Synthesis and Characterization of s-Triazine Derivatives as Deep-blue OLEDs Materials

Three 1, 3, 5-triazine derivatives TPTPA, TITPA and TCTPA were synthesized and their electrical, photophysical properties were characterized with respect to their application as emitting layer/electron-transporting layer in Organic Light-Emitting Diodes (OLEDs). Compound TCTPA show higher PL quantum yield (PL) than TPTPA and TITPA. The decrease of LUMO from TPTPA to TCTPA show that TCTPA with extended conjugation exhibits better electron mobility. Among the undoped devices, device with TCTPA as the emissive layer/electron-transporting layer exhibits a maximum brightness of 2 612 cd/m2 at an applied voltage of 20 V, and the maximum luminance efficiency, highest power efficiency were 1.72 cd/A and 1.35 lm/W. Devices doped with Ir(PPy)3, PVK or PBD all show better brightness and efficiency.