Red, phosphorescent OLEDs: New, bipolar materials, photophysical characterization, charge transport and OLED optimization

由宽禁带半导体齐聚物和聚合物与磷光、红色发光金属配体络合物组成的发光二极管在显示技术和大面积彩色照明应用中具有良好的前景。这些优点是通过将低成本、湿化学可加工性与高效和纯净的红色发射颜色相结合而产生的，这对于例如用于电视和个人计算机屏幕或作为红色照明面板的全彩大面积平板显示器的开发是重要的。这一联合项目致力于开发宽禁带半导体齐聚物和聚合物的智能组合，这些聚合物与磷光红光Ir(111)和Os(11)金属配体络合物混合。这些配合物的配体设计是这样的：电子和空穴传输部分连接到螯合单元，从而与这些将直接连接到金属核心的高度共轭的配体系统相互作用。这种设计允许在磷光物种上进行有效的电荷复合，预计将导致三重态系统更高效、颜色纯净的红光发射。将对这些材料组合物中的能量传递、电荷产生和传输进行研究和优化，这将对改进和高效饱和红色发光二极管的设计产生有益的影响。

Light-emitting diodes consisting of wide bandgap semiconducting oligomers and polymers combined with phosphorescent, red light-emitting metal-ligand complexes offer favorable perspectives in display technology as well as in large area colored lighting applications. The advantages result through a combination of low cost, wet-chemical processability with a highly efficient and pure, red emission color, which is of importance to the development of e.g. full color large area flat panel displays for television - and personal computer screens or as red colored lighting panels. This joint project addresses the development of smart combinations of wide bandgap semiconducting oligomers and polymers that are blended with phosphorescent red light-emitting iridium(lll) and osmium(ll) metal-ligand complexes. The ligand design of these complexes is such that electron and hole transporting moieties are connected to the chelating units and thus are interacting with these highly conjugated ligand systems that will be directly attached to the metal core. This design is allowing efficient charge recombination at the phosphorescent species expected to result in more efficient, color pure, red light emission of the triplet systems. Investigation and optimization of energy transfer, charge generation and transport in these material compositions will be carried out, being of beneficial impact towards the design of improved and highly efficient, saturated red light-emitting diodes.