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Product Code M2293A1-250mg
Price £300 ex. VAT

BSB, phosphorescent host for blue light-emitting materials

Used to improve device performance of OLEDs

BSB, 4,4'-di(triphenylsilyl)-biphenyl, has a structure of two triphenyllsilanes joined by a biphenyl spacer. The other family member, UGH-2, has a phenyl spacer.

Having a deep HOMO energy level and a wide bandgap, BSB is normally used as phosphorescent host for blue light-emitting materials such as FIrPic. When compared to UGH-2, it has higher glass transition temperature (Tg = 100 °C) to afford better morphology of OLED device films for higher device performance and stability. Electroluminescence devices using FIrpic as the blue phosphorescence dopant and UGH2, BSB, and BST (4,4″-bis(triphenylsilanyl)-(1,1′,4′,1″)-terphenyl) as the hosts show that BSB provides best device performance.

General Information

CAS number 18826-13-6
Chemical formula C48H38Si2
Molecular weight 670.99 g/mol
Absorption λmax 271 nm (dichloromethane)
Photoluminescence λem 432 nm (dichloromethane)
HOMO/LUMO HOMO = 6.5 eV, LUMO = 2.3 eV; ET = 2.76 eV [1]
Chemical name 4,4'-Di(triphenylsilyl)-biphenyl
Synonyms 4,4'-bis-triphenylsilanyl-biphenyl, 4,4'-di(triphenylsilyl)-biphenyl
Classification / Family Arylsilane derivatives, Phosphorescent host materials, Electron transport materials, Hole blocking layer materials, Sublimed materials, Semiconducting small molecules

Product Details

Purity Sublimed >99.0% (HPLC)
Melting point Tg = 100 °C (lit.)
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

BSB chemical structure
Chemical structure of 4,4'-di(triphenylsilyl)-biphenyl (BSB)

Device Structure(s)

Device structure ITO (125 nm)/PEDOT:PSS (35 nm)/CBP:16 wt% FIrpic (10 nm)]/BSB:Spiro-2CBP (3 nm)/Spiro-2CBP:4wt % Ir(2-phq)3 (5 nm)/TPBi (32 nm)/LiF (1 nm)/Al (150 nm) [2]
Colour orange light emitting device Orange
EQE @ 100 cd/m2 22.7%
Current Efficiency @ 100 cd/m2 53.8 cd/A
Power Efficiency @ 100 cd/m2 36.0 Im/W
Device structure ITO (125 nm)/PEDOT:PSS (35 nm)/CBP (10 nm)]/BSB:Spiro-2CBP (3 nm)/Spiro-2CBP:4wt % Ir(2-phq)3 (5 nm)/TPBi (32 nm)/LiF (1 nm)/Al (150 nm) [2]
Colour orange light emitting device Orange
EQE @ 100 cd/m2 17.2%
Current Efficiency @ 100 cd/m2 36.2 cd/A
Power Efficiency @ 100 cd/m2 28.6 Im/W


Grade Order Code Quantity Price
Sublimed (>99.0% purity) M2293A1 250 mg £300
Sublimed (>99.0% purity) M2293A1 500 mg £520
Sublimed (>99.0% purity) M2293A1 1 g £950

MSDS Documentation


Literature and Reviews

  1. Interlayer Engineering with Different Host Material Properties in Blue Phosphorescent Organic Light-Emitting Diodes, J. Lee et al., ETRI J., 33 (1), 32-38 (2011); DOI: 10.4218/etrij.11.0110.0172.
  2. High Efficiency Very Low Color Temperature Phosphorescent Organic Light Emitting Diodes, S. Kumar et al., IPCSIT, 28, 117-121 (2012).
  3. White Organic Light-Emitting Diodes Utilized by Near UV-Deep Blue Emitter and Exciplex Emission, Y. Park et al., J. Nanosci. Nanotechnol., 11 (2); 1381–1384 (2011); DOI: 10.1166/jnn.2011.3376.
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