Tohoku University · Physics and Astronomy
Professor Karol Bartosiewicz's research lab specializes in the design, synthesis, and characterization of rare-earth and transition-metal doped garnet scintillators and phosphors for advanced optoelectronic applications. The lab focuses on understanding and manipulating crystal growth, defect engineering, and local lattice distortions to tailor luminescence, scintillation efficiency, and thermal stability in materials such as YAG:Ce, TbAG:Ce, and Lu-based garnets. Key research directions include atomic-scale doping strategies, phase stability under compositional stress, and the role of ionic size and charge mismatch in influencing structural and optical properties.
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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