CAS Number 32081-22-4
DiKTa is known to be the smallest TADF emitter with two carbonyl groups bridging the phenyl rings of a triphenylamine core. The carbonyl bridged triphenyamine is known as quinolino[3,2,1-de]acridine-5,9-dione (QAO). DiKTa is a multiple resonances thermally activated delayed fluorescence (MR-TADF) blue emitter, realized by the opposite resonance effect of the carbonyl and the nitrogen atoms that are close to each other.
DiKTa has high photoluminescence quantum efficiency of 72% and narrow blue emission (λPL = 468 nm). The QAO-based pure blue organic light-emitting diode achieves a maximum external quantum efficiency (EQEmax) of 19.4% with a small full width at half maximum of 39 nm.
DiKTa and its derivative Mes3DiKTa give comparable or even better product yield than 4CzIPN in a range of photocatalytic processes involving energy transfer, reductive and oxidative quenching, and dual photocatalytic processes.
MR-TADF red emitter 3DPA-DiKTa and green emitter 3TPA-DiKTa are also available in sublimed grade.
| CAS Number |
32081-22-4 |
|---|---|
| Chemical Formula | C20H11NO2 |
| Molecular Weight | 297.31 g/mol |
| Absorption* | λmax n.a. |
| Fluorescence | λem 453 nm (in toluene) |
| HOMO/LUMO |
HOMO = - 5.94 eV, LUMO = - 2.31 eV; ΔEST = 0.2 eV [1] |
| Synonyms | Quinolino[3,2,1-de]acridine-5,9-dione, QAO, QAD |
| Classification or Family | Quinolino[3,2,1-de]acridine-5,9-dione, Blue dopant, Multiresonance thermally activated delayed fluorescent (MR-TADF), Sublimed materials. |
| Purity | Unsublimed >98% (HPLC) |
|---|---|
| Melting Point | mp = 257 - 260 °C |
| Appearance |
Yellow powder/crystals |
Chemical structure of DiKTa, CAS 32081-22-4
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