare earth laser materials[J].Optical Materials,1999,11(2):181-203.
[27] Pang T,Cao W H,Xing M M.Blue and white upconversion emissions of rare-earth ions-doped oxyfluoride phosphors[J].Physica B: Condensed Matter,2010 Inpress.
[28] Daniel R,Gamelin,Hans U Güdel.Design of Luminescent Inorganic Materials: New Photophysical Processes Studied by Optical Spectroscopy[J].Acc. Chem. Res.,2000,33 (4):235–242.
[29] Radiy R Islangulov, Felix N Castellano.Photochemical Upconversion: Anthracene Dimerization Sensitized to Visible Light by a RuII Chromophore[J].Angew. Chem. Int. Ed., 2006,45:5957–5959.
[30]何捍卫,周科朝,熊翔,等.红外-可见光的上转换材料研究进展[J].中国稀土学报,2003,21:123-127.
[31] Downing E,Hesselink L,Ralston J,et al.A Three-Color, Solid-State, Three-Dimensional Display[J].Science,1996,273:1185-1189.
[32] Yi G S,Lu H C,Zhao S Y,et al.Synthesis, Characterization, and Biological Application of Size-Controlled Nanocrystalline NaYF4:Yb,Er Infrared-to-Visible Up-Conversion Phosphors[J]. Nano Letters,2004,4:2191-2196.
[33] Rijke F van de,Zijlmans H,Li S,et al.Up-converting phosphor reporters for nucleic acid microarrays[J].Nature Biotechnology,2001,19:273-276.
[34] Brede R,Heumann E,Koetke J,et al.Green up-conversion laser emission in Er-doped crystals at room temperature[J].Applied Physics Letters,1993,63:2030-2031.
[35] Heumann E,Bar S,Kretschmann H,et al.Diode-pumped continuous-wave green upconversion lasing of Er3+:LiLuF4 using multipass pumping[J].Optics Letters,2002,27:1699-1701.
[36] Osiac E,Kuck S,Heumann E,et al.Spectroscopic characterisation of the upconversion avalanche mechanism in Pr3+,Yb3+:BaY2F8[J].Optical Materials,2003,24:537-545.
[37]钟智丽,王训该.纳米纤维的应用前景[J].纺织学报,2006,27(1):107-110.
[38] Formhals A.US Patent,1934,504: 1975.
[39] Pattamaprom C,Hongrojjanawiwat W,Koombhongse P,et al.The influence of solvent properties and functionality on the electrospinnablility of polystyrene nano-fibers[J].Macromol Mater & Eng,2006,291(7): 840-847
[40] Ohkawa K,Cha D L,Kim H Y,et a1.Electmspinning of chitosa[J].Macromol Rapid Commun,2004,25:1600-1605.
[41] Wang L,Li C M,Ryan A J,et al.Synthesis and peptide-induced degradation of biocompatible fibers based on highly branched poly(2-hydroxyethyl methacrylate)[J].Adv Mater,2006,18(12):1566-1570.
[42] Koski A,Yim K,Shivkumar S.Effect of molecular weight Oll fibrous PVA produced by electrospinning[J].Materials Letters,2004,58:493-497.
[43] Liu H Q,Heieh Y L.Ultrafine fibrous cellulose membranes from electrospinning of cellulose acetate[J].J of Polymer Sci Part B:Polymer Physics,2002,40:2119-2129.
[44] Shin Y M,Hohman M M,Brenner M P,et al.Experimental characterization of eleetrospinning: the electrically forced jet and instabilities[J].Polymer,2001,42:09955-09967.
[45] Jansuwannspoom T,Hongojianawiwat W.Effect of solvents oil electrespinnability of polystyrene solution and morphological appearance of resulting electrespun polystyrene solution and morphological appearane of resulting electrespun polystyrene fibers[J].Euro Polymer J,2005 ,41:409-421.
[46] Buchko C J,Chen L C,Shen Y,et al.Processing and microstructural characterization of porous biocompatible protein polymer thin films[J].Polymer,1999,40(26):7397-7407.
[47] Trzaskoma-Paulette P P,Nazeri A.Effects of sol-gel coatings on the localized corrosion behavior of 304 stainless steel [J].J Electrochem Soc,1997,144(4):1307-1310.
[48] Krauthauser C,Deitzel J M,O'Brien D,et al.Optical Properties of Transparent Resins with Electrospun Polymer Nanofibers[J].Polymeric Nanofibers,2006,25:353-369.
[49] Frenot A,Chronakis I S.Polymer nanofibers assembled by electrospinning [J].Curr Opin Colloid Interface Sci,2003,8(1):64-75.
[50] Deitzel J M,Krauthauser C,Harris D,et al.Key Parameters Influencing the Onset and Maintenance of the Electrospinning Jet[J].Polymeric Nanofibers,2006,5:56-73.
[51] Ross-Se.Electrospinning The Quest for Nanofibers International Fiber Journal [R].2001,16(5):50-53.
[1] Lauhon L J,Gudiksen M S,Wang D,et al.Epitaxial core–shell and core–multishell nanowire heterostructures[J].Nature,2002,420:57-61.
[2] Hu J,Odom T W,Lieber C M.Chemical Thermodynamics of the Size and Shape of Strained Ge Nanocrystals Grown on Si(001)[J].Acc. Chem. Res.,1999,32:435-433.
[3] Xia Y,Yang P,Sun Y,et al.One-Dimensional Nanostructures: Synthesis, Characterization, and Applications[J].AdV. Mater.,2003,15:353-389.
[4] Heath J R,Kuekes P J,Williams R S.Effect of Substrate Strain on Adsorption[J].Science,1998,280:717.
[5] Hu J T,Ouyang M,Yang P D,et al.Controlled growth and electrical properties of heterojunctions of carbon nanotubes and silicon nanowires[J].Nature,1999,399:48-51.
[6] Xu D S,Guo G L,Gui L L,et al.Controlling growth and field emission property of aligned carbon nanotubes on porous silicon substrates[J].Appl. Phys. Lett.,1999,75:481-483.
[7] Sui X M,Shao C L,Liu C Y.White-light emission of polyvinyl alcohol?ZnO hybrid nanofibers prepared by electrospinning[J].Appl. Phys. Lett.,2005,87:113-115.
[8] Zhang J,Hong G J.Synthesis and photoluminescence of the Y2O3:Eu3+ phosphor nanowires in AAO template[J].J. Solid State Chem.,2004,177:1292-1296.
[9] Song H W,Yu L X,Lu S Z,et al.Remarkable differences in photoluminescent properties between LaPO4:Eu one-dimensional nanowires and zero-dimensional nanoparticles[J].Appl. Phys. Lett.,2004,85:470-472.
[10] Wu C F,Qin W P,Qin G S,et al.Photoluminescence from surfactant-assembled Y2O3:Eu nanotubes[J].Appl. Phys. Lett.,2003,82:520-522.
[11] Bognitzki M,Czado W,Frese T,et al.Nanostructured Fibers via Electrospinning[J].Adv. Mater.,2001,13:70-72.
[12] Larsen G,Velarde-Ortiz R,Minchow K,et al.A Method for Making Inorganic and Hybrid (Organic/Inorganic) Fibers and Vesicles with Diameters in the Submicrometer and Micrometer Range via Sol?Gel Chemistry and Electrically Forced Liquid Jets[J].J. Am. Chem. Soc.,2003,125:1154-1155.
[13] Ge J J,Hou H,Li Q,et al.Assembly of Well-Aligned Multiwalled Carbon Nanotubes in Confined Polyacrylonitrile Environments: Electrospun Composite Nanofiber Sheets[J].J. Am. Chem. Soc.,2004,126:15754-15761.
[14] Wang X Y,Drew C,Lee S H,et al.Electrospun Nanofibrous Membranes for Highly Sensitive Optical Sensors[J].Nano. Lett.,2002,2:1273-1275.
[15] Zong X H,Ran S F,Kim K S,et al.Structure and Morphology Changes during in Vitro Degradation of Electrospun Poly(glycolide-co-lactide) Nanofiber Membrane[J].Biomacromolecules,2003,4:416-423.
[16] Deitzel J M,Kleinmeye J,Harris D,et al.The effect of processing variables on the morphology of electrospun nanofibers an dtextiles[J].Polymer,2001,42:261-272.
[17]严瑞瑄.水溶性高分子[M].北京:化学工业出版社,1998.
[18] Li Z Q,Zhang Y.An efficient and user-friendly method for the synthesis of hexagonal-phase NaYF4:Yb, Er/Tm nanocrystals with controllable shape and upconversion fluorescence[J].Nanotechnology,2008,19:345606-5.
[19] Wang W L,Xu J W,Lai Y H,et al.Alternating aromatic and transannular chromophores with and without linker: effect of transannular - interaction on the optical property of dithiaparacyclophane-based copolymers [J].Macromolecules,2004,37(10):3546-3553.
[20] Akcelrud L.Electroluminescent polymers [J].Prog Polym Sci,2003,28(6):875-962.
[21] Liu C H,Chen D P.Controlled synthesis of hexagon shaped lanthanide-doped LaF3 nanoplates with multicolor upconversion fluorescence[J].Journal of Materials Chemistry,2007,17,(37):3875-3880.
[22] Liu C H,Sun J,Wang H,et al.Size and morphology controllable synthesis of oil-dispersible LaF3 : Yb,Er upconversion fluorescent nanocrystals via a solid-liquid two-phase approach[J].Scripta Materialia,2008,58,(2):89-92.
[1]张立德,牟季美.纳米材料和纳米结构[M].北京:科学出版社,2001.
[2]柯扬船,(美)皮特·斯壮.聚合物-无机纳米复合材料[M].北京:化学工业出版社,2003.
[3] Li Q,Li T,Wu J.Luminescence of Europium(III) and Terbium(III) Complexes Incorporated in Poly(Vinyl Pyrrolidone) Matrix[J].J Phys Chem B,2001,105:12293-12296.
[4] Burroughes J H,Bradley D D C,Brown A R,et al.Light-emitting diodes based on conjugated polymers[J].Nature,1990,347:539-541.
[5] Pope M,Kallmann H P,Magnante P.Electroluminescence in Organic Crystals[J].J Chem Phys,1963,38:2042-2043.
[6] Francesco Babudri,Gianluca M Farinola,Linda C Lopez,et al.A Synthetic Strategy Leading to Monodisperse PPV Oligomers by Coupling Reactions of Vinyltrimethylsilanes[J].J Org Chem,2001,66:3878-3885.
[7] Huang Z M,Zhang Y Z,Kotaki M,et al.A review on polymer nanofibers by electrospinning and their applications in nanocomposites [J].Compos Science Technol,2003,63:2223-2253.
[8] Wang G F,Qin W P,Wang L L,et al.Synthesis and upconversion luminescence properties of NaYF4:Yb3+/Er3+ microspheres[J].Journal of Rare Earths,2009,27:394-397.
[9] Yang K S , Zheng F , Wu R N , et al . Upconversion Luminescent Properties of YVO4:Yb3+,Er3+Nano-Powder by Sol-Gel Method[J].Journal of Rare Earths,2006,24:162-166.
[10] Garc?a-Revilla S,Valiente R,Romanyuk Y E,et al.Temporal dynamics of upconversion luminescence in Er3+,Yb3+ co-doped crystalline KY(WO4)2 thin films[J].Journal of Luminescence,2008,128:934-936.
[11] Yang J,zhang C M,Peng C,et al.Controllable Red, Green, Blue (RGB) and Bright White Upconversion Luminescence of Lu2O3:Yb3+/Er3+/Tm3+ Nanocrystals through Single Laser Excitation at 980 nm[J].Chemistry - A European Journal, 2009,15:4649-4655.
[12] Guo H,Li Z Q,Qian H S,et al.Seed-mediated synthesis of NaYF4:Yb, Er/NaGdF4 nanocrystals with improved upconversion fluorescence and MR relaxivity[J].Nanotechnology, 2010,21:125602-6.
[13] Li Z Q,Zhang Y.An efficient and user-friendly method for the synthesis of hexagonal-phase NaYF4:Yb, Er/Tm nanocrystals with controllable shape and upconversion fluorescence[J].Nanotechnology,2008,19:345606-5.
[14] Wang C,Tong Y B,Sun Z Y,et al.Preparation of one-dimensional TiO2 nanoparticles within polymer fiber matrices by electrospinning[J].Materials Letters,2007,61:5125-5128.
[15] Auzel F E.Materials and devices using double-pumped-phosphors with energy transfer[J]. Proceedings of the IEEE,1973,61:758-786.