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5CzBN, penta-carbazolylbenzonitrile, is sterically hindered due to the five bulky electron-donating carbazolyl groups on the benzene ring struggling for space. It is a light-blue TADF fluorescence emitter widely used for highly efficient TADF-OLED devices.
λmax 325 nm, 348 nm and 420 nm in DCM
λem 488 nm in toluene
HOMO = 5.55 eV, LUMO = 2.74 eV, T1 = 2.68 eV 
Classification / Family
Carbazole, Phthalonitrile, TADF materials, Blue dopant materials, Sublimed materials
Recent progress of green thermally activated delayed fluorescent emitters, Y. Im et al., J. Info. Display, 18 (3), 101-117 (2017); DOI: 10.1080/15980316.2017.1333046.
Sterically shielded blue thermally activated delayed fluorescence emitters with improved efficiency and stability, D. Zhang et al., Mater. Horiz., 3, 145-151 (2016); doi: 10.1039/C5MH00258C.
Excited state engineering for efficient reverse intersystem crossing, H. Noda et al., Sci. Adv., 4:eaao6910 (2018); DOI: 10.1126/sciadv.aao6910.
Evidence and mechanism of efficient thermally activated delayed fluorescence promoted by delocalized excited states, T. Hosokai et al., Sci. Adv., 3:e160328 (2017); DOI: 10.1126/sciadv.1603282.
Modulation of Förster and Dexter Interactions in Single-Emissive-Layer All-Fluorescent WOLEDs for Improved Efficiency and Extended Lifetime, P. Wei et al., Adv. Funct. Mater., 2019; DOI: 10.1002/adfm.201907083.
Highly efficient and stable blue thermally activated delayed fluorescence emitters, D. Zhang et al., SPIE (2016); DIO: 10.1117/2.1201611.006797.
Critical role of intermediate electronic states for spin-flip processes in charge-transfer-type organic molecules with multiple donors and acceptors, H. Noda et al., Nat. Mater., 18(10), 1-7 (2019); DOI: 10.1038/s41563-019-0465-6.
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