4CzIPN (CAS number 1416881-52-1), namely 1,2,3,5-Tetrakis(carbazol-9-yl)-4,6-dicyanobenzene, has a fully substituted benzene ring with two cyano groups as electron accepting units at meta-positions to each other and four carbazolyl groups as electron donating units. It is a powerful metal-free organophotocatalyst and also a typical donor–acceptor fluorophore.

Out of its three isomers, 4CzIPN has the highest photo-luminescence quantum efficiency (PLQY) of above 90%. This is due to the wide dispersion the highest-occupied molecular orbital (HOMO) over the donor moieties. Relatively short excited-state lifetime of delayed emission was reported. Additionally, higher external quantum efficiency (EQE) was observed by using 4CzIPN as an emitter in TADF-OLED devices.

Despite its low solubility in most of the aromatic solvents, 4CzIPN is also solution-processable in solvents such as dichloromethane or chloroform. This is due to the structure distortion of the carbazole units caused by steric hindrance.

General Information

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Product Details

Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials.

Chemical Structure

Device Structure(s)

Device structure	ITO (70 nm)/(4 wt% ReO 3 ):mCP (50 nm)/mCP (15 nm)/mCP:B3PyMPM:(5 wt% 4CzIPN) (30 nm)/B3PYMPM (20 nm)/(4 wt% Rb2CO3):B3PYMPM (35 nm)/Al (100 nm) [3]
Colour	Green
Max. Current Efficiency	94.5 cd/A
Max. EQE	29.6%
Max. Power Efficiency	88.6 Im/W

Device structure	ITO (50 nm)/PEDOT:PSS (60 nm)/poly(9-vinylcarbazole) (15 nm)/SiCz:4CzIPN (30 nm)/TSPO1 (35 nm)/LiF (1 nm)/Al (200 nm) [4]
Colour	Green
Max. EQE	26%
Max. Power Efficiency	63.4 Im/W

Device structure	ITO(130 nm)/TAPC (35 nm)/CBP (5 nm)/5 wt% 4CzIPN doped CBP (5 nm)/B4PyPPM (65 nm)/LiF (0.8 nm)/Al (100 nm) [5]
Colour	Green
Max. Current Efficiency	83.2 cd/A
Max. EQE	25.7%
Max. Power Efficiency	106.9 Im/W