Organic light emitting devices are described wherein the emissive layer comprises a host material containing an emissive molecule, which molecule is adapted to luminesce when a voltage is applied across the heterostructure, and the emissive molecule is selected from the group of phosphorescent organometallic complexes, including cyclometallated platinum, iridium and osmium complexes. The organic light emitting devices optionally contain an exciton blocking layer. Furthermore, improved electroluminescent efficiency in organic light emitting devices is obtained with an emitter layer comprising organometallic complexes of transition metals of formula L2MX, wherein L and X are distinct bidentate ligands. Compounds of this formula can be synthesized more facilely than in previous approaches and synthetic options allow insertion of fluorescent molecules into a phosphorescent complex, ligands to fine tune the color of emission, and ligands to trap carriers.
描述了有机发光器件,其中发射层包括含有发射分子的主材料,当在异质结构上施加电压时,发射分子发光,发射分子选自
磷光有机
金属络合物组,包括环
金属化
铂、
铱和
锇络合物。有机发光器件可选择包含激子阻挡层。此外,使用包含式
L2MX 的过渡
金属有机
金属络合物的发射层可提高有机发光器件的电致发光效率,其中 L 和 X 是不同的双齿配位体。与以前的方法相比,这种式子的化合物更容易合成,而且合成方法允许在
磷光配合物中插入荧光分子、
配体来微调发射颜色,以及
配体来捕获载流子。