Akihito Saitoh

11.2: Novel Fluorene-Based Blue Emitters for High Performance OLEDs

High performance new blue-emitting host-dopant systems, which consist of pyrene-substituted fluorene hosts such as DPYFL01 and diarylamino-substituted origo(fluorenylene)s represented by BDT3FL as dopants, have been developed. The new host material,DPYFL01 showed high electron-mobility with 1×10−3 cm2/Vs. A device using DPYFL01 demonstrated blue emission (CIE: x, y = 0.15–0.16, 0.20–0.21) with high power efficiency of 4.5 lm/W at 200 cd/m2. The use of 20%BDT3FL inDPYFL01 resulted in deep-blue emission (CIE: 0.15, 0.15) while keeping high power efficiency of 4.6 lm/W at 3.1 V. The device-structure optimization together with the use of an additional host,C-H01 afforded deep-blue emission (CIE: 0.15, 0.14) and higher power efficiency of 4.9 lm/W and external quantum efficiency of 3.9 % at 4.3 mA/cm2 with 200 cd/m2. Lifetime of the optimized device using 10 %BDT3FL was estimated to be over 10,000 hour at an initial luminance of 200 cd/m2.

P‐109: High‐Performable Green‐Emitting OLEDs

High-performance green emitters for OLEDs have been studied. New green emitters, C-GEM1, C-GEM2 and C-GEM3, showed high efficiency and long lifetime when making devices using each material as an emitter. The optimized device demonstrated an external quantum efficiency of over 6% and a power efficiency of 26 lm/W at 1,000 cd/m2 with the lifetime of over 25,000 hours.