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Open AccessArticle

Scintillation and Energy-Storage Properties of Micro-Pulling-Down Grown Crystals of Sc3+- and La3+-Doped YAlO3 Perovskite

1
Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, PL31342 Krakow, Poland
2
Physical Faculty Ivan Franko National University in Lviv, Lomonosov 11, 79005 Lviv, Ukraine
3
Institute of Physics, Kazimierz Wielki University in Bydgoszcz, Powstańców Wielkopolskich 2, PL85090 Bydgoszcz, Poland
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(5), 385; https://doi.org/10.3390/cryst10050385
Received: 7 April 2020 / Revised: 3 May 2020 / Accepted: 7 May 2020 / Published: 8 May 2020
(This article belongs to the Special Issue Crystals, Films and Nanocomposite Scintillators (Volume II))
The scintillation and energy-storage properties of YAlO3 (YAP) crystals doped with Sc3+ and La3+ isoelectronic dopants were investigated in this work. The YAP:Sc and YAP:La crystals were grown from the melt with a nominal Sc and La content in the 0.2–5.0 mol.% range using the novel micro-pulling-down method. We found that the segregation coefficient of Sc ions in YAP:Sc (0.2–1.0 mol.%) crystals is about of 0.35–0.4 and decreases to around 0.2 at Sc content of 5.0 mol.% when the segregation coefficient of La ions in YAP:La (1.0–5.0 mol.%) crystals is 0.008–0.01. The scintillation and stimulated luminescence phenomena, like thermo- and photoluminescence, were utilized for the property characterization of the studied materials. The cathodoluminescence and X-ray-excited luminescence were used for the imitation of scintillation in the YAP:Sc and YAP:La crystals. The influence of Sc3+ and La3+ dopant concentration on the CL and RL emission spectra, as well as the shape of the measured thermoluminescence (TL) glow-curves, was also investigated. The measured emission spectra showed dominant emission of Sc3+ and La3+ ions in the UV range. For this reason, the YAP:Sc and YAP:La crystals can be considered for creation of ultraviolet (UV)-emitting scintillators. For the undoped YAlO3 crystals, the main TL emission peak occurs in a low-temperature range at 375 K. Meanwhile, even a small addition of dopants causes a strong suppression of luminescence of the YAP host and high-temperature peaks become dominant in the TL glow-curves of YAP:Sc and YAP:La crystals. Moreover, the amplitude of emission does not change monotonically with increasing dopant content. The kinetic parameters of emission were also evaluated, and the first-order behavior was confirmed in all cases. The dosimetric properties of investigated materials such as dose response, fading rate, and the lowest measurable dose are also discussed. The obtained results tend to suggest that the YAlO3 perovskite host, apart from its application for the development of efficient scintillators, may also be considered as a promising matrix for the creation of energy-storage phosphors for dosimetric applications. View Full-Text
Keywords: micro-pulling-down; perovskite; stimulated luminescence phenomena; scandium; lanthanum; energy-storage properties micro-pulling-down; perovskite; stimulated luminescence phenomena; scandium; lanthanum; energy-storage properties
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Gieszczyk, W.; Mrozik, A.; Bilski, P.; Vistovskyy, V.; Voloshinovskii, A.; Paprocki, K.; Zorenko, T.; Zorenko, Y. Scintillation and Energy-Storage Properties of Micro-Pulling-Down Grown Crystals of Sc3+- and La3+-Doped YAlO3 Perovskite. Crystals 2020, 10, 385.

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