School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China; Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China.
Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China.
J Colloid Interface Sci. 2023 Sep 15;646:711-720. doi: 10.1016/j.jcis.2023.05.116. Epub 2023 May 22.
Color-tuned luminescence and white-light emission materials have attracted much attention owing to their broad application prospects. Generally, Tb and Eu co-doped phosphors have color-tuned luminescence, but white-light emission is rarely achieved. In this work, color-tunable photoluminescence and white light emission are achieved in Tb and Tb/Eu doped monoclinic-phase LaOCO one-dimensional (1D) nanofibers synthesized by electrospinning united with succedent strictly controlling calcination procedure. The prepared samples own excellent fibrous morphology. LaOCO:Tb nanofibers are the superior green-emitting phosphors. To obtain 1D nanomaterials with color-tunable fluorescence, particularly those with white-light emission, Eu ions are further selected and doped into LaOCO:Tb nanofibers to obtain LaOCO:Tb/Eu 1D nanofibers. The major emission peaks of LaOCO:Tb/Eu nanofibers at 487, 543, 596 and 616 nm are attributed to D→F (Tb), D→F (Tb), D→F (Eu) and D→F (Eu) energy levels transitions under 250-nm (for Tb doping) and 274-nm (for Eu doping) UV light excitation, respectively. At different wavelengths excitation, LaOCO:Tb/Eu nanofibers with excellent stability achieve color-tuned fluorescence and white-light emission with the help of energy transfer from Tb to Eu and tuning the doping concentration of Eu ions. Formative mechanism and fabrication technique of LaOCO:Tb/Eu nanofibers are advanced. The design concept and manufacturing technique developed in this work may offer fresh insights for synthesizing other 1D nanofibers doped with rare earth ions to tune emitting fluorescent colors.
可调色彩发光和白光发射材料由于其广阔的应用前景而受到广泛关注。一般来说，Tb 和 Eu 共掺杂荧光粉具有可调色彩发光，但很少实现白光发射。在这项工作中，通过静电纺丝联合随后严格控制煅烧过程，成功制备出了 Tb 和 Tb/Eu 共掺杂的单斜相 LaOCO 一维（1D）纳米纤维，实现了可调色彩的光致发光和白光发射。所制备的样品具有优异的纤维形态。LaOCO:Tb 纳米纤维是优异的绿色发光荧光粉。为了获得具有可调荧光颜色的一维纳米材料，特别是具有白光发射的纳米材料，进一步选择 Eu 离子并掺杂到 LaOCO:Tb 纳米纤维中，得到 LaOCO:Tb/Eu 一维纳米纤维。LaOCO:Tb/Eu 纳米纤维的主要发射峰位于 487、543、596 和 616nm，分别归因于 250nm（对于 Tb 掺杂）和 274nm（对于 Eu 掺杂）紫外光激发下的 D→F（Tb）、D→F（Tb）、D→F（Eu）和 D→F（Eu）能级跃迁。在不同波长的激发下，LaOCO:Tb/Eu 纳米纤维在 Tb 到 Eu 的能量转移和调节 Eu 离子掺杂浓度的帮助下，实现了可调色彩的荧光和白光发射。LaOCO:Tb/Eu 纳米纤维的形成机制和制备技术得到了发展。本工作中开发的设计理念和制造技术可能为合成其他掺杂稀土离子的一维纳米纤维以调节发射荧光颜色提供新的思路。
