Blue Dopant Materials, Dopant Materials, High Purity Sublimed Materials, Materials, MR-TADF Material
CzBN is closely related to DABNA-1 in structure. The only difference being is that the two phenylamines on each side of the DABNA-1 structure are joined to form two side carbazolyl substructures. As a result, CzBN is conjugated with a triphenyl boron core and it is believed that the formed carbazolyl groups extend the π-conjugation and increase the intramolecular charge transfer localization area for a greater multiresonance effect.
CzBN can also be considered as a derivate of 1,3-bis(N-carbazolyl)benzene (mCP), one of the most widely used host materials in OLED devices.
DABNA-1 and CzBN chemical structures
Due to the conjugation, CzBN is relatively red shifted in absorption and emission when compared to DABNA-1. CzBN has an absorption band at around 470 nm and narrow emission band at 479 nm with FWHM of 30 nm in dilute dichloromethane solution and PLQYs of 87%.
A solution processed sky-blue multiresonance TADF OLED device, based on 5 wt.% CzBN in a CzAcSF host, exhibited a maximum current efficiency of 24.3 cd/A, a power efficiency of 15.9 lm/W, and an external quantum efficiency of 14.7%. This is a device efficiency improvement when compared to the vacuum-deposited OLEDs based on DABNA-1.
| CAS Number | 2170487-27-9 |
|---|---|
| Chemical formula | C30H17BN2 |
| Molecular weight | 416.28 g/mol |
| Absorption* | λmax 470 nm (in DCM) |
| Fluorescence | λem 479 nm (in DCM) |
| HOMO/LUMO |
HOMO = 5.62 eV, LUMO = 2.91 eV (ΔEST = 0.12 eV) |
| Synonyms | Indolo[3,2,1-de]indolo[3',2',1':8,1][1,4]benzazaborino[2,3,4-kl]phenazaborine |
| Classification or Family | Triarylamine derivatives, Tryphenylboron, Blue dopant, Multiresonance thermally activated delayed fluorescent (MR-TADF), Sublimed materials. |
| Purity | Sublimed* >99% (HPLC) |
|---|---|
| Melting point | - |
| Appearance |
Yellow powder/crystals |
* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials for OLED devices.
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