Fang Ming, Fu Lianshe, Correia Sandra F H, Ferreira Rute A S, Carlos Luís D
Department of Physics, CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal.
Polymers (Basel). 2018 Apr 13;10(4):434. doi: 10.3390/polym10040434.
In order to prepare efficient luminescent organic⁻inorganic hybrid materials embedded with a lanthanide (Ln) complex with polycarboxylate ligands, Ln-doped di-ureasils with 4,4-oxybis(benzoic acid) and 1,10-phenanthroline ligands were synthesized via an in-situ sol⁻gel route. The resulting hybrids were structurally, thermally, and optically characterized. The energy levels of the ligands and the host-to-ion and ligand-to-ion energy transfer mechanisms were investigated (including DFT/TD⁻DFT calculations). The results show that these Ln-based di-ureasil hybrids exhibit promising luminescent features, e.g., Eu-based materials are bright red emitters displaying quantum yields up to 0.50 ± 0.05. The luminescent color can be fine-tuned either by selection of adequate Ln ions or by variation of the excitation wavelength. Accordingly, white light emission with CIE coordinates of (0.33, 0.35) under 310 nm irradiation was obtained.
为了制备嵌入具有多羧酸盐配体的镧系（Ln）配合物的高效发光有机-无机杂化材料，通过原位溶胶-凝胶法合成了掺杂Ln的含有4,4'-氧双（苯甲酸）和1,10-菲咯啉配体的双脲硅。对所得杂化物进行了结构、热学和光学表征。研究了配体的能级以及主体到离子和配体到离子的能量转移机制（包括密度泛函理论/含时密度泛函理论计算）。结果表明，这些基于Ln的双脲硅杂化物表现出有前景的发光特性，例如，基于Eu的材料是亮红色发射体，量子产率高达0.50±0.05。发光颜色可以通过选择合适的Ln离子或改变激发波长进行微调。因此，在310nm照射下获得了CIE坐标为（0.33,0.35）的白色发光。
