Tunneling process in thermally stimulated luminescence of mixed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Lu</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Y</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="norm

Vedda, A.; Martini, M.; Meinardi, F.; Chval, J.; Dušek, Michal; Mareš, J.; Mihóková, E.; Nikl, M.

doi:10.1103/physrevb.61.8081

Cited by 73 publications

(38 citation statements)

References 27 publications

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“…1), the decay kinetics of Ce 3+ emission in YAP:Ce and LuYAP:Ce SC possesses the large contribution of slow components resulting from the non-radiative energy transfer between the defect-related centers and Ce 3+ ions (Zorenko et al, 2007a,b). Another reason for the slow components presence can be an intermediate temporary localization of charge carriers at AD or VD acting as trapping centers Vedda et al, 2000;. For SC of perovskites as compared to garnet SC (Zorenko et al, 2007a,b) substantially smaller contribution of slow components in scintillation decay is found basing on the value of K S (Table 1).…”

Section: Discussionmentioning

confidence: 98%

“…Among them, the Y Al and Lu Al antisite defects (AD) and vacancy-type defects (VD) are of particular importance for their scintillation performance (Nikl, 2005, Zorenko et al, 2004a. AD and VD can often create parent sites for electron or hole capture which usually degrade light yield (LY) and timing characteristics of the scintillators , Vedda et al, 2000.…”

Section: Introductionmentioning

confidence: 99%

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Peculiarities of luminescence and scintillation properties of YAP:Ce and LuAP:Ce single crystals and single crystalline films

Zorenko

Gorbenko

Konstankevych

et al. 2007

Radiation Measurements

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Luminescent properties and the energy transfer from host to Ce 3+ ions are analyzed in single crystalline films (SCF) of YAlO 3 :Ce (YAP:Ce), Y 1−x Lu x AP:Ce (YLuAP:Ce) and LuAlO 3 :Ce (LuAP:Ce) perovskites in comparison with their single crystal (SC) analogues using the timeresolved luminescence spectroscopy under synchrotron radiation excitation. It is shown that the main peculiarity of luminescent properties of YAP:Ce, YLuAP:Ce and LuAG:Ce SCF is determined by the extremely low concentration of Y Al and Lu Al antisite defects and vacancy-type defects in SCF as compared to SC. The advantages of phosphors based on (Y-Lu)AP:Ce SCF are due to the absence of emission and trapping centers in these SCF which are connected with the above mentioned bulk crystal defects.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Peculiarities of luminescence and scintillation properties of YAP:Ce and LuAP:Ce single crystals and single crystalline films

Zorenko

Gorbenko

Konstankevych

et al. 2007

Radiation Measurements

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“…The same arguments can be used also in the case of perovskite samples. Moreover, the electron traps responsible for the TSL glow peaks above RT were ascribed to the oxygen vacancies in the single crystals of YAP:Ce [23] and the existence of F + centres in YAP was confirmed also by the EPR measurements [22]. The similarity of the peak positions in the TSL glow curves of SC and SCF systems in both the aluminium perovskites and garnets doped with Ce 3+ demonstrates that impurity ions embedded in the samples due to the particular production technology do not give rise to electron traps.…”

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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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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“…First of all, it is still unclear whether the traps are related to host defects, the trivalent codopant, or a combination of both [15][16][17]. Different opinions also exist on the trapping and detrapping routes, regarding the role of the conduction band and whether tunneling processes also play a role [18,19]. Although several research approaches are available to study the trapping and detrapping processes, the reports in literature commonly consider only one or two of the following aspects of the trapping process in sufficient detail.…”

Section: Introductionmentioning

confidence: 99%

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

2014

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SrAl 2 O 4 :Eu,Dy is presumably the best known persistent luminescent phosphor. At room temperature, its green emission remains visible for hours after switching off the excitation. It is known that upon lowering the temperature of the phosphor a second photoluminescence emission band arises in the blue part of the visible spectrum, although its origin is still the subject of discussion. In this paper we thoroughly study the origin of both emission bands in SrAl 2 O 4 :Eu,Dy and we attribute this to europium ions substituting for the two different Sr sites in the phosphor's monoclinic host lattice. The photoluminescence properties, the thermal quenching behavior, and photoluminescence lifetime of both emission bands are investigated. A lanthanide energy level scheme is constructed for both sites. Using an integrated approach, i.e., combining charging, afterglow, and thermoluminescence measurements in the same run, we study the charging or trap filling processes in SrAl 2 O 4 :Eu,Dy upon excitation with site selective excitation wavelengths and at different temperatures. We show that trap filling is a thermally activated process when the green emitting center is excited at 435 nm.Furthermore, we also demonstrate that the distribution of filled traps after charging depends strongly on the excitation wavelength and thus on which Eu 2+ center has been excited. This suggests trapping of the electron close to the ionized Eu 2+ ion, without full delocalization to the conduction band during the trapping process. Finally, the quantum efficiency of the persistent luminescence is estimated at 65 (+/−10)%.

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Tunneling process in thermally stimulated luminescence of mixedLuxY1−x
A. Vedda
¹
,
M. Martini
²
,
F. Meinardi
³

et al.

Cited by 73 publications

References 27 publications

Peculiarities of luminescence and scintillation properties of YAP:Ce and LuAP:Ce single crystals and single crystalline films

Peculiarities of luminescence and scintillation properties of YAP:Ce and LuAP:Ce single crystals and single crystalline films

Luminescence of dimer lead centers in aluminium perovskites and garnets

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

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Tunneling process in thermally stimulated luminescence of mixedLuxY1−xA. Vedda1, M. Martini2, F. Meinardi3 et al.

Cited by 73 publications

References 27 publications

Peculiarities of luminescence and scintillation properties of YAP:Ce and LuAP:Ce single crystals and single crystalline films

Peculiarities of luminescence and scintillation properties of YAP:Ce and LuAP:Ce single crystals and single crystalline films

Luminescence of dimer lead centers in aluminium perovskites and garnets

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

Contact Info

Product

Resources

About

Tunneling process in thermally stimulated luminescence of mixedLuxY1−x
A. Vedda
¹
,
M. Martini
²
,
F. Meinardi
³

et al.