DiKTa
CAS Number 32081-22-4
Dopant Materials, Materials, MR-TADF Materials, OLED Materials, Semiconducting Molecules, TADF Materials
MR-TADF Blue Dopant Material
Narrowband MR-TADF emitter for highly efficient OLEDs, Quinolino[3,2,1-de]acridine-5,9-dione, QAO, QAD, Unsublimed ≥98.0%
Specifications | MSDS | Literature and Reviews
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.
General Information
| 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. |
Product Details
| Purity | Unsublimed >98% (HPLC) |
|---|---|
| Melting Point | mp = 257 - 260 °C |
| Appearance | Yellow powder/crystals |
Chemical Structure
Device Structure(s)
| Device structure | ITO/HAT-CN (10 nm)/TAPC (40 nm)/TCTA (10 nm)/3.5 wt% DiKTa:mCP (20 nm)/TmPyPb (50 nm)/LiF (1 nm)/Al (100 nm) [2] |
|---|---|
| Color |
 Blue emission at 468 nm |
| CIE Coordinates | (0.13, 0.18) |
| FWHM | 39 nm |
| Max Luminescence | ≈1,100 cd m-2 |
| Max Current Efficiency | 26.2 cd/A |
| Max Power Efficiency | 31.6 lm/W |
| Max EQE | 19.4% |
*For chemical structure information, please refer to the cited references.
MSDS Documentation
DiKTa MSDS SheetLiterature and Reviews
- Y. Yuan et al. (2019); The Design of Fused Amine/Carbonyl System for Efficient Thermally Activated Delayed Fluorescence: Novel Multiple Resonance Core and Electron Acceptor, Adv. Optical Mater., 7 (7), 1801536; DOI: 10.1002/adom.201801536.
- D. Hall et al. (2020); Improving Processability and Efficiency of Resonant TADF Emitters: A Design Strategy, Adv. Optical Mater., 8 (2), 1901627; DOI: 10.1002/adom.201901627.
- X. Li et al. (2019); Thermally Activated Delayed Fluorescence Carbonyl Derivatives for Organic Light Emitting Diodes with Extremely Narrow Full-Width at Half-Maximum, ACS Appl. Mater. Interfaces, 11 (14), 13472–13480; DOI: 10.1021/acsami.8b19635.