Ultra high-efficiency multi-photon emission blue phosphorescent OLEDs with external quantum efficiency exceeding 40%

We developed high-efficiency multi-photon emission (MPE) blue phosphorescent OLEDs with external quantum efficiency exceeding 40% at 100 cd m−2. In these MPE devices, we used a blue phosphorescent emitter, FIrpic and pyridine-containing electron-transporters, B3PyPB and B3PyMPM, B4PyMPM. We also used a well-known electron-transporter, BCP for comparison. We used a combination of TAPC/MoO3/Al/Liq layers as the charge-generation layer unit. An optimized MPE device showed an extremely high current efficiency of over 90 cd A−1 and a high power efficiency of over 40 lm W−1 at 100 cd m−2 without any outcoupling enhancement.

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► We made multi-photon emission (MPE) blue phosphorescent OLEDs with external quantum efficiency exceeding 40% at 100 cd/m2.
► In these MPE devices, we used a blue phosphorescent emitter, FIrpic and pyridine-containing electron-transporters.
► We used a combination of TAPC/MoO3/Al/Liq layers as the charge-generation layer (CGL) unit.
► An optimized device shows a current efficiency of over 90 cd/A and a power efficiency of over 40 lm/W at 100 cd/m2.