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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,[link widoczny dla zalogowanych], 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,[link widoczny dla zalogowanych], FluorineChem. , 2001. 107,235.4. C. ; Wang, X. ; Lin, J. H. ; You,[link widoczny dla zalogowanych], L. Chem. Commun. 211111,1178.5. Li, L. Y; Lu'C. ; Wang, Y; Jin, X. L. ; Li, GB. ; Wang, YX. ; You, L. ; Lin,[link widoczny dla zalogowanych], J. H. Chem. Mater. Inpress. 6. J. H. Burns, lnorg. Chem. 519,961,222.7. T. Wegh, A. Meijerink, Phys. Rev. B, 1999,60,[link widoczny dla zalogowanych],10820.
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