Thermoluminescence investigation of donor (Ce<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>, Pr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>, Tb<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mrow><m

You, Fangtian; Bos, A.J.J.; Shi, Qiufeng; Huang, Shihua; Dorenbos, P.

doi:10.1103/physrevb.85.115101

Cited by 68 publications

(16 citation statements)

References 36 publications

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“…A typical TL spectrum contains an asymmetric broadband ranging from 90 to 290 K and peaking at ~135 K, indicating that the traps are distributed over a wide range of energies below the host conduction band in h -EAO. According to previous studies202122, the delocalization energy of the excited electron at 77 K can be determined from the TL creation spectrum, i.e., the plot of TL integrated intensities versus the illumination wavelengths, as shown by the red ball curve in Fig. 3b (Note that the effect of thermally activated ionization is eliminated at 77 K).…”

Section: Resultsmentioning

confidence: 99%

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New localized/delocalized emitting state of Eu2+ in orange-emitting hexagonal EuAl2O4

Liu

Meltzer

et al. 2014

Sci Rep

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Eu2+-activated phosphors are being widely used in illuminations and displays. Some of these phosphors feature an extremely broad and red-shifted Eu2+ emission band; however, convincing explanation of this phenomenon is lacking. Here we report a new localized/delocalized emitting state of Eu2+ ions in a new hexagonal EuAl2O4 phosphor whose Eu2+ luminescence exhibits a very large bandwidth and an extremely large Stokes shift. At 77 K, two luminescent sites responsible for 550 nm and 645 nm broadband emissions are recognized, while at room temperature only the 645 nm emission band emits. The 645 nm emission exhibits a typical radiative lifetime of 1.27 μs and an unusually large Stokes shift of 0.92 eV. We identify the 645 nm emission as originating from a new type of emitting state whose composition is predominantly that of localized 4f65d character but which also contains a complementary component with delocalized conduction-band-like character. This investigation provides new insights into a unique type of Eu2+ luminescence in solids whose emission exhibits both a very large bandwidth and an extremely large Stokes shift.

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Section: Resultsmentioning

confidence: 99%

“…3b also contains a higher energy threshold at ~420 nm. The strong electron delocalization in the high-energy region (i.e., 320−420 nm) can be attributed to the autoionizing intermediate states, i.e., the autoionization of 4 f 6 5 d states lying in the host conduction band202122.…”

Section: Discussionmentioning

confidence: 99%

New localized/delocalized emitting state of Eu2+ in orange-emitting hexagonal EuAl2O4

Liu

Meltzer

et al. 2014

Sci Rep

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“…LuAG:Ce 3+ are widely used as fast scintillators. There are many publications relating to optical, luminescent, and thermoactivation characteristics of LuAG:Ce 3+ 43–48. The realization of all the three mechanisms of radiation damage, considered in introduction, is expected in LuAG crystals with high values of mass ratio (Lu/O = 11 and Lu/Al = 6.5) under conditions of superhigh excitation density.…”

Section: Resultsmentioning

confidence: 99%

On the mechanisms of radiation damage and prospects of their suppression in complex metal oxides

Lushchik

Nagirnyi

et al. 2013

Physica Status Solidi (b)

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The influence of some impurity ions on the increase/decrease in the resistance against irradiation of metal oxides with X‐rays and electrons (low‐dense excitation) or ∼2 GeV Au198 and U238 ions providing a superhigh density of electronic excitations along cylindrical tracks (LET > 30 keV nm−1) has been investigated for fcc MgO single crystals with close ion masses or Lu3Al5O12 and Gd2SiO5 with large unit cells and heavy cations. The radiation effects have been studied using the methods of low‐temperature vacuum ultraviolet spectroscopy (up to 40 eV), cathodoluminescence and thermoactivation spectroscopy. The step‐by‐step annealing of the radiation‐induced absorption, scattering, and luminescence has been performed at the heating of irradiated crystals up to ∼70% of a melting point. Possible experimental manifestations of the temperature‐stable nanosize 3D defects created, according to theoretical predictions, via rearrangement of many host ions at the collapse of discrete solitons (breathers) are detected in Lu3Al5O12 and Gd2SiO5 crystals irradiated with swift heavy ions (fluence of 1012 ions cm−2).

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“…If we replace Ce 3+ in this host material by Pr 3+ with lanthanides as codopants, the same results are obtained with Pr 3+ as the luminescent center [31]. A similar study on the energy level positions was performed on GdAlO 3 :Ce 3+ ,Ln (Ln = Pr, Er, Nd, Ho, Dy, Tm) (see Figure 7) and lanthanides in Y 3 Al 5 O 12 [66], LuPO 4 [67], and Sr 3 AlSi 1− x O 5 [68]. In all those cases, the position of the maximum of the glow peak could be connected to the trap depth.…”

Section: Thermoluminescence As a Research Toolmentioning

confidence: 65%

Thermoluminescence as a Research Tool to Investigate Luminescence Mechanisms

Bos

2017

Materials

231

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Thermally stimulated luminescence (TSL) is known as a technique used in radiation dosimetry and dating. However, since the luminescence is very sensitive to the defects in a solid, it can also be used in material research. In this review, it is shown how TSL can be used as a research tool to investigate luminescent characteristics and underlying luminescent mechanisms. First, some basic characteristics and a theoretical background of the phenomenon are given. Next, methods and difficulties in extracting trapping parameters are addressed. Then, the instrumentation needed to measure the luminescence, both as a function of temperature and wavelength, is described. Finally, a series of very diverse examples is given to illustrate how TSL has been used in the determination of energy levels of defects, in the research of persistent luminescence phosphors, and in phenomena like band gap engineering, tunnelling, photosynthesis, and thermal quenching. It is concluded that in the field of luminescence spectroscopy, thermally stimulated luminescence has proven to be an experimental technique with unique properties to study defects in solids.

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Thermoluminescence investigation of donor (Ce3+, Pr3+, Tb

Cited by 68 publications

References 36 publications

New localized/delocalized emitting state of Eu2+ in orange-emitting hexagonal EuAl2O4

New localized/delocalized emitting state of Eu2+ in orange-emitting hexagonal EuAl2O4

On the mechanisms of radiation damage and prospects of their suppression in complex metal oxides

Thermoluminescence as a Research Tool to Investigate Luminescence Mechanisms

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