UGH3

CAS Number 18920-16-6

High Purity Sublimed Materials, Host Materials, Materials, OLED Materials, Semiconducting Molecules, TADF Materials

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 (E_T=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 (T_g) 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 T_g at 100 °C.

General Information

CAS number	18920-16-6
Chemical formula	C₄₂H₃₄Si₂
Molecular weight	594.89 g/mol
Absorption	λ_max 265 nm in THF
Fluorescence	λ_em 418 nm
HOMO/LUMO	HOMO = 7.20 eV, LUMO = 2.80 eV, E_T=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	T_g = 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.

Chemical Structure

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
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
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
Max. EQE	19.2 %

Pricing

Grade	Order Code	Quantity	Price
Sublimed(>99.0% purity)	M2270A1	100 mg	£250
Sublimed(>99.0% purity)	M2270A1	250 mg	£500
Sublimed(>99.0% purity)	M2270A1	500 mg	£800
Sublimed(>99.0% purity)	M2270A1	1 g	£1300

MSDS Documentation

UGH3 MSDS sheet

Literature and Reviews

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.
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.
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.

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.
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.
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.