MR-TADF Red Dopant with a DiKTa Core
High purity sublimed narrowband MR-TADF emitter for highly efficient OLEDs, 3,7,11-Tris(diphenylamino)quinolino[3,2,1-de]acridine-5,9-dione, Sublimed ≥99.0%
3DPA-DiKTa is a MR-TADF pure red emitter with three electron-donating diphenylamine (DPA) units symmetrically attached to an electron-accepting acridine-5,9-dione (DiKTa) core at the positions opposite to the central nitrogen atom, characterized by relatively small ΔEST of 0.20 eV, narrow FWHM of 56 nm, and high photoluminescence quantum efficiency of 60% in 2 wt.% mCP doped films with emission at 617 nm.
Due to the preferential horizontal orientation of the transition dipole moments of the emitter, OLED-TADF device based on 3DPA-DiKTa as the active layer material exhibits bright, narrowband red emission in doped films, showing great performance with maximum external quantum efficiencies (EQEmax) of 16.7% at λEL=613 nm. When 4CzIPN is used as an assistant dopant, hyperfluorescence (HF) device based on 3DPA-DiKTa shows significantly improved efficiency roll-off and higher brightness.
The MR-TADF green emitter 3TPA-DiKTa and blue emitter Mes3DiKTa are also available in sublimed grade.
General Information
| CAS Number | n.a. |
|---|---|
| Chemical formula | C56H38N4O2 |
| Molecular weight | 798.93 g/mol |
| Absorption* | λmax 554 nm (in toluene) |
| Fluorescence | λem 617 nm (in film) |
| HOMO/LUMO | HOMO = - 5.13 eV, LUMO = - 3.01 eV; ΔEST = 0.20 eV [1] |
| Synonyms | 3,7,11-Tris(diphenylamino)quinolino[3,2,1-de]acridine-5,9-dione |
| Classification or Family | DiKTa derivatives, Diphenylamines, Red dopant, Multiresonance thermally activated delayed fluorescent (MR-TADF), Sublimed materials. |
Product Details
| Purity | Sublimed* >99% (HPLC) |
|---|---|
| Melting point | Mp = 287-289 °C [1] |
| Appearance | Deep red powder/crystals |
* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials for OLED devices.
Chemical Structure
Device Structure(s)
| Device structure | ITO (112 nm)/HATCN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/mCP (10 nm)/2.0 wt.% 3DPA-DiKTa:mCP (20 nm)/TmPyPB (50 nm)/LiF (0.6 nm)/Al (100 nm) [1] |
|---|---|
| Color |
 Red light emission at 613 nm |
| FWHM | 60 nm |
| Max Luminance | 8,800 cd m-2 |
| CIE coordinates | (0.633, 0.365) |
| Max Current Efficiency | 28 cd/A |
| Max Power Efficiency | 27 lm/W |
| Max EQE | 16.7% |
| Device structure | ITO/HATCN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/mCP (10 nm)/10 wt % 4CzIPN and 2 wt. % 3DPA-DiKTa in mCP (20 nm)/TmPyPB (50 nm)/LiF (0.6 nm)/Al (100 nm) [1] |
|---|---|
| Color |
Red light emission at 615 nm |
| FWHM | 61 nm |
| Max Luminance | 46,003 cd m-2 |
| CIE coordinates | (0.585, 0.396) |
| Max Current Efficiency | 35 cd/A |
| Max Power Efficiency | 37 lm/W |
| Max EQE | 17.9% |
MSDS Documentation
3DPA-DiKTa MSDS SheetLiterature and Reviews
- S. Wu et al. (2022); Highly Efficient Green and Red Narrowband Emissive Organic Light-Emitting Diodes Employing Multi-Resonant Thermally Activated Delayed Fluorescence Emitters, Angew. Chem. Int. Ed., 61 (52), e202213697; DOI: 10.1002/ange.202213697.
- Z. Zhang et al. (2025); Design strategy for thermally activated delayed fluorescence materials with multiple resonance effect, Acta Phys-Chim Sin., 41 (1), 100006; DOI: 10.3866/PKU.WHXB202309042.