Corrigendum to “Luminescence of ytterbium in CaS and SrS” [J. Lumin. 154 (2014) 445–451] (original) (raw)
Related papers
Luminescence of ytterbium in CaS and SrS
Journal of Luminescence, 2014
CaS and SrS, in particular when doped with divalent europium and/or trivalent cerium, have been extensively studied as phosphor materials. In contrast, surprisingly little is known on the behavior of divalent Yb in both hosts. Therefore we report on the luminescence of divalent ytterbium in calcium sulfide and strontium sulfide. In CaS, an emission peak at 760 nm is found, while in SrS ytterbium emission peaks at a strongly red-shifted 950 nm. It is motivated that the former is typical for the common 5d-4f luminescence, while the latter is typical for anomalous divalent ytterbium luminescence. Depending on the excitation wavelength, trivalent ytterbium luminescence can also be observed in both hosts.
X-ray Excitation Triggers Ytterbium Anomalous Emission in CaF2:Yb but Not in SrF2:Yb
Journal of Physical Chemistry Letters, 2017
Materials that luminesce after excitation with ionizing radiation are extensively applied in physics, medicine, security, and industry. Lanthanide dopants are known to trigger crystals scintillation through their fast d-f emissions; the same is true for other important applications as lasers or phosphors for lighting. However, this ability can be seriously compromised by unwanted anomalous emissions often found with the most common lanthanide activators. We report high resolution X-ray excited optical (IR to UV) luminescence spectra of CaF 2 :Yb and SrF 2 :Yb samples excited at 8949 eV and 80 K. Ionizing radiation excites the known anomalous emission of ytterbium in the CaF 2 host but not in the SrF 2 host. Wavefunction-based ab initio calculations of host-to-dopant electron transfer and Yb 2+ /Yb 3+ intervalence charge transfer explain the difference. The model also explains the lack of anomalous emission in Ybdoped SrF 2 excited by VUV radiation.
Extended Analysis of the Spectrum of Triply-ionized Ytterbium (Yb IV) and Transition Probabilities
Physica Scripta, 2001
The spectrum of Yb IV has been reinvestigated and its analysis has been extended. The present work is supported by the comparison of line intensities with transition probabilities derived from the Cowan (1981) codes. Starting from the ¢rst analysis by Sugar, Kaufman and Spector (1978), the number of established levels has been increased from 111 to 193, including high excitation levels of the new 4f 12 7s+4f 12 6d even con¢gurations. Of the 1023 classi-¢ed lines about one half are new. Computed transition probabilities are given for selected lines.
Physical Review B, 2000
Electron paramagnetic resonance ͑EPR͒, optical absorption, fluorescence, and excitation spectra of CsCdBr 3 :1% Yb 3ϩ single crystals were taken at 4.2 K. An analysis of the dependence of the EPR spectrum on the magnetic-field direction and a comparison of the recorded signal shapes with simulated envelopes over the magnetic dipole transitions of the expected dimers containing all ytterbium isotopes were performed. This allowed us to assign the measured EPR spectra unambiguously to the symmetrical pair center of the type Yb 3ϩ -Cd 2ϩ vacancy-Yb 3ϩ substituting for three adjacent Cd 2ϩ ions in the bromine octahedra chains. A distance of 0.596 nm between the magnetically equivalent Yb 3ϩ ions was determined from the line splitting due to magnetic dipole-dipole interaction. An interpretation of the optical spectra in compounds containing ͑YbBr 6 ͒ 3Ϫ complexes is presented, which is based on a crystal-field theory accounting for an interaction between the ground 4 f 13 (Yb 3ϩ )͓4p 6 (Br Ϫ )͔ 6 and excited 4 f 14 (Yb 2ϩ )4p 5 (Br)͓4p 6 (Br Ϫ )͔ 5 charge-transfer configurations. The observed large splitting of the excited 2 F 5/2 (4 f 13 ) crystal-field multiplet is explained on the basis of a quasiresonant hybridization of the 4 f -hole state with the spin orbitals of the charge-transfer states. With physically reasonable values of the fitted model parameters, the calculated energy level diagram of the 4 f 13 configuration and the g tensor of the Yb 3ϩ ion in the crystal-field ground state are in good agreement with the experimental data.
Inner shell and double excitation spectrum of ytterbium involving the 4f and 6s subshells
Journal of Physics B-atomic Molecular and Optical Physics, 1992
The absorption spectrum of ytterbium in the wavelength range 1200-2000 A has been recorded in the first order of a 3 m spectrograph equipped wilh a 6000 line mm-' holographic grating, using synchrotron radiation as the background source of continuum. More than 200 new levels of Yb I are reponed which are interpreted as the inner shell transitions, 4P46s2 + 4f13(2F,/,,,/,)nd, ng and the doubly excited transitions, 4f"6s2 -4f145d(2D,/,,,/2)np, nf and 4f"6s2 -4f'46p(zP,/2,3/2)ns, nd All the observed levels lie above the first ionization threshold and can be ordered into Rydberg Series converging onlo six limits. The interchannel interactions between the overlapped series have been parametrized using multichannel quantum defect theoty. PI n! 1985, Kaenders e! a! 1990). The. annearanre. rr ifite.gx~mbin~tiofi !ices C i n n D I r -'6''"'Y the breakdown of the L S coupling selection rules. From the observed long Rydberg series, which are amenable to an MQDT analysis, an accurate first ionization limit of ytterbium is derived as 50 443.08 + 0.05 cm-' .
The luminescence of ytterbium(II) in strontium tetraborate
Chemical Physics Letters, 1990
Yb2+ is reported and discussed. The quantum efftciency is high, the Stokes shift small, and the emission maximum at short wavelength (4360 nm). At low temperatures extended vibrational structure appears in all the luminescence spectra. A comparison with other divalent rare-earth ions in this host lattice is made.
Modeling lanthanide complexes: Sparkle/AM1 parameters for ytterbium (III)
Journal of Computational Chemistry, 2005
The Sparkle/AM1 model is extended to ytterbium (III) complexes. Thus, a set of 15 complexes, with various representative ligands, chosen to be representative of all complexes of high crystallographic quality (R-factor Ͻ0.05 Å) in the Cambridge Crystallographic Database, and which possess oxygen and/or nitrogen as coordinating atoms, was used as the training set. In the validation procedure we added 32 more high quality crystallographic structures. For the 47 complexes, the Sparkle/AM1 unsigned mean error for all interatomic distances between the Yb(III) ion and the ligand atoms of the first sphere of coordination is 0.07 Å, similar to present-day ab initio/ECP geometry prediction accuracies, and potentially useful for luminescent complex design while being hundreds of times faster.
Optical study of Yb 3+ /Yb 2+ conversion in CaF 2 crystals
Journal of Physics: Condensed Matter, 2005
Yb 3+ ions with various site symmetries have been observed in the absorption and emission spectra of Yb 3+ :CaF 2 crystals, both γ -irradiated and annealed in hydrogen. The absorption intensity value is found to be much higher for the γ -irradiated crystal and strongly dependent on the gamma dose. The UV absorption spectra of γ -irradiated and H 2 -annealed CaF 2 :5 at.% Yb 3+ crystals are quite similar. Yb 2+ absorption bands are observed at 360, 315, 271, 260, 227 and 214 nm, which are called A, B, C, D, F and G bands, respectively. For γ -irradiated CaF 2 :30 at.% Yb 3+ , an additional band at 234 nm can be seen. It is suggested that only a negligible amount of Yb 3+ ions are converted into Yb 2+ under the γ -irradiation. The presence of Yb 2+ is confirmed by the 565 and 540 nm luminescence under 357 nm excitation. It is also suggested that the excitation in the A, C, D and F absorption bands of Yb 2+ gives rise to photoionization of Yb 2+ ions and electrons in the conduction band to form the excited Yb 3+ ions which emit IR Yb 3+ luminescence.