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Logo 22nd ISBC & 20th ISLS


Field-induced luminescence in organic and inorganic media, OLEDs, and LEDs

Novel sub-eutectic engineering for luminescence and photoconversion control in Tb3Al5-xScxO12:Ce crystals

Karol Bartosiewicz1, Robert Tomala2, Justyna Zeler3, Damian Szymanski2, Masao Yoshino4, Takahiko Horiai4, Paweł Socha5, Shunsuke Kurosawa4, Kei Kamada4, Eugeniusz Zych3, Akira Yoshikawa4

1Faculty of Physics, Kazimierz Wielki University, Powstańców Wielkopolskich street 2, 85-090 Bydgoszcz, 2Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland, 3Faculty of Chemistry, University of Wrocław, Joliot-Curie Street 14 F, 50383 Wrocław, Poland, 4Institute for Materials Research, Tohoku University, 2-1-1 Katahira Aoba-ku, Sendai, Miyagi 9808577, Japan, 5Łukasiewicz Research Network - Institute of Microelectronics and Photonics, Aleja Lotników 32/46, 02-668, Warsaw, Poland

E-mail: karol@ukw.edu.pl

A comprehensive evaluation of the structural and property relationships in Tb3Al5O12:Ce3+ upon partial substitution of Al with Sc atoms was conducted. The inherently thermodynamically unstable Tb3Al5O12 in the form of single crystal readily decomposed into a mixture of secondary phases [1]. However, Sc incorporation demonstrably enhanced the stability of the resulting Tb3Al5-xScxO12:Ce phase, enabling its successful crystallization from the melt [2]. Systematic variation of the Sc concentration in Tb3Al5-xScxO₁₂:Ce crystals enabled the precise control of the composition and morphology of the secondary phase inclusions. At low Sc concentrations, these inclusions were primarily composed of TbAlO₃:Ce. As the Sc concentration increased, the secondary phase composition transitioned to TbScO₃:Ce. This observation suggested that Sc ions effectively replace Al ions in the secondary phase lattice, leading to a progressive compositional shift and forming garnet-perovskite sub-eutectic composition. Temperature dependence studies revealed that the rate of the energy transfer processes between Tb3+ and Ce3+ was governed by Sc3+ ions concentration [3]. This modulation of Sc concentration enabled the tailoring of photoconverting parameters, including correlated color temperature (CCT), color rendering index (CRI), and luminous efficacy (LE). Sc incorporation also influenced the thermal stability of Ce3+ ions luminescence [4]. References:[1] S. Ganschow, D. Klimm, et al., Cryst. Res. Technol. 34 (1999) 615–619. [2] O. Zapadlík, J. Pejchal, et al., J. Lumin. 263 (2023) 119984. [3] O. Zapadlík, J. Pejchal, et al., Cryst. Growth Des. 21 (2021) 7139–7149. [4] A. Markovskyi, K. Bartosiewicz, et al., Mater. Sci. Eng. B 273 (2021) 115395.

Keywords: single crystal, photoconversion parameters, Energy transfer modulation, Garnet-perovskite eutectic

Acknowledgments: This work was supported by the National Science Centre Poland (NCN) No.: 2020/39/D/ST3/02711

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