CAS Number 1799923-03-7
3CzBN is a benzonitrile derivate with three electron-doating carbazole units at meta-positions to each other. The D-A type structure is designed to maximize electronic delocalization across the molecule. 3CzBN has a ΔEST value of 0.21 eV and shows no TADF emission in toluene solution at room temperature however solvent freezing leads to the appearance of both the phosphorescence and thermally-activated emission bands. Also, because of the huge drop of ΔEST(LE) value, the energy gap between the singlet charge-transfer (1CT) and triplet locally excited (3LE) states from 0.20 eV in toluene to 0.09 eV in acetonitrile, 3CzBN becomes TADF active in acetonitrile.
Being a high-triplet-energy host with favourable carrier injection/transporting abilities, 3CZBN enables blue TADF device based on 4TCzBN dopant with a maximum external quantum efficiency of 14.8%, a maximum power efficiency of 29.5 lm W−1 and an ultra-low onset voltage of 2.8 V.
General Information
CAS number
1799923-03-7
Chemical formula
C43H26N4
Molecular weight
598.69 g/mol
Absorption*
λmax n.a.
Fluorescence
λem 432 nm (Toluene)
HOMO/LUMO
HOMO = 5.75 eV, LUMO = 2.61 eV (ΔEST = 0.21 eV)
Synonyms
2,4,6-Tri(9H-carbazol-9-yl)benzonitrile
Classification / Family
Cyanoarenes, Carbazole derivatives, TADF blue host.
Product Details
Purity
Unsublimed >98% (HNMR), Sublimed ≥99% (HPLC)
Melting point
Tg = 153 °C, Td = 401 °C
Appearance
Off-white powder
Chemical Structure
Chemical structure of 3CzBN, CAS No: 1799923-03-7
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