合成了具有双配体TTA和5NO2Phen的稀土有机配合物Eu(TTA)35NO2Phen,通过元素分析、差热热重、红外光谱和吸收光谱研究了配合物的组分、结构。元素分析的实验结果与理论计算的结果相吻合。从紫外可见吸收光谱中可以看出,稀土有机配合物的两个吸收峰分别位于340 nm和270 nm,这两个吸收峰分别与配体TTA 和5NO2Phen的吸收峰相关。在350 nm的光激发下,得到了三价铕离子的特征发射峰:583,593和612 nm,它们分别对应着铕离子5D0→7F0,5D0→7F1,5D0→7F2的跃迁发射,这说明有机配体可以将吸收的能量传递给三价铕离子使其发光,配体对稀土铕离子的发光有协同增强的作用。以Eu(TTA)35NO2Phen作为发光层,制备了ITO/PEDOT:PSS/PVK:Eu(TTA)35NO2Phen/BCP/Alq3/Al的电致发光器件,在18 V驱动电压下器件发出了色坐标为(x=0.51,y=0.31)的红色电致发光。

The Eu3+ rare-earth organic complex with double ligands of TTA and 5NO2Phen is synthesized. The characteristics of this compound are studied by elemental analysis,TG-DTA,infrared spectra,UV-visible absorption spectra. From the UV-visible absorption spectra,it can be seen that there are two absorption peaks locating at 340 nm and 270 nm,which correspond to the absorption peaks of TTA and 5NO2Phen,respectively. Under the excitation of 350 nm light,three characteristic emission peaks of Eu3+ ions are obtained:5D0→7F0 (583 nm),5D0→7F1(593 nm) and 5D0→7F2(612 nm) . Experimental results demonstrate that the ligands can transfer the absorbed energy to Eu3+ ion. The ligands can effectively enhance the luminescent performance of Eu3+ ion. Electroluminescence devices ITO/PEDOT:PSS/PVK:Eu(TTA)35NO2Phen /BCP/Alq3/Al based on Eu complex as the active layer are fabricated,and the red emission color coordinate is about (x=0.51,y=0.31) under 18 V driving voltage.