Polarization of luminescence of colour centres in YAG crystals

Spriņǵis, M.; Pujats, A.; Valbis, J. A.

doi:10.1088/0953-8984/3/28/021

Cited by 54 publications

(35 citation statements)

References 8 publications

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“…The latter emission is present also in LuAG SC. In the decay kinetics of this emission, the fast component with τ = 3.14 ns prevails at 11 K. Most probably, this emission arises from F + centers [20] which points to the existence of oxygen vacancies in both SC and SCF LuAG samples under study.…”

Section: Luminescence Of Yag and Luag Single Crystalline Filmsmentioning

confidence: 82%

“…The existence of F + centers in the isostructural YAG host was considered to be the cause of the absorption and emission bands at 3.4 eV and 3.1 eV, respectively [20], even though no convincing evidence about oxygen vacancy-related electron traps in aluminium garnets was found e.g. in an EPR experiment [22].…”

Section: Tsl Of the Ce-doped Yap And Luag Above Room Temperature Inmentioning

confidence: 99%

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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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Section: Luminescence Of Yag and Luag Single Crystalline Filmsmentioning

confidence: 82%

Section: Tsl Of the Ce-doped Yap And Luag Above Room Temperature Inmentioning

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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“…It should be noted that YAG single crystals, isostructural to LuAG, exhibit luminescence of F + (400 nm) [16] and F (460 nm) centers in the range 350-500 nm [17]. The corresponding luminescence excitation peaks for these centers are at 3.44, 5.16 (F + ), and 6.2 (F) eV [13,14].…”

Section: Resultsmentioning

confidence: 99%

“…The corresponding luminescence excitation peaks for these centers are at 3.44, 5.16 (F + ), and 6.2 (F) eV [13,14]. Therefore, by analogy with the luminescence of YAG single crystals [16,17] the 2.76-eV luminescence band of LuAG single crystals can be assigned to the luminescence of F centers. This suggestion is confirmed by the proximity of the luminescence band of F centers in YAG (2.76 eV) and the band at 2.7 eV in LuAG single crystals, as well as by the absence of this band in the luminescence spectra of single-crystal LuAG films (Fig.…”

Section: Resultsmentioning

confidence: 99%

Luminescence spectroscopy of excitons and antisite defects in Lu3Al5O12 single crystals and single-crystal films

et al. 2008

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-The nature of the intrinsic luminescence of the lutetium aluminum garnet Lu 3 Al 5 O 12 (LuAG) has been analyzed on the basis of time-resolved spectral kinetic investigations upon excitation of two model objects, LuAG single crystals and single-crystal films, by pulsed X-ray and synchrotron radiations. Due to the differences in the mechanisms and methods of crystallization, these objects are characterized by significantly different concentrations of Lu Al antisite defects. The energy structure of luminescence centers in LuAG single crystals (self-trapped excitons (STEs), excitons localized near antisite defects, and Lu Al antisite defects) has been established. For single-crystal LuAG films, grown by liquid-phase epitaxy from a Pb-containing flux, the energy parameters of the following luminescence centers have been determined: STEs in regular (unperturbed by the presence of antisite defects) sites of the garnet lattice and excitons localized near Pb 2+ ions. The structure of the luminescence centers, related to the background emission of impurity Pb 2+ ions, has also been established in the UV and visible ranges. It is suggested that, in contrast to the two-halide hole self-trapping, a self-trapped state similar to STEs in simple oxides ( Al 2 O 3 , Y 2 O 3 ) is formed in LuAG; this state is formed by self-trapped holes in the form of singly charged O -ions and electrons localized at excited levels of Lu 3+ cations. PACS numbers: 78.55.-m

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“…F þ centers in YAG crystals with oxygen vacancies are known to have absorption bands around 235 nm and 370 nm. 22 These centers, on the other hand, are completely eliminated when the YAG crystals are annealed in air. As our samples were annealed in air prior to the irradiation experiments, oxygen vacancies are not expected.…”

Section: Uv Irradiation Of Rhenium Grown Yb:yagmentioning

confidence: 99%

Charge transfer processes and ultraviolet induced absorption in Yb:YAG single crystal laser materials

Rydberg¹,

Engholm²

2013

Journal of Applied Physics

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Charge transfer (CT) transitions and UV induced color centers in Yb:YAG single crystals have been investigated. A simultaneous pair formation of a stable Yb 2þ ion and a hole related ðO À Þ color center (hole polaron) are observed through a CT-process. Slightly different types of hole related color centers are formed in Yb:YAG crystals containing small levels of iron impurities. Furthermore, excitation spectroscopy on the UV irradiated Yb:YAG samples could confirm an energy transfer process between Yb 3þ and Yb 2þ ions. The findings are important for an increased knowledge of the physical loss mechanisms observed in Yb-doped laser materials, such as the nonlinear decay process in Yb:YAG crystals as well as the photodarkening phenomenon in Yb-doped fiber lasers. V C 2013 AIP Publishing LLC. [http://dx

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Polarization of luminescence of colour centres in YAG crystals

Cited by 54 publications

References 8 publications

Luminescence of dimer lead centers in aluminium perovskites and garnets

Luminescence of dimer lead centers in aluminium perovskites and garnets

Luminescence spectroscopy of excitons and antisite defects in Lu3Al5O12 single crystals and single-crystal films

Charge transfer processes and ultraviolet induced absorption in Yb:YAG single crystal laser materials

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