CAS Number 2171334-43-1
CzDBA is a diboron compound with a D-A-D structure of two electron-donating carbazoles on both ends and an electron-accepting dihydroboranthrene in the middle, bridged by two 2,6-dimethylphenyls between the donor and acceptor units.
With near-trap-free and remarkably balanced bipolar electron and hole transport characteristics, CzDBA is a thermally activated delayed fluorescence (TADF) emitter, converting triplet excitons into singlet excitons via reverse intersystem crossing (RIC). This D-A-D type structure generates TADF with a photoluminescence quantum yield of ~100% and an 84% horizontal dipole ratio in the thin film. A green OLED based on CzDBA exhibits a high external quantum efficiency of 37.8 ± 0.6%, a current efficiency of 139.6 ± 2.8 cd A−1 and a power efficiency of 121.6 ± 3.1 lm W−1 with an efficiency roll-off of only 0.3% at 1,000 cd m−2. Furthermore, the balanced electron and hole transport results in a broad recombination zone, leading to greatly enhanced device stability.
General Information
CAS number
2171334-43-1
Chemical formula
C52H50B2N2
Molecular weight
714.51 g/mol
Absorption*
λmax 342 nm (in toluene)
Fluorescence
λem 524 nm (in film)
HOMO/LUMO
HOMO = 5.93 eV, LUMO = 3.45 eV
Synonyms
5,10-Bis(4-(9H-carbazol-9-yl)-2,6-dimethylphenyl)-5,10-dihydroboranthrene
Classification / Family
Carbazole derivatives, Green dopant, TADF materials, Sublimed materials.
Chemical Structure
CzDBA chemical structure, CAS 2171334-43-1
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