Binary nanocrystalline rare-earth hexaboride is regarded as one of the promising optical absorption materials that possess the high transparency for visible light and the strong absorption for NIR due to the effects of localized surface plasmon resonance. In present work, we experimentally investigated the structural and optical absorption of ternary nanocrystalline Eu-doped SmB₆ powder. As a result, it is found that the reaction temperature as an important factor not only refines the grain size, but also improves the powder dispersion of synthesized samples. The optical absorption results reveal that the transmittance wavelength of nanocrystalline SmB₆ increases from 696 nm to exceeding 1000 nm with the Eu doping content increasing to x = 0.8. Theoretically, in order to study the transmittance wavelength tunable mechanisms of nanocrystalline Eu-doped SmB₆, the electronic structure, density of states and energy loss function were calculated by first-principle calculation. It shows that the Eu²⁺ doping into SmB₆ effectively reduces the plasma frequency excitation energy from 1.48 to 1.25 eV and leads to the transmittance wavelength redshift toward a higher wavelength. Based on above meaningful studies, present work is helpful for extension of optical applications of nanocrystalline SmB₆ powder.

由于局域表面等离子体共振的影响，二元纳米晶六硼化稀土被认为是一种很有前途的光吸收材料，它对可见光具有高透明度，对近红外光具有强吸收。在目前的工作中，我们通过实验研究了三元纳米晶 Eu 掺杂的 SmB ₆粉末的结构和光学吸收。结果发现，反应温度作为一个重要因素，不仅细化了晶粒尺寸，而且改善了合成样品的粉末分散性。光吸收结果表明，随着Eu掺杂量增加到x，纳米晶SmB ₆的透射波长从696 nm增加到超过1000 nm = 0.8。理论上，为了研究纳米晶Eu掺杂SmB ₆的透射波长可调机制，通过第一性原理计算计算了电子结构、态密度和能量损失函数。结果表明，掺杂到 SmB ₆中的 Eu ²⁺有效地将等离子体频率激发能量从 1.48 eV 降低到 1.25 eV，并导致透射波长向更高波长红移。基于以上有意义的研究，目前的工作有助于扩展纳米晶SmB ₆粉末的光学应用。