| 光谱学与光谱分析 |
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| Two-Photon Up-Conversion Fluorescence of a Neodymium Organic Framework Nd(BTC) |
| XU Hui,JIN Run-zhi,WU Chun-yang,YANG Yu*,QIAN Guo-dong |
| Department of Materials Science & Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China |
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Abstract In the present work, a neodymium organic framework Nd(BTC) was synthesized by the solvothermal reaction of Nd(NO3)3·5H2O and H3BTC (BTC=1,3,5-benzenetricarboxylate) in mixed solvents of DMF, ethanol and water, and was identified by elemental analysis.This MOF complex was characterized using X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (TGA-DSC) analysis, UV-visible absorption spectra and fluorescence spectra.This polycrystalline powder lost DMF and H2O when heated to 120 ℃, then remained stable till the temperature reached 500 ℃.Near infrared fluorescence at 1064 nm due to the 4F3/2→4I11/2 transition of Nd3+ ions was exhibited when excited by 808 nm laser beam.It was also been found that up-conversion fluorescence of Nd(BTC) peaked at about 450 nm due to 2D5/2→4I11/2 transition of Nd3+ ions can be observed under the excitation of a 580 nm laser line.The mechanism of the up-conversion fluorescence of Nd(BTC) at around 450 nm under the excitation of 580 nm laser can be ascribed to both excited-state absorption and energy transfer up-conversion.This result indicated that such MOF can be employed as an up-conversion luminescence material in many potential application areas such as bio-labeling and fluorescence image.
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Received: 2007-03-02
Accepted: 2007-06-06
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Corresponding Authors:
YANG Yu
E-mail: yuyang@zju.edu.cn
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