Mes3DiKTa is a greenish blue MR-TADF emitter featuring three trimesityl groups attached to a quinolino[3,2,1-de]acridine-5,9-dione core. The steric effect imposed by the three trimesityl groups prevents aggregation-caused quenching even at high doping concentrations. Mes3DiKTa in film while doped in mCP at a concentration of 3.5 wt.% shows an improved photoluminescence quantum yield of 80% compared to 75% for the core structure DiKTa. Despite a relatively large singlet-triplet energy gap (ΔEST ≈ 0.21 eV) ), both Mes3DiKTa and DiKTa, triplets are almost quantitatively upconverted into singlets in electroluminescence. OLED device based on Mes3DiKTa as the emitter shows an EQEmax of 21.1% at 25 cd m-2 with electroluminescence of 480 nm and a narrow FWHM of 36 nm.
Also, MR-TADF emitter Mes3DiKTa can be employed as photocatalyst to give comparable or even superior productivity than the benchmark TADF green emitter and photocatalyst 4CzIPN in a wide range of photocatalytic reactions with long-lived excited states and high absorptivity.
MR-TADF red emitter 3DPA-DiKTa and green emitter 3TPA-DiKTa are also available in sublimed grade.
| CAS Number | N/A |
|---|---|
| Chemical Formula | C47H41NO2 |
| Molecular Weight | 651.83 g/mol |
| Absorption | λmax 451 nm (in toluene) |
| Fluorescence | λem 468 nm (in toluene) |
| HOMO/LUMO |
HOMO = - 5.86 eV, LUMO = - 3.26 eV; ΔEST = 0.21 eV [1] |
| Synonyms | 3,7,11-Trimesitylquinolino[3,2,1-de]acridine-5,9-dione, Mes3-DiKTa |
| Classification or Family | DiKTa derivatives, Green dopant, Multiresonance thermally activated delayed fluorescent (MR-TADF), Sublimed materials. |
| Purity | Sublimed* >99% (HPLC) |
|---|---|
| Melting point | Mp = 249 °C, Td = 437 °C (5% weight loss) |
| Appearance | Bright yellow powder/crystals |
* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials for OLED devices.
Mes3DiKTa chemical structure
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