19.1: Invited Paper: Development of Phosphorescent White OLED with Extremely High Power Efficiency and Long Lifetime

Abstract

We developed white OLED device with extremely high power efficiency and long lifetime, in which blue, yellow-green and red phosphorescent emitters were used. The performance achieved was 64lm/W, and 10000 hours of lifetime at initial luminance of 1000cd/m 2 with light out-coupling technique. New technologies, such as blue phosphorescent materials and sophisticated organic layer structure, were applied to the device. The device also exhibited good durability such as storage stability, which is important performance in practical use. We hope that the development discussed in this paper opens up a course to practical use of OLED in lighting sources for illumination use, backlights and others. Expectation to progress of OLED

Recent Progresses on Materials for Electrophosphorescent Organic Light‐Emitting Devices

“…microlenses and refl ecting lamp fi xtures, the luminance effi ciency can be increased to about 1.7 times higher. Nakayama et al [ 221 ] developed a white PhOLED with PE of 64 lm/W and 10 000 h of lifetime at initial luminance of 1000 cd/m 2 with light out-coupling technique by using blue, yellow-green and red phosphorescent emitters.…”

61.5L: Late‐News Paper: Extremely Long Lived White Phosphorescent Organic Light Emitting Device with Minimum Organic Materials

“…luminance of 1,000 nits, and this is an order of magnitude greater than previously reported WOLED lifetimes [8,9]. The LT70 is >90,000 hrs, which is a number more relevant for WOLED illumination applications.…”

Reduced turn-on voltage and improved efficiency with free interfacial energy barrier in organic light-emitting diodes

“…For commercial use, it is important to improve the efficiency and lifetime of both fluorescent and phosphorescent OLEDs [4].…”