Growth and optimized scintillation properties of Ce:Li6Lu1-xYx(BO3)3 mixed crystals

Pan, Shangke; Liu, Wei; Ren, Guina; Zhang, Jianyu; Pan, Jianguo; Li, Nan; Wang, Zhi; Yuekun, Heng

doi:10.1016/j.jallcom.2018.07.200

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…The as-grown sample exhibits the distinctive absorption bands of Ce 3+ below 380 nm, corresponding with the 4f →5d j ( j = 1-4) intra-atomic transitions (marked with yellow arrows), which differs from the Ce 4+ -related broad absorption band reported for Ce:LYBO crystals doped with CeO 2 . 12,13,15,22) This clearly indicates that the original Ce 3+ valence from doping with CeF 3 could be preserved during the growth of present Ce:LYBO. The additional scattering from the host can be discerned by comparison with the as-grown undoped sample in Fig.…”

Section: Resultsmentioning

confidence: 77%

“…This broadband completely saturates before 50 h air-annealing and it is a clear feature of Ce 4+ predominance, as observed in the previous literature. 12,13,15,22) Therefore, air-annealing of Ce: LYBO significantly reduces both the scattering centers and the Ce 3+ activator concentration, the first effect taking place faster than the second one.…”

Section: Resultsmentioning

confidence: 99%

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Thermal neutron scintillation improvement in Ce:Li₆Y(BO₃)₃ single crystals by thermal treatment

Yuan

Vı́llora

Kawaguchi

et al. 2022

Jpn. J. Appl. Phys.

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Efficient, low-cost, and stable solid-state materials for portable thermal neutron detection are highly expected in order to substitute the currently used 3He and BF3 tank detectors. Li-glasses and halide compounds have emerged as candidates, however, they present critical drawbacks for practical implementations. Ce:Li6Y(BO3)3 is a promising oxide candidate that however has been disregarded due to its negligibly low light yield, caused by a poor crystalline and optical quality. In this study, we demonstrate that a post-growth thermal treatment is the key parameter to drastically reduce the concentration of intrinsic defects and scattering centers that lead to severe non-radiative recombination. Even though this annealing also involves the oxidation of activator Ce3+ ions to Ce4+, a drastic enhancement of the light yield by ~600% is achieved independently of the Ce3+ concentration within the considered range. The light yield of 4650 ph/n is already close to that of commercial GS20 with 6000 ph/n.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Thermal neutron scintillation improvement in Ce:Li₆Y(BO₃)₃ single crystals by thermal treatment

Yuan

Vı́llora

Kawaguchi

et al. 2022

Jpn. J. Appl. Phys.

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Impacts of 5d electron binding energy and electron–phonon coupling on luminescence of Ce³⁺ in Li₆Y(BO₃)₃

Zhou

Hou

et al. 2019

RSC Adv.

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In this work, the crystal structure and electronic structure as well as the synchrotron radiation vacuum ultravioletultraviolet-visible (VUV-UV-vis) luminescence properties of Li 6 Y(BO 3 ) 3 (LYBO):Ce 3+ phosphors were investigated in detail. The Rietveld refinement and DFT calculation reveal the P2 1 /c monoclinic crystal phase and the direct band gap of the LYBO compound, respectively. Only one kind of Ce 3+ 4f-5d transition is resolved in terms of the low temperature VUV-UV excitation, UV-vis emission spectra and luminescence decay curves. Furthermore, by constructing the vacuum referred binding energy (VRBE) scheme and applying the frequency-degenerate vibrational model, the impacts of 5d electron binding energy and electron-phonon coupling on luminescence of Ce 3+ in LYBO are analysed. The results show that the Ce 3+ emission in LYBO possesses a moderate intrinsic thermal stability. With the increase in concentration, the thermal stability of the emission gets worse due to the possible thermally-activated concentration quenching. In addition, the simulation of Ce 3+ emission profile at low temperature reveals that the 4f-5d electronic transitions of Ce 3+ ions can be treated to couple with one frequency-degenerate vibrational mode having the effective phonon energy of $257 cm À1 with the corresponding Huang-Rhys parameter of $6, which indicates a strong electron-phonon interaction of Ce 3+ luminescence in the Li 6 Y(BO 3 ) 3 host. Finally, the X-ray excited luminescence spectrum of the LYBO:5%Ce 3+ phosphor is measured to check the potential scintillator applications.

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Growth and optimized scintillation properties of Ce:Li6Lu1-xYx(BO3)3 mixed crystals

Cited by 2 publications

References 18 publications

Thermal neutron scintillation improvement in Ce:Li₆Y(BO₃)₃ single crystals by thermal treatment

Thermal neutron scintillation improvement in Ce:Li₆Y(BO₃)₃ single crystals by thermal treatment

Impacts of 5d electron binding energy and electron–phonon coupling on luminescence of Ce³⁺ in Li₆Y(BO₃)₃

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Growth and optimized scintillation properties of Ce:Li6Lu1-xYx(BO3)3 mixed crystals

Cited by 2 publications

References 18 publications

Thermal neutron scintillation improvement in Ce:Li6Y(BO3)3 single crystals by thermal treatment

Thermal neutron scintillation improvement in Ce:Li6Y(BO3)3 single crystals by thermal treatment

Impacts of 5d electron binding energy and electron–phonon coupling on luminescence of Ce3+ in Li6Y(BO3)3

Contact Info

Product

Resources

About

Thermal neutron scintillation improvement in Ce:Li₆Y(BO₃)₃ single crystals by thermal treatment

Thermal neutron scintillation improvement in Ce:Li₆Y(BO₃)₃ single crystals by thermal treatment

Impacts of 5d electron binding energy and electron–phonon coupling on luminescence of Ce³⁺ in Li₆Y(BO₃)₃