Spectroscopic study of europium doped RCOB host lattices: evidence of local perturbations

Antić-Fidančev, E.; Lupeǐ, A.; Caramanian, Armen; Aka, G.

doi:10.1016/j.jallcom.2004.03.041

Cited by 8 publications

(6 citation statements)

References 19 publications

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“…Trivalent ions, like Nd 3+ , Yb 3+ and Eu 3+ introduced as dopants in GdCOB replace Gd ions in the matrix. Some authors suggest disorder in the distribution of Gd and Ca ions with respect to their ideal site position [2][3][4]. The presence of some disorder influences the optical properties of these ions.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic study of Eu3+-doped Gd1−Y Ca4O(BO3)3 prepared by sol–gel method

Kłos¹,

Lipińska²,

Solarz³

et al. 2008

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Spectroscopic study of Eu3+-doped Gd1−Y Ca4O(BO3)3 prepared by sol–gel method

Kłos¹,

Lipińska²,

Solarz³

et al. 2008

Journal of Alloys and Compounds

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“…GdCOB crystallizes in monoclinic biaxial crystal system with C m space group. [6][7][8]. The presence of some disorder influences the optical properties of these ions.…”

Section: Introductionmentioning

confidence: 99%

Luminescence characteristics of undoped and Eu‐doped GdCa₄O(BO₃)₃ single crystals and nanopowders

Solarz¹,

Nikl

Kłos

et al. 2007

Cryst. Res. Technol.

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Single crystals of GdCa 4 O(BO 3 ) 3 (GdCOB) pure and doped with Eu concentration of 1 and 4 at% were grown by the Czochralski and micropulling-down methods. The distribution of Eu ions in GdCOB crystals was uniform. The substitutions of Eu 3+ in Gd, Ca(1) and Ca(2) cation sites and eventually formation Eu 2+ have been investigated. The spectroscopic properties of crystals are compared with the properties of nanopowders obtained by sol-gel method. Radioluminescence spectra of undoped GdCOB crystal show the characteristic emission of Gd 3+ at about 312 nm, whereas this emission dramatically decreases in Eu-doped crystals upon X-ray excitation, as well as in Eu-doped nanopowders excited in vacuum ultraviolet (VUV) region. The VUV excitation in the range 125-333 nm for Eu-doped samples leads to strong emission in red coming from the 5 D 0 multiplet of Eu 3+, only. In the photoluminescence decay kinetics of 312 nm emissions substantial shortening and departure for single exponential decay in Eu-doped samples is clearly observed. Higher Eu doping results in further acceleration of the decay. In undoped GdCOB crystal, the lifetime of the Gd 3+ 6 P 7/2 multiplet is 2.79 ms. The Eu 3+ 5 D 0 decay kinetics monitored at 613 nm are rather constant. Numerical fitting of fully exponential curves, reveals lifetimes 2.7 ms for nanopowder and 2.5 ms for single crystal. The results suggest that this material may be used as a red phosphor in plasma display panels in nanopowder form because of strong excitation band of Eu 3+ luminescence in the 160-200 nm regions. Contrary to nanopowder sample, such an excitation band, attributed to the Gd 3+-O 2-charge transfer was not observed in crystal obtained by the micropulling-down method.

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“…An analysis of the low temperature absorption and selectively excited luminescence spectra of Eu 3+ ion embedded in GdCOB, and of concentrated EuCOB crystals is presented. For Eu 3+ ion, 3003 states exist for ground 4f 6 configuration, but only a small number of them are accessible effectively. And, in fact, two terms are the most frequently analyzed, a ground term and the first excited term, 7 F and 5 D, respectively, via 5 D 0-2 ⇔ 7 F 0-4 transitions in absorption as well as in emission spectra.…”

Section: Resultsmentioning

confidence: 99%

Evidence of Dopant-Matrix Interaction in Optical Spectra of Rare Earth Ions

Antić-Fidančev

2005

MSF

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Complex emission spectra of europium doped rare earth calcium oxoborates, EuCa4O(BO3)3 - EuCOB, and GdCa4O(BO3)3: Eu3+- GdCOB: Eu3+, were finely analyzed for better understanding of some local perturbations detected in these solid media. Highlighting a “size effect” of dopant / matrix ions, the interaction between the host lattice and the embedded ion is demonstrated. The evolution of the crystal field strength of R3+ ions along the rare earth series is presented for C-type RE2O3 oxides. According to R3+ - RE3+ ionic radii difference (R3+ for a dopant ion and RE3+ for a matrix ion), two opposite standings are evidenced along a series. Effect of high concentration doping on spectral line broadening is illustrated following a half-height width of 2P1/2 level of Nd3+ ion in A-type La2O3 oxide.

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Spectroscopic study of europium doped RCOB host lattices: evidence of local perturbations

Cited by 8 publications

References 19 publications

Spectroscopic study of Eu3+-doped Gd1−Y Ca4O(BO3)3 prepared by sol–gel method

Spectroscopic study of Eu3+-doped Gd1−Y Ca4O(BO3)3 prepared by sol–gel method

Luminescence characteristics of undoped and Eu‐doped GdCa₄O(BO₃)₃ single crystals and nanopowders

Evidence of Dopant-Matrix Interaction in Optical Spectra of Rare Earth Ions

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Spectroscopic study of europium doped RCOB host lattices: evidence of local perturbations

Cited by 8 publications

References 19 publications

Spectroscopic study of Eu3+-doped Gd1−Y Ca4O(BO3)3 prepared by sol–gel method

Spectroscopic study of Eu3+-doped Gd1−Y Ca4O(BO3)3 prepared by sol–gel method

Luminescence characteristics of undoped and Eu‐doped GdCa4O(BO3)3 single crystals and nanopowders

Evidence of Dopant-Matrix Interaction in Optical Spectra of Rare Earth Ions

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Luminescence characteristics of undoped and Eu‐doped GdCa₄O(BO₃)₃ single crystals and nanopowders