Have ambipolar carrier transmission property based on novel platinum(II) complexes: Synthesis, photophysical properties, liquid crystalline characteristics, polarized luminescence

A series of new platinum (II) complexes were obtained, where 2-phenylpyridine derivatives are used as the main ligand and 5-substitued tetrazole are used as the auxiliary ligand. Although the complexes with one or without any peripheral flexible around rigid core do not reveal liquid crystallinity, the complexes with three flexible alkoxy chains attached to 2-phenylpyridine and tetrazole display liquid crystalline property. In order to investigate the self-assembly behavior of the liquid crystalline complexes, their polarized luminescence is researched, and the maximum polarization ratio can reach 7.1 at room temperature. Moreover, the ambipolar carrier mobility was measured in these neutral cyclometalated platinum (II) complexes, the electron mobility and hole mobility can reach 3.3 × 10−4 cm2/(V·S) and 6.3 × 10−5 cm2/(V·S), respectively.