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4,4'-Bis(9-carbazolyl)-2,2'-dimethylbiphenyl (CDBP) has a large bandgap (E = 3.4 eV) and a high triplet energy level (T1 = 3.0 eV). It is used as a fluorescent and phosphorescent host material in blue, green, red and white OLED and TADF devices.
The high triplet energy level of CDBP is caused by the steric twisting from the methyl groups (in the 2 and 2′ position) of the biphenyl core. Compared to CBP and mCBP, CDBP has higher tendency to form excimers due to the localisation of the of the excitation onto the both ends of the carbazole units.
CDBP can also function as an exciton-blocking layer - it can block excitons migrating from the emitting layer into the hole-transport layer.
Blue organic light-emitting diodes realizing external quantum efficiency over 25% using thermally activated delayed fluorescence emitters, T. Miwa et al., Sci. Rep., 7, 284 (2017); DOI:10.1038/s41598-017-00368-5.
White Organic Light-Emitting Diodes with Evenly Separated Red, Green, and Blue Colors for Efficiency/Color-Rendition Trade-Off Optimization, S. Chen et al., Adv. Funct. Mater., 21, 3785–3793 (2011); DOI: 10.1002/adfm.201100895.
Platinum(II) cyclometallates featuring broad emission bands and their applications in colortunable OLEDs and high color-rendering WOLEDs, G. Tan et al., J. Mater. Chem. C, 4, 6016 (2016); DOI: 10.1039/c6tc01594h.
Highly efficient blue phosphorescent and electroluminescent Ir(III) compounds, Y. Kang et al., J. Mater. Chem. C, 1, 441 (2013); DOI: 10.1039/c2tc00270a.
Efficient, color-stable and high color-rendering-index white organic light-emitting diodes employing full thermally activated delayed fluorescence system, M. Zhang et al., Org. Electronics 50, 466e472 (2017); doi: 10.1016/j.orgel.2017.08.024.
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