研究α-NaYF4:Yb,Er上转换纳米粒子的W/O微乳液溶剂热制备,并用正硅酸乙酯为SiO2前驱体对NaYF4:Yb,Er上转换纳米粒子进行SiO2包覆,分析SiO2包覆对Er3+发光增强作用来自于两方面.包覆弥补上转换纳米粒子表面的发光粹灭中心,提高上转换发光强度.同时由于Si-O-Si的对称振动能量1 106 cm-1与4F7/2能级到2H11/2能级弛豫能量1 177cm-1相当,(CH2)n的红外振动模能量为743 cm-1与2H11/2能级到4S3/2弛豫能量780 cm-1相当,4F7/2能级到4F9/2弛豫能量为5 023 cm-1,4I11/2能级到4I13/2弛豫能量接近4 500 cm-1与Si-O-Si的对称伸缩振动能量1 106 cm-1不匹配,所以SiO2包覆能有效的增加表面发光中心2H11/2,4S3/2能级布居数,而使得产生红光发射的能级4F9/2能级布居数不变.
参考文献
| [1] | Tropper A C;Carter J N;Lader R D T .Analysis of blue and red laser performance of the infrared-pumped praseodymiumdoped fluoride fiber laser[J].Journal of the Optical Society of America B:Optical Crystal Physics,1994,11:886-893. |
| [2] | Page RH.;Waide PA.;Tassano JB.;Payne SA.;Krupke WF. Bischel WK.;Schaffers KI. .Upconversion-pumped luminescence efficiency of rare-earth-doped hosts sensitized with trivalent ytterbium[J].Journal of the Optical Society of America, B. Optical Physics,1998(3):996-1008. |
| [3] | Magali Boutonnet;Jerzy Kizling;Per Stenius;Gilbert Maire.The preparation of monodisperse colloidal metal particles from microemulsions[J].Colloids and Surfaces,1982(05):209-225. |
| [4] | 连洪洲,石春山.用于纳米粒子合成的微乳液[J].化学通报,2004(05):333-340,348. |
| [5] | Lisiecki I;Pileni M P .Synthesis of copper metallic clusters using reverse micelles as microreactors[J].Journal of the American Chemical Society,1993,115:3887-3896. |
| [6] | Liang Lifang;Wu Hao;Hu Haili et al.Enhanced blue and green upconversion in hydrothermally synthesized hexagonal NaY1-xYb,F4:Ln3+(Ln3+=Er3+ or Tm3+)[J].Journal of Alloys and Compounds,2004,368:94-100. |
| [7] | Thoms R E;Insley H;Hebert G M.The sodium fluoridelanthanide trifluoride systems[J].Inorganic Chemistry,1966(05):1222-1229. |
| [8] | Burlot-Loison R.;Kramer K.;Egger P.;Hulliger J.;Gudel HU.;Pollnau M. .Laser-relevant spectroscopy and upconversion mechanisms of Er3+ in Ba2YCl7 pumped at 800 nm[J].Journal of the Optical Society of America, B. Optical Physics,2000(12):2055-2067. |
| [9] | Sri Slvakumar;Frank C J M Van Veggel;May P Stanley .Near infrared (NIR) to red and green up-conversion emission from silica sel-sel thin films made with La0.45Yb0.50Er0.05F3 nanoparticles,hetero-looping-enhanced energy transfer (Hetero-LEET):a new up-conversion process[J].Journal of the American Chemical Society,2007,129:620-625. |
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