UGH-2
1,4-Bis(triphenylsilyl)benzene, known as UGH-2, is one of the well-known TADF host materials for blue-emitting dopants (such as FirPic) in highly-efficient blue PhOLEDs. This is due to its wide energy gap (4.4 eV) and high triplet energy (ET = 3.5 eV).
With a very deep HOMO energy level (HOMO = 7.2 eV), UGH-2 also works as an electron-transport (ETL) and hole-blocking layer (HBL) material.
General Information
| CAS number | 40491-34-7; 18856-08-1 |
| Full name | 1,4-Bis(triphenylsilyl)benzene |
| Chemical formula | C42H34Si2 |
| Molecular weight | 594.89 g/mol |
| Absorption | λmax 265 nm in DCM |
| Fluorescene | λem 298 nm in DCM |
| HOMO/LUMO | HOMO = 7.2 eV, LUMO = 2.8 eV (ET = 3.5 eV) |
| Synonyms | UGH2, 1,4-Phenylenebis(triphenylsilane) |
| Classification / Family | Organic electronics, Hole-blocking layer materials (HBL), TADF blue host materials, Blue PhOLEDs, TADF-OLEDs, Sublimed materials. |
Product Details
| Purity | Sublimed: >99.0% (HPLC) |
| Melting point | TGA: >270 °C (0.5% weight loss) |
| Colour | White powder/crystals |
*Sublimation is a technique used to obtain ultra pure-grade chemicals. For more details about sublimation, please refer to the Sublimed Materials for OLED devices page.
Chemical Structure
Device Structure(s)
| Device structure | ITO/MoOx (5 nm)/NPB (40 nm)/TCTA (5 nm)/3% Y-Pt :mCP(20 nm)/8% FIrpic:UGH2 (20 nm)/TAZ (40 nm)/LiF (0.5 nm)/Al (100 nm) [1] |
| Colour | White 
|
| Max. Current Efficiency | 29.8 cd/A |
| Max. EQE | 10.3% |
| Max. Power Efficiency | 19.7 lm W-1 |
| Device structure | ITO/MoOx (5 nm)/NPB (40 nm)/mCP(10 nm)/2% Y-Pt:8% FIrpic:UGH2 (20 nm)/TAZ (40 nm)/LiF (0.5 nm)/Al (100 nm) [1] |
| Colour | White
|
| Max. Current Efficiency | 28.5 cd/A |
| Max. EQE | 9.1% |
| Max. Power Efficiency | 21.3 lm W-1 |
| Device structure | ITO/MoO x (5 nm)/NPB (40 nm)/4% Y-Pt :TCTA (20 nm)/8%FIrpic:mCP(10 nm)/8% FIrpic:UGH2 (10 nm)/BAlq (40 nm)/LiF (0.5 nm)/Al (100 nm) [1] |
| Colour | White
|
| Max. Current Efficiency | 45.6 cd/A |
| Max. EQE | 16.0% |
| Max. Power Efficiency | 35.8 lm W-1 |
| Device structure | ITO/TAPC (30 nm)/TCTA (10 nm)/CzSi (3 nm)/CzSi doped with 4 wt% of 2c* (25 nm)/UGH2 doped with 4 wt% of 2c*(3 nm)/UGH2 (2 nm)/TmPyPB (50 nm)/LiF (0.8 nm)/Al (150 nm) [2] |
| Colour | Blue 
|
| Max. Current Efficiency | 22.3 cd/A |
| Max. EQE | 11% |
| Max. Power Efficiency | 16.7 Im/W |
| Device structure | (ITO)/a-NPD (30 nm)/TCTA (20 nm)/CzSi (3 nm)/CzSi doped with 6 wt% [Ir(fppz)2(dfbdp)] (35 nm)/UGH2 doped with 6 wt% [Ir(fppz)2(dfbdp)] (3 nm)/UGH2 (2 nm)/BCP (50 nm)/Cs2CO3 (2 nm)/Ag (150 nm) [3] |
| Colour | Blue
|
| Max. Current Efficiency | 11.4 cd/A |
| Max. EQE | 11.9% |
| Max. Power Efficiency | 7.9 Im/W |
| Device structure | ITO/2-TNATA (30 nm)/TAPC (30 nm)/TCTA (10 nm)/mCP:8 wt.% (F2CF3Ch2ppy)2Ir(pic-N-oxide)* (20 nm)/UGH2:15 wt.% (F2CF3Ch2ppy)2Ir(pic-N-oxide) (10 nm)/BAlq (40 nm)/LiF (1 nm)/Al (100 nm) [4] |
| Colour | Blue
|
| Max. Current Efficiency | 36.1 cd/A |
| Max. EQE | 23.3% |
| Max. Power Efficiency | 17.3 Im/W |
| Device structure | ITO/TAPC (40 nm)/mCP (10 nm)/UGH2:10 wt.% FIrpic (20 nm)/ 3TPYMB (40 nm)/LiF (1 nm)/Al (100 nm) [5] |
| Colour | Blue
|
| Max. Current Efficiency | 49 cd/A |
| Max. EQE | 23% |
| Max. Power Efficiency | 31.6 Im/W |
*For chemical structure information, please refer to the cited references.
Pricing
| Grade | Order Code | Quantity | Price |
| Sublimed (>99.0% purity) | M2131A1 | 100 mg | £189.00 |
| Sublimed (>99.0% purity) | M2131A1 | 250 mg | £379.00 |
| Sublimed (>99.0% purity) | M2131A1 | 500 mg | £636.00 |
| Sublimed (>99.0% purity) | M2131A1 | 1 g | £1020.00 |
MSDS Documentation
UGH-2 MSDS sheetLiterature and Reviews
- High Efficiency White Organic Light-Emitting Devices Incorporating Yellow Phosphorescent Platinum(II) Complex and Composite Blue Host, S-L. Lai et al., Adv. Funct. Mater. 2013, 23, 5168–5176 (2013); DOI: 10.1002/adfm.201300281.
- Iridium(III) Complexes of a Dicyclometalated Phosphite Tripod Ligand: Strategy to Achieve Blue Phosphorescence Without Fluorine Substituents and Fabrication of OLEDs, C-H. Lin et al., Angew. Chem., 123, 3240 –3244 (2011); DOI: 10.1002/ange.201005624 .
- En Route to High External Quantum Efficiency (~12%), Organic True-Blue-Light-Emitting Diodes Employing Novel Design of Iridium (III) Phosphors, Y-C. Chiu et al., Adv. Mater., 21, 2221–2225 (2009); DOI: 10.1002/adma.200802546.
- Deep-blue phosphorescent iridium complexes with picolinic acid N-oxideas the ancillary ligand for high efficiency organic light-emitting diodes, H-J. Seo et al., Org. Electron., 11, 564–572 (2010); doi: 10.1016/j.orgel.2009.12.014.
- High efficiency blue phosphorescent organic light-emitting device, N. Chopra et al., Appl. Phys. Lett. 93, 143307 (2008); doi: 10.1063/1.3000382.
To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.