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.

中文翻译：

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Sc3 +和La3 +掺杂YAlO3钙钛矿微拉长生长晶体的闪烁和储能特性

掺Sc ³⁺和La ³⁺的YAlO ₃（YAP）晶体的闪烁和储能性能等电子掺杂剂在这项工作中进行了研究。使用新颖的微拉法，从熔体中生长出YAP：Sc和YAP：La晶体，其标称Sc和La含量在0.2-5.0 mol。％范围内。我们发现，YAP：Sc（0.2–1.0 mol。％）晶体中Sc离子的偏析系数约为0.35–0.4，而当Y离子中La离子的偏析系数为5.0 mol。％时，Sc离子的偏析系数降低至0.2左右。 ：La（1.0–5.0 mol。％）晶体为0.008–0.01。利用闪烁和受激发光现象（如热和光致发光）来表征研究材料的性能。阴极发光和X射线激发的发光用于模仿YAP：Sc和YAP：La晶体中的闪烁。Sc ³⁺和La ^3+的影响还研究了CL和RL发射光谱上的掺杂剂浓度以及测得的热致发光（TL）辉光曲线的形状。测得的发射光谱显示在紫外线范围内Sc ³⁺和La ³⁺离子占主导地位。因此，可以考虑使用YAP：Sc和YAP：La晶体来产生发射紫外线（UV）的闪烁体。对于未掺杂的YAlO ₃在晶体中，主要的TL发射峰出现在375 K的低温范围内。同时，即使少量添加掺杂剂也能强烈抑制YAP主体的发光，高温峰在TL的辉光曲线中占主导地位。 YAP：Sc和YAP：La晶体。此外，发射的幅度不会随着掺杂物含量的增加而单调变化。还评估了排放的动力学参数，并在所有情况下均确认了一级行为。还讨论了所研究材料的剂量特性，例如剂量响应，褪色率和最低可测量剂量。所得结果倾向于表明YAlO ₃ 钙钛矿基质，除了其在开发高效闪烁体中的应用外，还可以被认为是产生用于剂量学应用的储能磷光体的有希望的基质。