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1.
The optical properties of irradiated RbMgF3:Eu2+ and KMgF3:Eu2+ have been investigated. Previous research has shown that Eu2+ ions in unirradiated RbMgF3 give rise to broad band absorption around 250 nm and sharp intense line emission at 360 nm. When this material is irradiated little or no change occurs in the 250 nm absorption, but the lifetime of the Eu2+ 360 nm transition is reduced. In addition, new emission is observed at 680 nm. In the case of irradiated KMgF3:Eu2+ two new emission bands are observed at 600 and 800 nm. All of these transitions have short lifetimes and are not due to Eu3+ ions. 相似文献
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The optical absorption spectra of EuCl3 in aqueous and acidic solutions were measured in the visible anduv regions of the spectrum. The concentration as well as the temperature of the solutions were varied to establish an accurate
free-ion energy level scheme of Eu3+. The energy levels were assigned on the basis of a correlation between the calculated and the experimentally observed transition
energies and associated band intensities. 相似文献
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Lead phosphate glasses containing Eu(3+) and Dy(3+) have been studied. Local structure was verified using Fourier transform (FT)-IR spectroscopy. Emission bands of Eu(3+) and Dy(3+) ions in lead phosphate glasses are observed in the visible spectral range, which correspond to 5D0→7F(J) (J=0,1,2,4) and 4F(9/2)→6H(J/2) (J=15,13,11) transitions, respectively. Shorter luminescence decays from excited states of Eu(3+) and Dy(3+0 are due to the presence of PbO in phosphate glass. 相似文献
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Eu3+在硼酸盐玻璃中的发光以及Bi3+对Eu3+的敏化作用 总被引:6,自引:1,他引:6
本文研究了单掺和双掺(Eu3+,Bi3+,Fu3++Bi3+)约二十余种不同成份的硼酸盐玻璃,探讨了玻璃成份对Eu3+发光性质的影响和Bi3+对Eu3+的敏化作用. 相似文献
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The spin-Hamiltonian (SH) parameters (g factors g //, g ⊥ and hyperfine structure constants A //, A ⊥) for Co2+ ions at the trigonal Mg2+ (I) and Mg2+ (II) sites of RbMgF3 crystal are calculated from the second-order perturbation formulas based on the cluster approach for 3d7 ions in trigonal symmetry. From the calculations, it is found that the calculated SH parameters for Co2+ ion at the Mg2+ (I) site are in poor agreement with, but those for Co2+ at the Mg2+ (II) site are close to, the experimental values. Therefore, we suggest that Co2+ in RbMgF3 crystal substitutes for Mg2+ (II) ion. The results are discussed. 相似文献
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U. Köbler 《Zeitschrift für Physik A Hadrons and Nuclei》1971,247(4):289-303
All the optical transitions of Eu3+ ions substituted on Y3+ lattice sites of point symmetryC 2 orC 3i in Y2O3 show weak extra lines (satellites) extending over a range of few wavenumbers on both sides of the main line. It is proved by a study of the concentration dependence of the intensities of these satellites that they arise from pairs of two identical Eu3+ ions, interacting with each other when their separation is less then ~9 Å. By means of absorption and fluorescence excitation spectra of the transitions of Eu3+ at lattice sites of point symmetryC 3i , first, second and third nearestC 3i -C 3i neighbour pairs could be identified. The mean pair interaction is of the order of 5 cm?1 and is assumed to be due to superexchange via the oxygen ions. 相似文献
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G. G. Demirkhanyan 《Laser Physics》2006,16(7):1054-1057
The line strengths of indirect electric dipole and magnetic dipole transitions between Stark sublevels of the Yb3+ impurity ion in a YAG crystal are calculated. The intensity’s parameters are determined, and the spectroscopic characteristics of inter-Stark transitions (probabilities of spontaneous transitions and radiative lifetimes of Stark sublevels of excited multiplet, fluorescence branching ratios, transition cross sections, and absorption coefficients) are computed. Quantitative calculations of spectroscopic parameters revealed a quite reasonable agreement with experimental data. 相似文献
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V. Lavin V. D. Rodriguez I. R. Martin U. R. Rodriguez-Mendoza I. Szabo Zs. Rasztovits 《Journal of Applied Spectroscopy》1995,62(4):766-770
Conclusions Emission and excitation spectra as well as the lifetime and the Judd-Ofelt parameters were determined for the different sites
occupied by Eu3+ ions in a fluorzirconate glass. As has been observed in borate glasses, the Ω4 parameter increases with the excitation energy of the7F0→5D0 transition, while Ω4 is nearly constant [5, 6]. These parameters are lower than in borate glasses by a factor of close to 3. The optical properties
of the Eu3+ ions in the studied glass appear to be dominated by only one class of sites; however, the presence of a second class of sites
is possible. Efficient energy transfer from Eu3+ to Ho3+ is observed, but the energy transfer parameter does not depend appreciably on the excitation wavelength.
Published in Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 4, pp. 185–190, July–August, 1995. 相似文献
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电子俘获光存储材料BaLiF3:Eu2+的光激励发光及光存储性质研究 总被引:4,自引:4,他引:0
利用高温固相反应法制备了混晶状的BaLiF3:Eu2 样品.其紫外光激发的发射峰与光激励发光峰均在410 nm处,属于Eu2 的5d-4f跃迁发光.光激励峰位于660 nm,因而可以配用简单廉价的氦氖激光器.根据光谱特征给出了光激励发光的简单机理.测量了该材料光激励发光衰减性能,结果表明BaLiF3:Eu2 存储的信息可以方便地擦除掉.该材料具有优良的光激励发光特性,是一类很有发展前途的电子俘获光存储材料. 相似文献
18.
M. Aguilar G. J. Rubio O. F.J. López J. Garciá-Solé H.S. Murrieta 《Solid State Communications》1982,44(2):141-144
Europium precipitation in monocrystalline KBR has been studied using optical absorption and photoluminescence techniques. The annealing of quenched samples at temperatures below 100°C produces the growth of an emission band peaking at 433 nm which appears to be related with the presence of Suzuki-type precipitates in the crystals. The aging at higher temperatures, however, produces the appearence in the emission spectrum of two other bands peaking at 427 and 459 nm. The data presented in this paper strongly suggest that the former band is associated with the stable dihalide phase EuBr2 in the host KBr, while the latter is due to a metastable precipitate whose structure appears to be quite similar to that of europium bromide. Some of the characteristics of the second phase precipitates were obtained by measuring the crystal field splitting (10 Dq) of the 4f65d configuration of the Eu2+ ions in each one of them. 相似文献
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Ni2+:RbMgF3的电子顺磁共振谱的研究 总被引:3,自引:2,他引:1
许长谭 《光谱学与光谱分析》2004,24(12):1594-1596
含有过渡金属离子的晶体的光学吸收谱、零场分裂D值和g因子与晶体结构有密切关系,应用Ni^2 的参量化d轨道和三角晶场中d^8电子组态的强场能量矩阵,通过建立完全对角化方法,精确地计算了具有C3ν和D3d两种对称的Ni^2 :RbMgF3的电子顺磁共振谱,分析了Ni^2 :RbMgF3的零场分裂D值和g因子与晶体结构参量R和θ的依赖关系。理论值与实验值符合得很好。 相似文献