2PTZBN is a multi-resonance thermally activated delayed fluorescence (MR-TADF) green emitter with a DABNA-1 triarylboron core. Two heavy sulfur atoms opposite to the nitrogen atoms are embedded to bridge the the peripheral phenyl rings to form even more rigid structure. By fusing the non-metal sulfur atoms into the multi-resonance B-N framework, it can accelerate the rate of reverse intersystem crossing (RISC) process of the emitter up to 2.8 × 105 s-1 in toluene due to larger spin-orbital coupling (SOC) values and smaller singlet-triplet energy splitting (ΔEST) while compared with the oxygen incorporated green MR-TADF emitter 2PXZBN (PXZ-BN).
OLED device based on 2PTZBN as the active layer dopant and DMIC-TRZ as the host demonstrates maximum EQE of 34.6% with low turn-on voltage below 2.5 V and extremely high luminance over 100,000 cd m-2.
| CAS Number | 2250280-17-0 |
|---|---|
| Chemical Formula | C30H17BN2S2 |
| Molecular Weight | 480.41 g/mol |
| Absorption* | λmax 471 nm (in toluene) |
| Fluorescence | λem 510 nm (in toluene) |
| HOMO/LUMO |
HOMO = - 5.19 eV, HOMO = - 2.73 eV; ΔEST = 0.15 eV [1] |
| Synonyms | PTZ-BN, BN3, [1,4]Benzothiazino[4'',3'',2'':1',8'][1,4]benzazaborino[4',3',2':4,5][1,4]benzazaborino[3,2,1-kl]phenothiazine |
| Classification or Family | Phenothiazine derivatives, Triarylboron, Green dopant, Multiresonance thermally activated delayed fluorescent (MR-TADF), Sublimed materials. |
| Purity | Sublimed* >99% (HPLC) |
|---|---|
| Melting Point | Td = 392 °C |
| Appearance | Orange powder/crystals |
* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials for OLED devices.
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