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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2018.2
- 수록면
- 79 - 84 (6page)
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초록· 키워드
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We present a novel and simple method to enable spatially selective ZnAl₂O₄ nanocrystal formation on the surface of B₂O₃-Al₂O₃-ZnO-CaO-K₂O glass by employing localized laser heating. Optimized precipitation of glass-ceramics containing nanocrystals doped with Eu<SUP>3+</SUP> and Yb<SUP>3+</SUP> ions was performed by controlling CO₂ laser power and scan speed. Micro-x-ray diffraction and transmission electron microscopy revealed the mean size and morphology of nanocrystals, and energy dispersive x-ray spectroscopy showed the lateral distribution of elements in the imaged area. Laser power and scan speed controled annealing temperature for crystalization in the range of 1.4-1.8 W and 0.01-0.3 mm/s, and changed the size of nanocrystals and distribution of dopant ions. We also report more than 20 times enhanced downshift visible emission under ultraviolet excitation, and 3 times increased upconversion emission from Eu<SUP>3+</SUP> ions assisted by efficient sensitizer Yb<SUP>3+</SUP> ions in nanocrystals under 980 nm excitation. The confocal microscope revealed the depth profile of Eu<SUP>3+</SUP> ions by showing their emission intensity variation.
목차
I. INTRODUCTION
II. EXPERIMENTAL
III. RESULTS AND DISCUSSION
IV. CONCLUSION
REFERENCES
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UCI(KEPA) : I410-ECN-0101-2023-425-000232547