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

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Abstract
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.