Solution processed deep blue phosphorescent organic light-emitting diodes with over 20% external quantum efficiency

Highly efficient solution processed deep blue phosphorescent organic light-emitting diodes (PHOLEDs) were developed using a solution processible high triplet energy host and deep blue dopant materials. Stable film morphology was observed from the spin coated deep blue emitting layer and a high quantum efficiency of 22.1% was achieved in the deep blue PHOLED with a color coordinate of (0.14, 0.19).

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► High efficiency solution processed deep blue organic light emitting diodes.
► Above 20% external quantum efficiency in solution deep blue device.
► Deep blue color coordinate of (0.14, 0.19) in solution device.