Investigations of the vibronic transitions in Cs2NaErCl6

Jeżowska‐Trzebiatowska, B.; Ryba‐Romanowski, W.; Mazurak, Z.; Hanuza, J.

doi:10.1016/0301-0104(80)87039-x

Cited by 32 publications

(24 citation statements)

References 16 publications

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“…The optical absorption measurements and crystal field analysis reported here for Er 3+ in Cs2NaErCI6 go somewhat beyond the previously reported experimental [16] and theoretical [15] studies on this system. Our absorption measurements were obtained over a wider temperature range and at a higher spectral resolution, and our theoretical analysis of the spectra includes calculations of vibronic line intensities as well as magnetic dipole origin intensities.…”

Section: Introductionmentioning

confidence: 69%

“…In each of these studies [12,13,14] the crystal field structure of the 4115/3 ground state term level Downloaded by [Duke University Libraries] at 23:24 02 January 2015 could be probed. More directly relevant to the present study are recent papers by Morrison et al [15] and by Jezowska-Trzebiatowska et al [16]. Morrison et al [15] carried out a purely theoretical (computational) crystal field analysis of Er 3+ in Cs2NaErC16 in which they calculated crystal field energy levels, g-factors for crystal field states and magnetic dipole transition probabilities for transitions between crystal field states.…”

Section: Introductionmentioning

confidence: 96%

“…This theoretical study made use of crystal field parameters calculated directly from a specific crystal field model developed by the authors [15]. The study by Jezowska-Trzebiatowska et al [16] was essentially experimental in nature and included low temperature magnetic susceptibility measurements, infrared and Raman spectra, and low temperature optical absorption spectra. In the latter study an attempt was made to assign the origin lines and vibronic lines observed in the optical absorption spectra.…”

Section: Introductionmentioning

confidence: 99%

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Optical absorption spectra and crystal field analysis of Er³⁺in the cubic Cs₂NaErCl₆system

Hasan¹,

Richardson²

1982

Molecular Physics

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Optical absorption spectra are reported for the 4115/2 "-9"4113/2, 4111/2, 4F9/2, 4S3/2, ~Hlx/2, 4F7/2, 4F5/2, 4F3/2, ~Gg/~ and 4Gn/2 transition regions of Er a+ in the cubic Cs~NaErCI6 system. These spectra, obtained under variable temperature conditions (2.6K to 300 K), are analysed on the basis of a crystal field model in which the Er a+ ions are assumed to reside at sites of exact octahedral (Oh) symmetry. This crystal field model is used to calculate energy levels and to calculate the magnetic dipole strengths and intensities of crystal field transition origin lines. Vibronically-induced electric dipole strengths are also calculated using a model in which the ErCI63-clusters are treated as isolated chromophoric units (uncoupled to the lattice). This latter model allows calculation of electric dipole intensities for the vibronic lines associated with the v3(t2u), v4(tlu) and v~(t~u) vibrational modes of the ErCI~ 3-cluster (the so-called moiety modes). Detailed analysis of the spectra leads to the location and assignment of all crystal field levels split out of the 4123/~, 4In~z, 4F9/~, 4Sa/2, ~Hn/2, 4F~/z, 4F5/~, 4Fa/2, 2G9/2 and 4G21/2 intermediate-coupling states, and of the three lowest-lying crystal field levels split out of the 4125/2 ground state. The best fit between the calculated and observed crystal field energy level schemes was achieved using the values of crystal field coefficients BoO) = 1608 cm -2 and B0 (6) = -195 cm -1 (defined according to the unit-tensor formalism). The most intense transitions were observed (and calculated) to be 41~512 -+4Glt/z > 4Ila12 > 2H21/z. The 4125/3 -'."4Ila/z transition region is entirely dominated by intense magnetic dipole origin lines, whereas nearly all of the intensity in the 4125/2-+4Gn/2 and ~Hn/2 transition regions is found in vibronic lines associated with the v6(85-90cm-2), v4(107-114cm -t) and v3(245-260 cm -2) ErCl~ 3-moiety modes.

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Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Optical absorption spectra and crystal field analysis of Er³⁺in the cubic Cs₂NaErCl₆system

Hasan¹,

Richardson²

1982

Molecular Physics

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“…Although spectra recorded may not be contradictory to this conclusion, the relaxation dynamics of both the 3 P 0 and 1 D 2 multiplets implies that the inversion symmetry is destroyed, probably by influence of the second coordination sphere. Relaxation of excited states of rare earth ions involving vibronic transitions was studied thoroughly in the model system Cs 2 NaRECl 6 (rare earth (RE) ions) in the past [17][18][19]. Characteristic features of vibronic decay, namely very small radiative transition rates and their strong temperature dependencies were then evidenced.…”

Section: Relaxation Dynamics Of the 3 P 0 And 1 Dmentioning

confidence: 99%

Luminescence and energy transfer in K3GdF6:Pr3+

Gusowski

Dominiak‐Dzik

Solarz

et al. 2007

Journal of Alloys and Compounds

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Single phase, polycrystalline K 3 GdF 6 compound containing 1 at.% of Pr 3+ was prepared and its luminescent properties were investigated in the 10-300 K temperature region. The temperature weakly influences the 3 P 0 emission, whereas the 1 D 2 emission decreases from 520 s at 10 K to 219 s at 290 K due to temperature dependent self-quenching effect. Excitation spectra provide evidence that the energy is transferred from the 5d levels of Pr 3+ to the energy levels belonging to the 4f 7 configuration of Gd 3+ .

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“…In our previous work [1] we reported for the first time the absorption properties of Cs 2 ΝaErC16 and we proposed the assignments of vibronic transitions of Er3+. More extensive study of the compound has been next reported by Hasan and Richardson [2].…”

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confidence: 93%

Relaxation of the⁴S_3/2Level of Er³⁺in Cs₂NaErCl₆

1993

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Octahedral (Oh ) symmetry of the RE 3+ sites in the Cs2NaREC16 crystals removes all of the electric dipole intensity from the 4f-4f transitions. Thus the decay of luminescence originating in the excited states of RE ions is governed by phonon assisted (vibronic) transitions, multiphonon relaxation and phonon assisted energy transfer (cross relaxation and energy migration to impurities). Contribution of these processes to the decay of the 4S3 /2 state of erbium in Cs2 ΝaΕrCl 6 has been studied in the 4.2-300 K temperature region. It has been concluded that at low temperatures the 4S3 /2 state decays exclusively by vibronic transitions. At about 100 K the cross relaxation via the 4I9/2 state becomes operative. Efficiency of this process grows strongly with increasing temperature, reducing the 4S3 /2 lifetime by almost three orders of magnitude. No evidence has been found that multiphonon relaxations contribute to the decay of the 4S3 /2 state. PACS numbers: 78.55.ΗxIn our previous work [1] we reported for the first time the absorption properties of Cs 2 ΝaErC16 and we proposed the assignments of vibronic transitions of Er3+. More extensive study of the compound has been next reported by Hasan and Richardson [2]. Both the studies are very useful for the interpretation of luminescence spectra and lifetimes since they provide the energies of excited states of Er3+ as well as the vibrational modes of ErC1 3 6 -moiety. Preliminary data on Er3+ luminescence obtained with broadband excitation into the 4 F7/2, 4F5/2, 2G9/2 and 4G1 1 / 2 group of levels indicated that the 4F9 /2, 4I9/ 2 and 4Ι11/2 luminescent states are populated by direct vibronic transitions from initially excited levels or by ion-ion interaction [3].In this work the processes contributing to the relaxation of the 4S3/2 state of Er3+ are examined. As the Er3+ ions in Cs 2 ΝaErCl6 are situated in the sites of octahedral (Oh) symmetry, the electric dipole transition are forbidden. Therefore the excited 4S3 /2 level may decay by phonon assisted (vibronic) transitions, multiphonon relaxation to the next lower lying level and by ion-ion interaction. In Fig. 1 we present the lifetimes of the 4S3 /2 level of Er3+ in Cs2 ΝaErCl6 and in Cs2ΝaEr0.2Y0 4Yb0.4C16 recorded in the 100-300 Κ temperature region. Temperature influences more strongly the lifetimes measured for diluted sample indicating (941)

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Investigations of the vibronic transitions in Cs2NaErCl6

Cited by 32 publications

References 16 publications

Optical absorption spectra and crystal field analysis of Er³⁺in the cubic Cs₂NaErCl₆system

Optical absorption spectra and crystal field analysis of Er³⁺in the cubic Cs₂NaErCl₆system

Luminescence and energy transfer in K3GdF6:Pr3+

Relaxation of the⁴S_3/2Level of Er³⁺in Cs₂NaErCl₆

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Investigations of the vibronic transitions in Cs2NaErCl6

Cited by 32 publications

References 16 publications

Optical absorption spectra and crystal field analysis of Er3+in the cubic Cs2NaErCl6system

Optical absorption spectra and crystal field analysis of Er3+in the cubic Cs2NaErCl6system

Luminescence and energy transfer in K3GdF6:Pr3+

Relaxation of the4S3/2Level of Er3+in Cs2NaErCl6

Contact Info

Product

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Optical absorption spectra and crystal field analysis of Er³⁺in the cubic Cs₂NaErCl₆system

Optical absorption spectra and crystal field analysis of Er³⁺in the cubic Cs₂NaErCl₆system

Relaxation of the⁴S_3/2Level of Er³⁺in Cs₂NaErCl₆