Abstract
Two carbazole or carbazole-3-carbonitrile/pyridine-based bipolar materials were designed and synthesized as the hosts for solution-processed sky-blue PhOLEDs and green TADF-OLEDs. The solution-processed blue PhOLEDs based on 2,6-CzPy and CN-2,6-CzPy were fabricated exhibiting CEmax of 27.4, 14.0 cd A−1 and PEmax of 11.1, 5.6 lm W−1. Remarkably, the turn-on voltage (Von) of device A and B based on 2,6-CzPy drops slightly, as the doping concentration increasing from 10% to 15%. The green TADF-OLED based on 2,6-CzPy shows CEmax of 10.6 cd A−1, EQE of 3.0%. Although the rational introduction of cyano substituents can significantly upgrade the thermal stability of the hosts. Tg and Td of CN-2,6-CzPy improved by 53 °C and 83 °C than 2,6-CzPy. Nevertheless, the introduction of cyano substituents leads to CN-2,6-CzPy exhibiting deeper HOMO and generating a large hole injection barrier is not conducive to improve device performance.
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