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采用溶胶-凝胶法合成了半导体PbS量子点掺杂的Na2O-B2O3-SiO2玻璃,研究了不同热处理工艺对玻璃结构的影响,利用多种表征手段研究了量子点掺杂玻璃中的微晶结构及其光学性能.孔径分析结果表明随着热处理温度的升高玻璃内部孔径不断减小,最终孔结构几乎完全消失;红外光谱分析表明玻璃网络结构在较低温度下己经形成,随温度的升高不断密实化;X射线光电子能谱证明了玻璃中存在PbS,高分辨透射电镜表征了玻璃基质中掺杂的微晶结构是PbS,统计计算表明,玻璃中微晶的平均粒径尺寸为3.5nm;吸收光谱分析发现,微晶掺杂玻璃的吸收边界较PbS的块体材料发生了明显的蓝移,产生了量子尺寸效应;通过Z扫描技术测得其非线性折射率γ为-2.03×10-14cm2/GW.
The PbS quantum dots doped Na 2 O-B 2 O 3 -SiO 2 glass was synthesized by sol-gel method. The effects of different heat treatment processes on the glass structure were investigated. The microcrystal structure in QDs was investigated by various characterization methods And their optical properties.The results of pore size analysis showed that the internal pore size decreases with the increase of the heat treatment temperature and the final pore structure disappears almost completely.The infrared spectrum shows that the network structure of glass has been formed at lower temperature, High-density continuous solidification; X-ray photoelectron spectroscopy proved that the presence of PbS glass, high-resolution transmission electron microscopy characterization of the glass substrate doped microcrystalline structure is PbS, the statistical calculations show that the average size of the glass particles in the glass is 3.5 nm; Absorption spectrum analysis shows that the absorption boundary of the microcrystalline doped glass is obviously blue-shifted compared with the bulk material of PbS, and the quantum size effect is produced. The nonlinear refractive index γ measured by Z-scan technique is -2.03 × 10-14 cm2 / GW.