A new family of isophorone-based dopants for red organic electroluminescent devices

A new family of isophorone-based red fluorescent materials (A, B, C, and D) with a typical donor-π-acceptor structure was designed and synthesized for use in organic light-emitting devices (OLEDs). The asymmetrical π-conjugation structure of the isophorone skeleton facilitates the formation of highly pure products in comparison with the synthesis of pyrancontaining DCM analogues. Saturated red-emitting devices with emission peaks at 640680 nm were fabricated using these materials as dopants. The current efficiencies were moderately high and remained unchanged, even at high current density in some devices. The CIE coordinates of all the devices were comparable with or better than those of devices using DCM analogues.