Masaki Numata

23.2: New Green and Red Phosphorescent Host Materials for Highly-Efficient and Long-Lifetime OLEDs

We successfully found new phosphorescent host materials. Red host material PRH-01 with a red phosphorescent emitter achieved very high performance of 4.9 V, current efficiency of 20.2 cd/A and half lifetime of 150,000 hrs at an initial luminance of 1,000 cd/m2. We designed new molecular structure of green host material focusing on electron transport property and newly developed material PGH-01 achieved very high performance of 5.3 V, 71.9 cd/A and half lifetime of 150,000 hrs at an initial luminance of 1,000 cd/m2. It was confirmed by simulation that these host materials have great potential to reduce power consumption of full-color OLED displays. We also studied hybrid white OLEDs with combining the latest blue fluorescent material and the phosphorescent materials. High luminous efficacy of about 30 lm/W and long lifetime over 200,000 hrs at an initial luminance of 1,000 cd/m2 without any light outcoupling structure were successfully obtained.