一种新型稀土配合物Eu(TTA)(2NH_2-Phen)_3的发光特性研究

Study on Luminescence Properties of a Novel Rare Earth Complex Eu(TTA)(2NH_2-Phen)_3

合成了一种新型的稀土配合物Eu(TTA)(2NH2-Phen)3,将其作为掺杂物与基质聚乙烯基咔唑(PVK)按照不同质量比混合共溶,旋涂成膜。测量了混合薄膜的光致发光光谱,确认了所合成的Eu(TTA)(2NH2-Phen)3具有发射荧光的能力,进而将其应用于电致发光器件中。还制备了以PVK∶Eu(TTA)(2NH2-Phen)3为发光层,器件结构为ITO/PVK∶Eu(TTA)(2NH2-Phen)3/2,9-di methyl-4,-diphenyl-1,10-phenan throline(BCP)/8-hydroxyquinoline aluminum(Alq3)/Al的多层器件,得到了Eu3+的红色电致发光。研究不同掺杂浓度时器件发光光谱的变化及PVK的发射光谱与Eu(TTA)(2NH2-Phen)3的吸收光谱的交叠情况,证明了混合薄膜中Eu3+电致发光机理主要是载流子的直接俘获。

A novel rare earth complex Eu（TTA）（2NH2-phen）3 was synthesized.The Eu complex was blended with poly（N-vinylcarbazole）（PVK）in different weight ratios and spin coated into films.The photoluminescence of Eu（TTA）（2NH2-phen）3 was obtained.Multilayer devices with PVK∶Eu（TTA）（2NH2-phen）3 as the active layer were fabricated,and the device structure was ITO/PVK∶Eu（TTA）（2NH2-phen）3/2,9-dimethyl-4,-diphenyl-1,10-phenan throline（BCP）/8-hydroxyquinoline aluminum（Alq3）/Al.The influence of Eu（TTA）（2NH2-phen）3 doping concentration on electroluminescence spectroscopy was studied.It was found that the EL spectra do not change with the doping concentration.The spectral overlapping of the emission spectrum of PVK and the absorption spectrum of Eu（TTA）（2NH2-phen）3 is very small.From the above experimental results,it can be demonstrated that the mainly mechanism of Eu（TTA）（2NH2-phen）3 EL is charge carrier directly trapped by ligand.