Bipolar Arylsilane: Synthesis, Photoelectronic Properties,\nand High-Performance Deep Blue Organic Light-Emitting Diodes

Although\ngreat advances have been achieved in organic electroluminescence\nfields, highly efficient deep blue materials are still limited. In\nthis work, two sp³ linker connected bipolar arylsilanes,\nend-capped by diphenylamino/carbazolyl and phenanthroimidazole, were\nprepared and characterized. The bipolar arylsilanes exhibit high thermal/morphological\nstabilities, deep blue emission, and high luminescence efficiencies\nin a solid state. Information obtained for the crystal structures\nindicates a twisted conformation for the molecules. Organic light-emitting\ndiodes (OLEDs) using <b>DSiPPI</b> as a dopant exhibit a deep\nblue luminescence with Commission Internationale de L’Eclairage\n(CIE) coordinates of (0.167, 0.078) and a maximum external quantum\nefficiency (EQE_max) of 7.07%, indicating the great potential\nfor the use of this chromophore in deep blue OLED applications.