多色荧光硅纳米颗粒的制备以及在白光LED光转换层中的基础应用研究

发布时间：2018-05-19 05:20

本文选题：荧光硅纳米颗粒 + 荧光可调　；参考：《苏州大学》2015年硕士论文

【摘要】：近年来,小尺寸(2.5-5 nm)荧光硅纳米颗粒因其独特的光学性质(如,强且稳定的荧光)和良好的生物相容性,被广泛研究并用于光学应用。本文中,利用荧光硅纳米颗粒作为新型光转换器,我们介绍了一种基于小尺寸(~3.7 nm)荧光硅纳米颗粒的光转换器用于构建新型白光发光二极管(light-emitting diodes,LEDs)。我们优化了之前报道的微波辅助合成荧光硅纳米颗粒的方法,通过调控反应前体溶液的p H值(从碱性调整到酸性),制备得到光色可调的荧光硅纳米颗粒(从蓝光到黄绿光),最大发射波长从454 nm调整到545 nm。特别地,在前体溶液p H值为4条件下制备得到的荧光硅纳米颗粒呈现黄绿色荧光,且发射峰较宽,适合于白光光谱的构建。进一步地,我们将其作为光转换器并用于构建白光LED。制备得到的LED的流明效率为13 lm/W,CIE(Commission Internationale de l'Eclairage)指数为(0.3041,0.3129),CRI(Color Rendering Index)指数为82,色温指数为7982 K。
[Abstract]:In recent years, fluorescent silicon nanoparticles with small size (2.5-5 nm) have been widely studied and used in optical applications because of their unique optical properties (such as strong and stable fluorescence) and good biocompatibility. In this paper, using fluorescent silicon nanoparticles as a new type of optical converter, we introduce an optical converter based on small size (3.7 nm) fluorescent silicon nanoparticles to construct a new type of white light-emitting diode light-emitting diodes (LEDs). We optimized the microwave assisted synthesis of fluorescent silicon nanoparticles previously reported. By adjusting the pH value of the reaction precursor solution (from alkaline to acidic), the photochromatic and tunable fluorescent silicon nanoparticles (from blue light to yellowish green light) were prepared. The maximum emission wavelength was adjusted from 454 nm to 545 nm. In particular, when the pH value of precursor solution is 4, the fluorescent silicon nanoparticles exhibit yellowish green fluorescence, and the emission peak is wide, which is suitable for the construction of white light spectrum. Further, we use it as an optical converter and to build a white LED. The lumen efficiency of the prepared LED is 13lm / W ~ (-1) Internationale de lcloirage) index is 0.3041 ~ 0.3129C ~ (3 +) Rendering index is 82, and the color temperature index is 7982 K.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN312.8;TB383.1

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