Tohoku University · 물리·천문학
Karol Bartosiewicz 교수의 연구실은 고성능 광학 소재, 특히 갈륨산염 기반 희토류 단결정 및 세라믹스를 중심으로 광변환, 지속형 발광, 열안정성 등 응용 기반의 신소재 개발을 주요 연구 분야로 삼고 있습니다. 원자 크기 불일치를 이용한 정밀한 발광 조절 기술과 고체상 다이어그램 제어를 통한 미세구조 제어 기법을 응용해, LED 및 레이저 기반 백색광 소스, 방사선 검출기, 다기능 센서 소재를 개발하고 있습니다. 특히, 단결정 성장, 다상 구조 제어, 불순물 도핑에 의한 물성 조작 등 다양한 합성 및 분석 기법을 융합한 연구를 수행하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
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
