Ru(bpy)_3^(2+)聚电解质光致发光电致发光性质

Characteristic of Photoluminescence and Electroluminescence Based on Tris(bipyridyl)ruthenium(Ⅱ)-doped Polyelectrolytes

以Ru(bpy) 2 + 3 作为发光材料研制聚合物电致发光器件 ,分别以水溶性聚乙烯基氯化铵 (PAA)和聚苯乙烯基磺酸钠 (PSSTS)作为母体材料 ,研究了聚阴阳离子对器件性质的影响。通过对器件结构、母体浓度、掺杂浓度进行优选 ,得到结构为ITO/PVK/Ru∶PAA/LiF/Al的器件。这一器件开启电压为 3 5V ,效率为 1 1lm/W。

Recently organic phosphors have been demanded the attention of the organic electroluminescence community because their efficiencies can be as quadruple as that of the fluorescent materials. The research was focused on the new phosphorescence dyes and host materials. The materials with high-efficient phosphorescence were relatively rare, and to date, only a few of them was found suitable for EL application such as Pt, Ir, Re, and Os complexes. The luminescence of these organometallic complexes is from metal to ligand charge transfer (MLCT) triplet state. As we know, ruthenium(Ⅱ) complex c.a. tris(bipyridyl)ruthenium (Ru(bpy)^(2+)_3) was the most typical MLCT molecule polypyridine, which have been widely studied in the past half-century. The photoluminescence (PL) efficiency of those Ru complex in solution can be in the range of 7% to 50% by substituting with modified (ligands). As a luminescence materials, the electrochemically generated luminescence (ECL) in a liquid cell has been extensively studied, but there are few reports on the use of these materials as emitters in a solid-state devices because Ru(bpy)^(2+)_3 can not be evaporated to form the film, and also can not be doped into semiconductive polymers. Considering that Ru(bpy)^(2+)_3 is a water-soluble molecule, the polyelectrolytes, which generally are water-soluble, may function as host of Ru(bpy)^(2+)_3 to form a molecular-dispersion thin film, subsequently used for LEDs fabrication. Here we reported the properties of EL devices fabricated by doping Ru(bpy)^(2+)_3 into the polyelectrolytes. We have found that the type of opposite charge polymer used as host influences dramatically on the performance of the devices.