铕钇双稀土有机配合物转光剂的制备与性能

Preparation and Properties of Yttrium and Europium Dual Rare Earth Organic Complex Light Conversion Agents

以低成本钇(Y)部分取代高价格铕(Eu),合成与植物吸收光谱更匹配的双稀土有机配合物转光剂。利用多种表征手段对合成的转光剂进行表征。结果表明,转光剂各元素的原子分数与理论值接近,邻菲啰啉和水杨酸配体参与了反应,当转光剂的激发光谱峰位于284、340、394及465nm,发射光谱峰位于593、617及656nm,可将太阳光中的紫外光和紫光转变为植物光合作用所需要的红光。当Y^(3+)的摩尔分数为70%时,转光剂Eu_(0.3)Y_(0.7)(Hsal)_3Phen激发峰强度和发射峰强度都达到最大值,表明Y^(3+)的掺入可以提高Eu^(3+)与配体间的能量转换效率,增强Eu^(3+)的发光能力。热失重分析表明转光剂的分解温度大于234℃。在聚乙烯薄膜中加入0.2 Wt%的铕钇双稀土有机配合物转光剂,转光膜可以由234～340nm的紫外光激发,发射610～640nm红光。

Dual rare earth organic complexes as light conversion agents were prepared by using low cost yttrium partly to replace expensive europium. The as-prepared light conversion agents were characterized by some advanced techniques. The characterization shows the following. Atomic fraction of each element was similar to the theoretical calculation results;phenanthroline ligands and salicylic acid were involved in the reaction;The peaks of excitation spectrum were located at 284 nm, 340 nm, 394 nm, 465 nm, and the peaks of emission spectrum were located at 593 nm, 617 nm, 656 nm. The synthesized light conversion agents could turn the ultraviolet and violet light into red, which is suitable for the photosynthesis of plants. When the molar amount of Y3+ is 70%, the light conversion agent Eu0.3Y0.7(Hsal)3Phen had the strongest excitation peak and emission peak. Results showed that the incorporation of Y3+ could improve the energy conversion efficiency between Eu3+ and ligand, and enhance the luminous ability of Eu3+. Thermal Gravimetric Analysis showed that the decomposition temperature of the synthesized light conversion agents were higher than 234℃. When 0.2% light conversion agents were added into polyethylene films, the light conversion films couble be excited by 234~340 nm UV light and emit 610~640 nm red light.