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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.
To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.