A novel phenothiazine derivative for application in high performance red emitting electroluminescent device

The new red emitting materials based on phenothiazine and DCM were synthesized by Knoevenagel condensation following Vilsmeyer-Haack formulation. The obtained materials showed good thermal stability and amorphous property. The ITO/CuPc/NPB/Alq(3) :KSR-1 (0.2%)/Alq(3)/LiF/Al device showed 3.5 cd/A of efficiency and CIE color coordinate of (0.46, 0.47) at 10 mA/cm(2) and 29000 cd/m(2) of maximum brightness at 11V and 512 mA/cm(2) . In the device using the Alq(3) :KSR-1 (0.5%) as emitting material device, 1.5 cd/A of efficiency and CIE color coordinate of (0.55, 0.42) at 10 mA/cm(2) and 19200 cd/m(2) of maximum brightness at 12 V and 702 mA/cm(2) were observed.