Fabrication of highly efficient and stable doped red organic light-emitting device using 2-methyl-9,10-di(2-napthyl)anthracene and tris(8-hydroxyquinolinato)aluminum as cohost materials

The authors fabricated red organic light-emitting devices using DCJTB as red dopant, and blue-emitting MADN and green-emitting Alq3 as cohost materials for emission layers. The luminance efficiency of 2% DCJTB-doped Alq3(20%)∕MADN(80%) device was 5.42cd∕A at 20mA∕cm2, while that of equivalently doped Alq3 single-host device was 1.79cd∕A, and remained over 5.2cd∕A up to 200mA∕cm2. At the benchmark luminance of 7680cd∕m2, the power efficiency of DCJTB-doped Alq3∕MADN device was 4.1 times better than that of Alq3 single-host device. Moreover, the half-decay lifetime of DCJTB-doped Alq3∕MADN device measured at an initial luminance of 1000cd∕m2 was 14000h.