2,3,5,6-tetrakis(3,6-di-tert-butylcarbazol-9-yl)-1,4-dicyanobenzene (4CzTPN-tBu) is the t-butylated derivative of 4CzTPN and it is sterically hindered with eight bulky tert-butyl peripheral end groups. Also due to the tert-butyl peripheral end groups, it becomes more soluble in most of the common organic solvents which makes all solution processing device possible.
4CzTPN-tBu as orange emitting layer, when blended in sky-blue delayed fluorescence molecule (4-(spiro[acridine-9,9’-fluoren]−10-yl)phenyl)(9-(3,5-di(carbazol-9-yl)phenyl)carbazol-3-yl)methanone (TCP-BP-SFAC) host, achieved record high power efficiency (PE) of 130.7 lm W-1, due to the balanced ambipolar transportation and high solid-state efficiency of TCP-BP-SFAC, and the effectively alleviated exciton quenching caused by the electron-trapping effect of 4CzTPN-tBu [1].
4CzTPN-tBu is an isomer to 4CzPN-tBu and 4CzIPN-tBu.