Study of the characteristics of new red dopants in OLED

New red dopants TDCJTB and TDIN have been synthesized for using as red fluorescent dye molecules in organic light-emitting diodes (OLEDs). Red-light-emitting devices have been fabricated with a structure of ITO/PVK: dopant/2, 9-dimethyl-4, 7 diphenyl-1, 10-phenanthroline (BCP)/Alq3/LiF/Al. The Commission International d’Eclairage (CIE) coordinates and PL peaks of the devices are [0.61, 0.39], [0.62, 0.38] and 579, 597 nm, respectively. The maximum EL brightness of TDCJTB and TDIN reached 1311 cd/m2 (18 V) and 2497 cd/m2 (16 V), respectively. Compared with traditional DCM ([0.58, 0.41], 1032 cd/m2 (18 V)) the two devices have better CIE coordinates and brightness. When TBQ is doped in these materials, the EL efficiency can both be improved at different level. Present research work shows that when TBQs concentration is 30%, the maximum EL efficiency TDCJTB and TDIN is 2.57 and 2.54 cd/A at 40 mA/cm2, respectively.