Abstract
Efficient deep-blue organic light emitting diodes (OLEDs) have always been of great interest for both academia, and industry. Here, we reported facilely available phenanthroimidazole-triazole derivatives PITZF and PITZtCz with hybridized local and charge transfer states (HLCT) characteristics and investigated the effect of assistant terminal groups on the excited states and electroluminescence properties. Both fluorophores showed a remarkable thermal stability with a thermal decomposition temperature of over 400 °C. Compared with PITZF, the introduction of 3,6-di-tert-butylcarbazole (tCz) assistant donor in PITZtCz boosted a fine modulation of excited state with an elevated locally excited (LE) compound and more efficient charge transfer (CT) transition in the high lying excited state, which contributes to a more efficient exciton utilization efficiency (EUE). The resulting doped OLEDs provided highlighted maximum EQE of 7.21% and low efficiency roll-off without sacrificing the color purity. The deep-blue emission was found with CIE coordinate of (0.158, 0.050), which is very close to the blue standard of Rec.2020.
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