Abstract

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 Eu³⁺ and Yb³⁺ 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 Eu³⁺ ions assisted by efficient sensitizer Yb³⁺ ions in nanocrystals under 980 nm excitation. The confocal microscope revealed the depth profile of Eu³⁺ ions by showing their emission intensity variation.

© 2018 Optical Society of Korea

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