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Product Code M2270A1
Price $288.00 ex. VAT

UGH3, host for highly efficient blue PHOLEDs

High purity (>99.0%) effective HBL material

UGH3, 1,3-bis(triphenylsilyl)benzene, is an isomer to UGH-2, 1,4-bis(triphenylsilyl)benzene.

UGH3 is an ultrahigh energy gap (4.40 eV) organosilicon compounds and a weak electron-transport-type host for highly efficient blue PHOLEDs. UGH3 has a high triplet energy (ET=3.1 eV) and can also be used as a host material to dilute exciplex, to enhance TADF-OLED optical and electrical device performance. Having a deep HOMO energy level (7.2 eV), UGH3 can also be used as an effective hole blocking layer material.

Both UGH2 and UGH3 have low glass transition temperatures (Tg) below 100 °C. BSB, 4,4'-di(triphenylsilyl)-biphenyl, however, offers better morphology of OLED device films for higher device performance and stability with higher Tg at 100 °C.

General Information

CAS number 18920-16-6
Chemical formula C42H34Si2
Molecular weight 594.89 g/mol
Absorption λmax 265 nm in THF
Fluorescence λem 418 nm
HOMO/LUMO HOMO = 7.20 eV, LUMO = 2.80 eV, ET =3.1 eV [1]
Full chemical name 1,3-Bis(triphenylsilyl)benzene
Synonyms UGH-3
Classification / Family Phosphorescent blue host material, Hole blocking materials, Sublimed materials

Product Details

Purity Sublimed >99.0% (HPLC)
Melting point Tg = 46 °C, TGA: >280 °C (0.5% weight loss)
Appearance 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

UGH3, 1,3-Bis(triphenylsilyl)benzene chemical structure
Chemical Structure of 1,3-bis(triphenylsilyl)benzene (UGH3), CAS 18920-16-6

Device Structure(s)

Device structure ITO (70 nm)/NPB (40 nm)/mCP (7.5 nm)/UGH3:FIrpic:Bt2Ir(acac) (14%, 0.3%) (30 nm)/UGH3 (5 nm)/Bphen (50 nm)/LiF (1 nm)/Al (120 nm) [2]
Colour White white light emitting device
Max. Current Efficiency 47.5 cd/A
Max. EQE 18.9 %
Max. Power Efficiency 36.6 Im/W
Device structure ITO (70 nm)/NPB (40 nm)/mCP (7.5 nm)/UGH3:mCP (7:3):14 wt%FIrpic:0.3 wt% Bt2Ir(acac) (30 nm)/UGH3 (5 nm)/Bphen (50 nm)/LiF (1 nm)/Al (120 nm) [2]
Colour White white light emitting device
Max. Current Efficiency 47.6 cd/A
Max. EQE 18.9 %
Max. Power Efficiency 40.9 Im/W
Device structure ITO/NPB (40 nm)/TSBPA (10 nm)|TSBPA:PO-T2T 1:1 in 50 vol % UGH-3 (40 nm)|POT2T (50 nm)|LiF (1 nm)|Al (100 nm) [3]
Colour Green green light emitting device
Max. EQE 19.2 %


Grade Order Code Quantity Price
Sublimed(>99.0% purity) M2270A1 100 mg £230
Sublimed(>99.0% purity) M2270A1 250 mg £460
Sublimed(>99.0% purity) M2270A1 500 mg £720
Sublimed(>99.0% purity) M2270A1 1 g £1200

MSDS Documentation


Literature and Reviews

  1. Arylsilanes and siloxanes as optoelectronic materials for organic light-emitting diodes (OLEDs), D. Sun et al., J. Mater. Chem. C, 3, 9496-9508 (2015); DOI: 10.1039/C5TC01638J.
  2. Improved Performance of White Phosphorescent Organic Light-Emitting Diodes through a Mixed-Host Structure, ETRI. J., 31 (6), 642-646 (2009); J. Lee et al., DOI: 10.4218/etrij.09.1209.0005.
  3. Less Is More: Dilution Enhances Optical and Electrical Performance of a TADF Exciplex, M. Colella et al., J. Phys. Chem. Lett., 10, 793−798 (2019); DOI: 10.1021/acs.jpclett.8b03646.
  4. Ultrahigh Energy Gap Hosts in Deep Blue Organic Electrophosphorescent Devices, X. Ren et al., Chem. Mater., 16, 23, 4743–4747 (2004); DOI: 10.1021/cm049402m.
  5. Identifying the Factors That Lead to PLQY Enhancement in Diluted TADF Exciplexes Based on Carbazole Donors, M. Colella et al., J. Phys. Chem. C, 123 (28); DOI: 10.1021/acs.jpcc.9b03538.
  6. Enhanced efficiency and reduced roll-off in blue and white phosphorescent organic light-emitting diodes with a mixed host structure, J. Lee et al., Appl. Phys. Lett. 94, 193305 (2009); DOI: 10.1063/1.3136861.

To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.

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