Absorption and fluorescence of Er3+-doped LiYF4: measurements and simulation

Santos, M.A. Couto dos; Antić-Fidančev, E.; Gesland, J.Y.; Krupa, J.C.; Lemaı̂tre-Blaise, M.; Porcher, P.

doi:10.1016/s0925-8388(98)00363-6

Cited by 47 publications

(35 citation statements)

References 12 publications

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“…However due to J-mixing it is not correct to In contrast with the conclusions of Ref. [9], the simulaexclude the magnetic dipole contributions and the global tion of the CF energy diagram is more adequate using the dipole strength is calculated as given in Eq. The Zeeman energy diagram is calculated using the 62), (6, 5, 62), (6, 7, 62) and (6, 7, 66) have to be optimised parameter values and the diagonalisation is considered, each consisting of a real and imaginary part.…”

Section: Energy Diagrammentioning

confidence: 83%

“…In view of these single crystal. The obtained parameter sets are evaluated in applications the energy diagram of the neodymium ion in a graphical simulation of another spectroscopic phenomLiYF is extensively studied using the approximating D enon, magnetic circular dichroism (MCD), and in a non-4 2 d 31 point group as site symmetry of the Nd [6][7][8][9]. More spectroscopic property, namely the magnetic susceptibility.…”

Section: Introductionmentioning

confidence: 99%

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Magneto-optical properties of neodymium-doped LiYF4

Leebeeck

Binnemans

Görller‐Walrand

1999

Journal of Alloys and Compounds

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In this paper we demonstrate the validity of a semi-empirical approach to describe the magneto-optical properties of lanthanide 31 complexes. The polarised absorption (IR-VIS-UV), magnetic circular dichroism (MCD) and magnetic susceptibilities of a LiYF :Nd 4 (1.5%) single crystal were recorded and analysed in a temperature region of 4.2 K up to room temperature. The crystal structure is obtained by means of X-ray analysis. Starting values of the free ion, crystal field and intensity parameter sets were obtained by using an -additive crystal-field model based on the coordinates of the eight F ions in the first coordination sphere (S symmetry). After several 4 iterations the parameter values are optimised and checked by simulations of the optical and magneto-optical spectra and by the simulation of the magnetic susceptibilities.

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Section: Energy Diagrammentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Magneto-optical properties of neodymium-doped LiYF4

Leebeeck

Binnemans

Görller‐Walrand

1999

Journal of Alloys and Compounds

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“…[19]. Therefore, first our results on the energy levels in the region 39 000-44 000 cm À1 are compared with those from [19] (table 1), and next the previously unobserved higher-energy transitions are discussed (table 2).…”

Section: Methodsmentioning

confidence: 91%

“…Both set-ups are described extensively in [12], and details on the time-resolved measurements are given in [17]. [19]. Therefore, first our results on the energy levels in the region 39 000-44 000 cm À1 are compared with those from [19] (table 1), and next the previously unobserved higher-energy transitions are discussed (table 2).…”

Section: Methodsmentioning

confidence: 99%

Luminescence spectroscopy of high-energy 4f¹¹levels of Er³⁺in fluorides

et al. 2003

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The 4 f 11 energy levels of Er 3þ in LiYF 4 in the spectral region 39 000-65 000 cm À1 have been studied. The agreement between experimental energy levels, obtained from luminescence excitation spectra, and calculated energy levels is good. Luminescence originating from high-lying energy levels has been investigated. in LiYF 4 , where it lies in between the two lowest 4 f 10 5d states. IntroductionThe need for luminescent materials for excitation in the vacuum ultraviolet spectral region (VUV; E > 50 000 cm À1 , < 200 nm) has triggered an increase in research on the VUV spectroscopy of lanthanides. These materials (VUV phosphors) are required for application in mercury-free fluorescent lamps and in plasma display panels [1]. In these devices the VUV radiation generated by a noble gas discharge (e.g. Xe) has to be converted into visible light. In theory, the high energy of VUV photons is sufficient to generate two visible photons for each VUV photon absorbed by a phosphor. In other words, it is theoretically possible to obtain visible quantum efficiencies higher than 100%, which is called quantum cutting. In contrast, the quantum efficiencies of (UV) phosphors used in mercury discharge fluorescent tubes cannot exceed 100% due to the lower energy of the exciting photons. The use of VUV phosphors with quantum efficiencies above 100% can compensate for the lower number of photons generated per watt by the noble gas discharge relative to the mercury discharge.Because of their sharp-line emissions, trivalent lanthanide ions are optical centres for which quantum cutting, or photon-cascade emission, can possibly be obtained. Indeed, quantum cutting has been demonstrated for

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“…However, the D 2d symmetry is proved to be a good approach due to the rather small distortion from D 2d to S 4 [20,21], as treated for some trivalent rare earth ions in similar scheelite-type LiYF 4 by many authors [22,23]. So we still take the D 2d approximation here for simplicity.…”

Section: Calculationmentioning

confidence: 99%

Investigations of the EPR g Factors for Er₃₊ in CaMoO₄

Dong

2004

Zeitschrift Für Naturforschung A

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The electron paramagnetic resonance (EPR) g factors g and g ⊥ for Er 3+ in CaMoO 4 are theoretically investigated by using the perturbation formulas of the g factors for a 4f 11 ion in tetragonal symmetry. In these formulas, the contributions to the g factors arising from the second-order perturbation terms and the admixture of various states are considered. The crystal-field parameters for the tetragonally distorted tetrahedra are determined by using the superposition model and the structural data of the impurity Er 3+ on the host Ca 2+ site in CaMoO 4 . The calculated g factors agree with the observed values. The validity of the results is discussed.

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Absorption and fluorescence of Er3+-doped LiYF4: measurements and simulation

Cited by 47 publications

References 12 publications

Magneto-optical properties of neodymium-doped LiYF4

Magneto-optical properties of neodymium-doped LiYF4

Luminescence spectroscopy of high-energy 4f¹¹levels of Er³⁺in fluorides

Investigations of the EPR g Factors for Er₃₊ in CaMoO₄

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Absorption and fluorescence of Er3+-doped LiYF4: measurements and simulation

Cited by 47 publications

References 12 publications

Magneto-optical properties of neodymium-doped LiYF4

Magneto-optical properties of neodymium-doped LiYF4

Luminescence spectroscopy of high-energy 4f11levels of Er3+in fluorides

Investigations of the EPR g Factors for Er3+ in CaMoO4

Contact Info

Product

Resources

About

Luminescence spectroscopy of high-energy 4f¹¹levels of Er³⁺in fluorides

Investigations of the EPR g Factors for Er₃₊ in CaMoO₄