Preparation and Luminescence Properties of Europium(III) Ternary Complex-modified Poplar Wood-based Materials

Inspired by the ultraviolet induced properties of biological materials, we developed fluorescent wood as a new type of functional material which can be applied to anti-counterfeit label technology and wood-emitting artwork. This study discusses the influence of temperature, time, ligand ratio, and reactant concentration on the structure and properties of fluorescent wood with europium(III) ternary complexes. The surface morphology and fluorescent properties of the modified wood were characterized by scanning electron microscopy (SEM) and fluorescence spectrometry. The results showed that a high reaction temperature of 75 ºC was beneficial in obtaining stronger fluorescent wood; a reaction time of 8 h exerted a significant influence on fluorescent wood when the reactant concentration of the sample was 0.03 mol/L. In addition, the results of infrared spectroscopy, X-ray photoelectron spectroscopy, and energy-dispersive X-ray analysis showed that modification of wood takes place through the Si-OH groups of the silane coupling agent, which link to the surface of wood. After 120 hours of UV light irradiation, the surface fluorescence intensity of the modified wood can reach 500 arb. units. It can be considered that the modified wood has better anti-ultraviolet aging properties, thereby prolonging the life of poplar.受生物材料紫外诱导特性的启发，本研究研发出荧光木材这一新型功能材料，可应用于防伪标签技术与木质发光艺术品制备领域。本研究探讨了温度、反应时间、配体比例及反应物浓度对铕(III)三元配合物改性荧光木材的结构与性能的影响。通过扫描电子显微镜（scanning electron microscopy, SEM）与荧光光谱法对改性木材的表面形貌与荧光性能进行了表征。结果表明，75℃的较高反应温度有利于制备荧光性能更强的改性木材；当样品反应物浓度为0.03 mol/L时，8小时的反应时间对荧光木材的性能具有显著影响。此外，红外光谱、X射线光电子能谱与能量色散X射线分析的结果显示，木材的改性过程通过硅烷偶联剂的硅羟基（Si-OH）与木材表面结合得以实现。经120小时紫外光辐照后，改性木材的表面荧光强度可达500任意单位（arb. units）。由此可见，该改性木材具备更优异的抗紫外老化性能，可延长杨木的使用寿命。