Luminescence of undoped LuAG and YAG crystals

Babin, V.; Blažek, K.; Krasnikov, А.; Nejezchleb, Karel; Nikl, M.; Savikhina, T. I.; Zazubovich, S.

doi:10.1002/pssc.200460120

Cited by 120 publications

(94 citation statements)

References 9 publications

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“…Maxima of short-wavelength fast emission detected at low temperature are reported to be at 258-262 nm in YAG and at 250-254 nm in LuAG and assigned to luminescence of self-trapped excitons (STE). A broad intrinsic emission at longer wavelength with decay time of sub-or microsecond range was assigned as originating from emission of excitons localised on Y Al and Lu Al anti-site defects or emission of anti-site defects themselves [11,12]. It is to be noted that the excitation spectra recorded for STE and defect-related emission in Y 3 Al 5 O 12 and Lu 3 Al 5 O 12 [10][11][12] have similar behaviour as the excitation spectra recorded for the short-and long-wavelength emission components of Ca 3 Sc 2 Si 3 O 12 (see Figs.…”

Section: Structural Detailsmentioning

confidence: 99%

Optical spectroscopy of Ca3Sc2Si3O12, Ca3Y2Si3O12 and Ca3Lu2Si3O12 doped with Pr3+

Ivanovskikh

Meijerink

Piccinelli

et al. 2010

Journal of Luminescence

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a b s t r a c tThe silicates Ca 3 Sc 2 Si 3 O 12 , Ca 3 Y 2 Si 3 O 12 and Ca 3 Lu 2 Si 3 O 12 , both undoped and doped with Pr 3 + ions, have been synthesized by solid-state reaction at high temperature. The luminescence spectroscopy and the excited state dynamics of the materials have been studied upon VUV and X-ray excitation using synchrotron radiation. All doped samples have shown efficient 5d-4f emission upon direct VUV excitation of 5d levels, but only Ca 3 Sc 2 Si 3 O 12 :Pr 3 + shows luminescence upon interband VUV or X-ray excitation. The VUV excited emission spectra of Ca 3 Y 2 Si 3 O 12 :Pr 3 + and Ca 3 Lu 2 Si 3 O 12 :Pr 3 + show features attributed to emission from two distinct sites accommodating the Pr 3 + dopant. The decay kinetics of the Pr 3 + 5d-4f emission in Ca 3 Sc 2 Si 3 O 12 :Pr 3 + upon VUV excitation across the band gap are characterized by decay times in the range 25-28 ns with no significant rise after the excitation pulse. They appear to be faster upon X-ray irradiation than for VUV excitation. Weak afterglow components are attributed to defect luminescence.

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Section: Structural Detailsmentioning

confidence: 99%

Optical spectroscopy of Ca3Sc2Si3O12, Ca3Y2Si3O12 and Ca3Lu2Si3O12 doped with Pr3+

Ivanovskikh

Meijerink

Piccinelli

et al. 2010

Journal of Luminescence

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“…Extended x-ray-absorption fine structure, x-ray-absorption near-edge spectroscopy and positron annihilation spectroscopy studies have established that among the intrinsic defects, antisite defects ͑AD͒ are dominant. 4,5 They are known to act as shallow electron traps and they affect the structure, the luminescence, and other properties of pure 6 and doped YAG. 7,8 Antisite defects appear in YAG when yttrium and aluminum atoms exchange positions.…”

Section: Introductionmentioning

confidence: 99%

Atomistic and electronic structure of antisite defects in yttrium aluminum garnet: Density-functional study

2009

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First-principles density-functional theory calculations have been performed on the atomistic structure, electronic structure, and distribution of antisite defects ͑AD͒ in yttrium aluminum garnet ͑YAG͒ Y 3 Al 5 O 12 . The formations of one and two antisite defects per unit cell are endothermic and the formation energy per defect is lower in 2AD than in 1AD. In the most stable 1AD structure, Y and Al are as close as possible and two oxygen atoms become unbound to Al rising the energy of their ͑highest͒ valence levels and introducing a defect level in the gap 0.25 eV above the top of the perfect YAG valence band. The binding energy between the individual substitutional defects Y Al and Al Y to form 1AD is 0.74 eV. The most stable 2AD structure is made of two single ADs linked together with one AlO 6 moiety and it has basically the same electronic structure as the most stable 1AD; it is the only 2AD structure that preserves the inversion center with respect to the unit-cell center. In this case, the binding energy between two single ADs is 0.22 eV.

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“…Under excitation of the undoped, meltgrown bulk single crystals (SC) in the band-to-band and exciton energy range, an intense complex slow intrinsic luminescence was observed in the UV spectral range. Such emissions were ascribed to the exciton localized near the Lu Al 3+ or Y Al 3+ antisite defects [5][6][7] and to the antisite defects themselves [8]. The presence of such defects in the garnet and perovskite structures was predicted also by theoretical calculations [9][10][11][12] and the ability of such defects to create shallow electron traps was recently theoretically examined in YAP [13].…”

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confidence: 99%

Luminescence of dimer lead centers in aluminium perovskites and garnets

Babin

Bichevin

Gorbenko

et al. 2009

Physica Status Solidi (b)

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Steady‐state emission and excitation spectra and luminescence decay kinetics were studied at 80–300 K under excitation in the 2.5–6.0 eV energy range for undoped and Ce3+‐doped aluminium garnet (Lu3Al5O12, Y3Al5O12) and aluminium perovskite (LuAlO3, YAlO3) single crystalline films (SCF) grown by Liquid Phase Epitaxy method from the PbO‐based flux. The aim of the work was to identify spectral bands, arising from lead‐induced centers of different types, and to clarify their influence on scintillation characteristics of Ce3+ centers. It was found that in the perovskite SCF studied, the concentration of single Pb2+‐based centers is comparatively small. In the SCF of garnets, in YAG SCF their concentration is considerably smaller than in LuAG SCF. The lead‐induced emission at about 3.1–3.2 eV excited around 3.9 eV was observed in all the SCF studied and ascribed to the dimer lead centers of the type of {Pb2+ – oxygen vacancy – Pb2+}. In Ce3+‐doped perovskite SCF, due to a strong overlap of the excitation band of the dimer centers and the emission band of Ce3+ centers, a considerable influence of dimer lead centers on the scintillation characteristics of these materials is expected. In the SCF of garnets, the influence of dimer lead centers on the characteristics of Ce3+ centers is negligible. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Luminescence of undoped LuAG and YAG crystals

Cited by 120 publications

References 9 publications

Optical spectroscopy of Ca3Sc2Si3O12, Ca3Y2Si3O12 and Ca3Lu2Si3O12 doped with Pr3+

Optical spectroscopy of Ca3Sc2Si3O12, Ca3Y2Si3O12 and Ca3Lu2Si3O12 doped with Pr3+

Atomistic and electronic structure of antisite defects in yttrium aluminum garnet: Density-functional study

Luminescence of dimer lead centers in aluminium perovskites and garnets

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