Construction of Circular Polarized Luminescence Molecules for Intense Near Infrared OLEDs

The exploration of organic near-infrared (NIR) luminescence, along with circularly polarized luminescence (CPL), is of vital importance due to its significance in medical and optoelectronic applications. Integrating a chiral unit into a D-A molecular structure in this research realized emission peaks at 744 nm, exhibiting a dissymmetric factor of -1.67 x 10-3. The introduced chiral TPA derivative not only imparts aggregation-induced emission properties and CPL capabilities but also induces a redshift in the emission spectrum. Consequently, the fabricated NIR organic light-emitting devices (OLEDs), achieve maximum electroluminescent peaks at 748 nm in nondoped devices with the external quantum efficiency of 13.7% in doped devices. This pioneering research provides inspiration for the design of NIR molecules possessing CPL properties in the future, particularly in promoting the application of intense NIR-OLEDs. By incorporating a donor-accepter structure, the study introduced chiral units to create near-infrared emitting molecules (S/R-ONTAP), endowed with circularly polarized luminescence properties. Simultaneously, the introduction of a twisted structure conferred upon these molecules remarkably high photoluminescence quantum yields and exceptional device performance in aggregated states. image