High-luminance and high-efficiency organic electroluminescent devices with a doped co-host emitter system

TDCJTB, BMDIN and TDIN have been synthesized for using as red fluorescent dye molecules in organic light-emitting diodes (OLEDs). The Commission International d'Eclairage (CIE) coordinates and PL peaks of the devices are [0.61, 0.39], [0.65, 0.35], [0.62, 0.38] and 579 nm, 619 nm, 597 nm, respectively. Compared with traditional DCM ([0.58, 0.41], 575 nm) the three devices have better brightness and CIE coordinates. When TBQ is doped in the three materials the EL efficiency can all be improved at different levels. BMDIN as a high efficient red organic light-emitting material based on this series of fluorescent dyes doped in co-host emitter (CHE) systems of TBQ/poly(N-vinylcarbazole) (PVK) can achieve a higher luminescent efficiency and brightness than the other materials. Present research work shows that when TBQ's concentration is 30%, the maximum EL efficiency is 6.1 cd/A at 40 mA/cm2.