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 Alq(3) as cohost materials for emission layers. The luminance efficiency of 2% DCJTB-doped Alq(3)(20%)/MADN(80%) device was 5.42 cd/A at 20 mA/cm(2), while that of equivalently doped Alq(3) single-host device was 1.79 cd/A, and remained over 5.2 cd/A up to 200 mA/cm(2). At the benchmark luminance of 7680 cd/m(2), the power efficiency of DCJTB-doped Alq(3)/MADN device was 4.1 times better than that of Alq(3) single-host device. Moreover, the half-decay lifetime of DCJTB-doped Alq(3)/MADN device measured at an initial luminance of 1000 cd/m(2) was 14 000 h. (c) 2006 American Institute of Physics.