两种铽配合物与PVK混合体系的发光机理研究

研究了稀土配合物Tb(p-MBA)₃phen(样品Ⅰ)和Tb(p-ClBA)₃phen(样品Ⅱ)与导电聚合物材料PVK掺杂体系的光致发光和电致发光特性。发现在样品Ⅰ与PVK混合薄膜的光致发光中，除了三价铽离子的发光外，还能看到明显的PVK的发光;而在电致发光中，PVK的发光完全被抑制，只能看到Tb3+的绿光发射。对样品Ⅱ与PVK的混合发光层，无论其光致发光谱还是电致发光谱，都没有看到410 nm处PVK的发射。进一步测量两种材料的激发光谱，初步探讨了器件的发光机理。样品Ⅰ的发光可能来源于两个方面，一是PVK到稀土配合物的不完全的能量传递，二是由于载流子俘获机理;样品Ⅱ的发光则是由于PVK到稀土配合物的完全的能量传递。

The Emission Mechanisms of Two Kinds of Tb Complexes Doped in PVK System

Two kinds of new rare earth complexes Tb(p-MBA)₃phen (sample Ⅰ) and Tb(p-ClBA)₃phen (sample Ⅱ) were synthesized, and photoluminescence (PL) and electroluminescence (EL) characteristics of the terbium complex and PVK blended system were investigated. As to the sample Ⅰ, the emission of PVK was completely restrained in the EL spectra of the blended film; while in the PL spectra, obvious emission of PVK appeared besides the emission of Tb3+. But as to the sample Ⅱ, only the green emission from Tb3+ can be observed in both PL and EL spectra of the doping system. So there are two processes that occur in sample Ⅰ, one is the incomplete Frster energy transfer process from PVK to the Tb complex, and the other is the carrier charge trapping process. The main mechanism of sample Ⅱ is the energy transfer process.