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 (E_T = 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 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.

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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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