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 Wysłany: Sob 21:43, 27 Lis 2010 Temat postu: ugg boots sale New rare-earth borate and fluoride |
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New rare-earth borate and fluoride structure and properties of VUV fluorescence
Fang NaGdF4: Eu sample in the ultraviolet and vacuum ultraviolet excitation spectra. Figure 4 (b) in the vicinity of the 250rim a strong O2. Eus + charge transfer band, indicating that the heat treatment in air from the six-party NaGdF4: Eu to cubic NaGdF4: Eu in the transformation process, O2. Replaced the lattice part of the F. Figure 4 (a), located in the vicinity of 120nm with a strong broadband absorption, which may come from Gds + in the 4f-5d transition of Fi. For cubic NaGdF4: Eu, a strong move to 177nm excitation peak near that part of the F samples was o2. Replaced, Gds + the 5d energy state of the ligand field effect of strengthening further, 4f-5d transition energy to reduce this band coincided with the Xe electric discharges,, lJV radiation rather, therefore, cubic NaGdF4: Eu in the energy absorption area is in line with ,, lJV fluorescent material requirements. Figure 5 (a) (b) are the six-party NaGdF4: Eu, cubic NaGdF4: Eu excited by the Ⅵ Ⅳ emission spectra. Their emission peaks are to Do-oriented electric dipole transition, indicating that the crystal is noncentrosymmetric Gewei E. For the six-party NaGdF4: Eu, which is consistent with the characteristics of the crystal, but in cubic NaGdF4: Eu, the rare earth ion has a central symmetry, spectral characteristics and structural features seem to contradict some of which may be due to F is o2. Replaced, the rare earth ions deviate from the centrosymmetric Gewei, so forbidden, lF2 parity transitions become allowed transitions, and we can see Figure 5 (b), in addition to the red emission l08 5DoI7F2 a-n. | A look. c3 Trinity-n. I-Kui. -. Three Summer 2002 Beijing Synchrotron Radiation Facility users report Figure 4a: the six-party NaGdF4: Eu excitation spectra of b: cubic NaGdF4: Eu excitation spectra of WavelengthInml Figure 5a: the six-party NaGdF4: Eu emission spectra (120nm) b: cubic NaGdF4: Eu's emission spectroscopy (177nm) Figure 6 (a), (b) were given 195nm (SSTaGJ) and 273nm (SSTaIJ)) excited by the six-party N Juan Mindanao: E fluorescence spectroscopy. When the matrix of Gd, children were excited to GJ to state, can occur. 6GJPJ and PJ. STa in the transition process; with the first photon energy interval corresponding to GJ'PJ relatively small,ugg boots sale, only the EII ions from the FJ excited energy state to the D0, the corresponding emission is D0FJ transition. Corresponding with the second photon relatively large energy gap --- hSTa can be excited Eu3 ions from the FJ to 1) 3 to state, so I can get from the Eu, ion excited state at all levels, Dl, 5D2, to the ground state FJ series of emission transitions, which occurred in two-photon emission, and enhanced the quantum efficiency. Gd3 ions 6IJ excited energy state (273nm) light-emitting photon process and the second line. The figure corresponds to the two-photon WavelengthInm) Figure 6: the six-party NaGdF4: Eu (0.5mo1%) of the fluorescence emission spectra (5Do / ~ l'2. 3) GJ indeed greater than the corresponding single-photon emission (5Do/SDl , 2,3) IJ, confirmed the 195nm excitation six NaGdF4: Eu two-photon emission phenomenon. References I. C. R. Ronda, AlloysCompds. . 2251995534.2. J. C. Kn ~ a, A. MayoletandM. Queffelec, Ann. Chim. Mat. , 1998,23,431.3. M. EJoubext, YGuyo ~ B. Jaequier, J. Chaminade, A. Garcia,uggs ireland, FluorineChem. , 2001. 107,235.4. C. ; Wang, X. ; Lin, J. H. ; You,ghd styler, L. Chem. Commun. 211111,1178.5. Li, L. Y; Lu'C. ; Wang, Y; Jin, X. L. ; Li, GB. ; Wang, YX. ; You, L. ; Lin,ugg boots ireland, J. H. Chem. Mater. Inpress. 6. J. H. Burns, lnorg. Chem. 519,961,222.7. T. Wegh, A. Meijerink, Phys. Rev. B, 1999,60,ugg stiefel,10820.
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