White phosphorescent organic light-emitting devices with dual triple-doped emissive layers

Abstract

We demonstrate high efficiency white organic light-emitting devices with two adjacent emissive layers each doped with three phosphorescent emitters (blue, green, and red). Efficient charge and exciton confinement is realized by employing charge transport layers with high triplet energy, leading to a maximum external quantum efficiency of (19±1)%. Using the p-i-n device structure, we have achieved a peak power efficiency of (40±2) lm/W and (36±2) lm/W at 100 cd/m2, a color rendering index of 79, and Commission Internationale de L’Eclairage coordinates of (0.37, 0.40) for the white light emission.

Recent Advances in White Organic Light‐Emitting Materials and Devices (WOLEDs)

“…The R, G, and B emitters were PQIr (an analog of 14), Ir(ppy) 3 and FIr6 19, respectively. [45] The devices showed low turn on voltages (ca. 3 V), a peak efficiency of 40 …”

Efficient white organic light-emitting diodes with mixed electron transporting layers

“…PHWOLED with a dual tripledoped emitting layer (EML) were reported by S. H. Eom et al [5], and an EML excitons confinement method for highertriplet-energy hole and electron transport was introduced by S. J. Su et al [6].…”

Role of electronic localization in the phosphorescence of iridium sensitizing dyes

“…However, the triplet energy can be measured quite accurately in experiment from the phosphorescence spectra. The largest peak in the phosphorescence spectrum determines the energy of the triplet state, and can be determined with high accuracy [3,[73][74][75][76][77][78][79][80][81][82]. Nevertheless, in contrast to the triplet state, the experimental determination of the singlet energy is very difficult.…”