【摘 要】
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We report a Si nanocrystal thin film consisting of free-standing Si nanocrystals,which can emit white light and show positive optical gains for its red,green and blue(RGB)components under ultraviolet
【机 构】
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Department of Optical Science and Engineering,and Shanghai Ultra- Precision Optical Manufacturing En
【出 处】
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第十一届全国硅基光电子材料及器件研讨会
论文部分内容阅读
We report a Si nanocrystal thin film consisting of free-standing Si nanocrystals,which can emit white light and show positive optical gains for its red,green and blue(RGB)components under ultraviolet excitation.The Si nanocrystals with φ=2.31±0.35 nm were prepared by chemical etching of Si powder,followed by filtering.After being mixed with SiO2 sol-gel and thermally annealed,a broadband photoluminescence(PL)from the thin film was observed.The RGB ratio of the PL can be tuned by changing the annealing temperature or atmosphere,which is 1.00/3.26/4.59 for the pure white light emission.The origins of the PL components were attributed to differences in oxygen-passivation degree for Si nanocrystals.The results may find applications in whitelight Si lasing and Si lighting.
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