UGH-2

ugh-2 chemical structure
Order Code: M2131A1
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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: 99.35% (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.

 

uhg-2 chemical structure, 18856-08-1
Chemical structure of UGH-2; CAS No. 40491-34-7.

 

Applications

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.

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.% (F2CF3CH3ppy)2Ir(pic-N-oxide)* (20 nm)/UGH2:15 wt.% (F2CF3CH3ppy)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.

 

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-oxide
    as 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.

 

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