Wang Xiaojing, Yang Yi, Du Guoping, Chen Nan, Zhang Aisheng
School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):1876-1881. doi: 10.1166/jnn.2018.14214.
Lanthanide ion doped nanoparticles can coordinate with some organic ligands to form the inorganic-organic hybrid nanoparticles, which exhibit greatly enhanced luminescence as a result of the energy transfer from the organic ligands to the lanthanide ions. However, when coordinating with a single type of organic ligand, their luminescence excitation spectral bandwidth is still quite limited. In this work, Eu3+-doped LaF3 (LaF3:Eu3+) nanoparticles, as the model inorganic material, were synthesized using the hydrothermal method. Instead of coordinating with a single type of organic ligand as previously studied, the LaF3:Eu3+ nanoparticles simultaneously coordinate with both benzoic acid and 2-thenoyltrifluoroacetone to form the inorganic-organic mixed hybrid nanoparticles. The mixed hybrid nanoparticles possess a broadband excitation spectrum (200~400 nm) which perfectly covers the entire ultraviolet (UV) spectral range of the solar radiation. By down-converting the UV light to visible light, their broadband UV excitation spectrum will be extremely beneficial to the enhancement of the conversion efficiency of silicon solar cells.
镧系离子掺杂的纳米粒子可以与一些有机配体配位形成无机-有机杂化纳米粒子，由于从有机配体到镧系离子的能量转移，这些纳米粒子表现出大大增强的发光。然而，当与单一类型的有机配体配位时，它们的发光激发光谱带宽仍然相当有限。在这项工作中，采用水热法合成了Eu3+掺杂的LaF3（LaF3:Eu3+）纳米粒子作为模型无机材料。与之前研究的单一类型有机配体配位不同，LaF3:Eu3+纳米粒子同时与苯甲酸和2-噻吩甲酰三氟丙酮配位形成无机-有机混合杂化纳米粒子。该混合杂化纳米粒子具有宽带激发光谱（200~400nm），完美覆盖了太阳辐射的整个紫外（UV）光谱范围。通过将紫外光下转换为可见光，它们的宽带紫外激发光谱将对提高硅太阳能电池的转换效率极为有利。
