東北大学 · 物理学・天文学
カロル・バールトシエヴィッチ教授の研究室では、ガーネット系酸化物半導体を基盤とした新規発光材料の設計・合成と、その応用技術の開発を主な研究テーマとしています。特に、イットリア系やランタニドドープガーネット結晶における不等価不準位子の導入がもたらす構造的・光学的影響を精密に制御し、高効率な光変換・閃光特性を持つ新素材の創出を目指しています。また、溶融法を用いた高品質単結晶の成長技術開発も進めており、LEDやレーザー駆動白色光源、放射線検出器への応用が期待されています。
Figures are computed from collected data and may differ slightly.
Transparent light-converting ${\mathrm{Y}}_{3}{\mathrm{Al}}_{5}{\mathrm{O}}_{12}:\mathrm{Ce}$ (YAG:$\mathrm{Ce}$) ceramics have become promising materials for advanced light-emitting diode and laser-driven white-light-generation technology. However, their functionality is highly dependent on factors such as structural quality, uniformity of dopant distribution, the presence of defects, and the cost of fabrication. The emission of YAG:$\mathrm{Ce}$ ceramics remains thermally stable when high-powe
This research deals with a novel approach for the self‐flux growth of Tb 3 Al 5 O 12 :Ce single crystal using the micro‐pulling‐down method. The self‐flux method enables the fabrication of the crystals with excellent photoconversion and scintillation properties. Tb 3 Al 5 O 12 :Ce (TbAG:Ce) efficiently converts the blue light‐emitting diode (LED) radiation into bright white light. The gradual change of crystal thicknesses (0.2–1 mm) allows for tuning white light temperature from cold to neutral
Persistent luminescence in Lu 3 Al 2 Ga 2 O 12 :Ce,La crystal was studied. La codoping elongated luminescence and increased trapping centers. The influence of La on crystal growth, structure, and Al/Ga sublattices was analyzed.
This research revealed the response of Ga and Al sublattices to the incorporation of mismatching substituents in Gd3Al2Ga3O12:Ce single crystals. Incompatible in size and charge, Li+ and Mg2+ substituents violated configurational entropy. This led to lattice distortion and triggered structural rearrangements. The radial fluctuation of the Ga and Al elements was proven by multi-elemental energy-dispersive X-ray spectroscopy mapping and elemental composition analysis. Further evidence was observed
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