Deep-blue light emitting triazatruxene core/oligo-fluorene branch dendrimers for electroluminescence and optical gain applications

We report conjugated dendrimers that can be used to fabricate efficient (<= 1.0 lm W-1 at similar to 100 cd m(-2)) deep-blue emission (1931 CIE (x, y) = (0.15, 0.10)) and high luminance (<= 6000 cd m(-2)) organic light emitting diodes (OLEDs). Slab waveguide structures of these materials show low amplified spontaneous emission (ASE) thresholds (>= 50 nJ for 390 nm, 10 ns, 10 Hz, pulsed excitation). In addition, we report OLEDs based on binary blends of the dendrimers with the green light emitting polymer poly(9,9-dioctylfluorene-co-benzothiadiazole): these have low turn on voltages (>= 2.2 V) and produce high efficiency (18.2 lm W-1 at similar to 100 cd m(-2)) green electroluminescence.