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UGH-2

ugh-2 chemical structure
Order Code: M2131A1
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MSDS sheet
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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

UGH-2 chemical structure
Chemical structure of UGH-2

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 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 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 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 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 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 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 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 MSDSUGH-2 MSDS sheet

Literature and Reviews

  1. 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.
  2. 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 .
  3. 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.
  4. 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.
  5. 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.

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