A composition including a first compound is disclosed. The first compound is capable of functioning as a phosphorescent emitter in an organic light emitting device at room temperature; wherein the first compound has at least one aromatic ring and at least one substituent R; wherein each of the at least one R is an organic group having at least two atoms of X; wherein each X is independently selected from the group consisting of Si, and Ge; and wherein each of the at least one R is directly bonded to one of the aromatic rings.
揭示了一种包括第一化合物的组合物。第一化合物能够在室温下作为有机发光器件中的
磷光发射体发挥作用;其中第一化合物具有至少一个芳香环和至少一个取代基R;其中至少一个R是具有至少两个X原子的有机基团;其中每个X是独立地从包括Si和Ge的群组中选择的;并且其中至少一个R直接与其中一个芳香环相结合。