4DBFHPB
CAS Number 2280942-02-9
High Purity Sublimed Materials, Hole Transport Layer Materials, Materials, OLED Materials, Semiconducting Molecules, TADF Materials
Hexaphenylbenzene-based Hole Transport Layer
High purity HTL material, sublimed ≥99%
Specifications | MSDS | Literature and Reviews
4DBFHPB is a hole transport layer material based on a hexaphenylbenzene (HPB) core with two electron-donating dibenzofuranylphenylamine peripheral groups. Dibenzofuran-terminated hole-transporters are well-known for highly efficient and long lifetime thermally activated delayed fluorescent (TADF) and phosphorescent organic light-emitting devices (OLEDs).
4DBFHPB exhibits high glass temperature (Tg) of 135 °C with superior thermal and electrical stability, and substantially improved anionic bond dissociation energy (BDE) when compared with its phenyl-containing counterpart, realizing high device stability in blue and green emitting OLEDs. Green TADF-OLED based on 4DBFHPB as HTL and 4CzIPN as the green emitter exhibited approximately 19.2% EQE and LLT50 of over 24,000 h, and a low driving voltage of 4.07 eV at 1000 cd cm-2.
The material also demonstrates high triplet energy level ET of 2.7 eV, and hole transport rate of 1.5 × 10−3 cm2 V−1 s−1, 300 times greater than that of its phenyl counterpart TATT which contains two diphenylamine end groups.
- High triplet energy level
- High hole mobility
- Great blue and green TADF device stability with long LT50
General Information
| CAS Number | 2280942-02-9 |
|---|---|
| Chemical Formula | C78H52N2O2 |
| Molecular Weight | 1049.26 g/mol |
| Absorption | λmax 325 nm (in Film) |
| Photoluminescence | λem 399 nm (in Film) |
| HOMO/LUMO | HOMO = - 5.80 eV, LUMO = - 2.60 eV (ET = 2.7 eV) |
| Synonyms | N4,N4''-Bis(4-dibenzofuranyl)-N4,N4'',2',3',5',6'-hexaphenyl-[1,1':4',1''-terphenyl]-4,4''-diamine |
| Classification or Family | Triarylamine derivative, Sublimed materials, Hole transport layer (HTL), OLEDs |
Product Details
| Purity | Sublimed ≥99%, unsublimed ≥98% |
|---|---|
| Melting Point | Tg = 135 °C, Tm = 313 °C, Td = 490 °C (5% weight loss) |
| Appearance | Pale brown to beige powder/crystals |
Chemical Structure
Device Structure(s)
| Device Structure | TO (100 nm)/PTAA:PPBI (20 nm)/NPD (10 nm)/4DBFHPB (10 nm)/mCBP:20 wt.% 4CzIPN (30 nm)/DBT-TRZ(10 nm)/DPB: 20 wt.% Liq (40 nm)/Libpp (1 nm)/Al [1] |
|---|---|
| Color |
 Green light emission |
| VON | 2.45 V |
| Max EQE | 21.2% |
| Max. Current Efficiency | 72.7 cd/A |
| Max. Power Efficiency | 71.3 lm/W |
| LT50 | 24,000 h |
| Device Structure | TO (100 nm)/PTAA:PPBI (20 nm)/NPD (10 nm)/4DBFHPB (10 nm)/mCBP:20 wt.% 5TCzBN (30 nm)/DBT-TRZ(10 nm)/DPB: 20 wt.% Liq (40 nm)/Libpp (1 nm)/Al [1] |
|---|---|
| Color |
 Sky-blue light emission |
| VON | 2.74 V |
| Max EQE | 21.5% |
| Max. Current Efficiency | 56.1 cd/A |
| Max. Power Efficiency | 60.5 lm/W |
| LT50 | 17,00 h |
MSDS Documentation
4DBFHPB MSDS SheetLiterature and Reviews
- T. Kamata et al. (2020); Simultaneous realization of high-efficiency, low-drive voltage, and long lifetime TADF OLEDs by multifunctional hole-transporters, J. Mater. Chem. C, 8, 7200-7210; DOI: 10.1039/D0TC00330A.
- H. Sasabe et al. (2022); Four dibenzofuran-terminated high triplet energy hole-transporters for high-efficiency and long-life organic light-emitting devices, Chem. Eur. J., 28 (13), e202104408; DOI: 10.1002/chem.202104408.