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mCPCN, 9-(3-(9H-Carbazol-9-yl)phenyl)-9H-carbazole-3-carbonitrile, is an asymmetric bipolar and high-triplet-energy (ET = 3.03 eV) phosphorescent host material which could be used for hosting blue, green, red and white light emitting TADF-OLED devices.
The incorporation of the simple and small CN group can greatly improve film morphology and device thermal stabilities. Compared to mCP, CN group attached to the 3-position of the carbazole unit in mCPCN is believed to increases the electron affinity to achieve a rather balanced hole–electron injection and transport properties while not altering electronic transition energies and maintaining a high triplet energy.
Incorporation of a CN group into mCP: a new bipolar host material for highly efficient blue and white electrophosphorescent devices, M-S. Lin et al., J. Mater. Chem., 22, 16114 (2012); DOI: 10.1039/C2JM32717A.
Versatile Thermally Activated Delayed Fluorescence Emitter for Both Highly Efficient Doped and Non-Doped Organic Light Emitting Devices, W-L. Tsai et al., Chem. Commun., 51, 13662-13665 (2015); DOI: 10.1039/C5CC05022G.
Anomalously Long-Lasting Blue PhOLED Featuring Phenyl-Pyrimidine Cyclometalated Iridium Emitter, M. Sarma et al., Chem., 3 (3), 461-476 (2017); DOI: 10.1016/j.chempr.2017.08.001.
Bis-tridentate Ir(III) Complexes with Nearly Unitary RGB Phosphorescence and Organic Light-Emitting Diodes with External Quantum Efficiency Exceeding 31%, C-Y. Kuei et al., Adv. Mater., 28 (14); 2795-2800 (2016); DOI: 10.1002/adma.201505790.
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