Highly-efficient solution-processed OLEDs based on new bipolar emitters

A series of new bipolar solution-processable RGB materials are designed by considering the solubility, morphology, fluorescence efficiency and carriers balance. Solution-processable OLEDs are fabricated with high efficiencies, especially, the green TCBzC-based device shows the maximum luminous efficiency of 31.6 cd A−1, which is among the best reported values.