BSB

CAS Number 18826-13-6

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

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 (T_g = 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	λ_max 271 nm (dichloromethane)
Photoluminescence	λ_em 432 nm (dichloromethane)
HOMO/LUMO	HOMO = 6.5 eV, LUMO = 2.3 eV; E_T = 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	T_g = 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

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
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
EQE @ 100 cd/m²	17.2%
Current Efficiency @ 100 cd/m²	36.2 cd/A
Power Efficiency @ 100 cd/m²	28.6 Im/W

Pricing

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

BSB MSDS sheet

Literature and Reviews

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.
High Efficiency Very Low Color Temperature Phosphorescent Organic Light Emitting Diodes, S. Kumar et al., IPCSIT, 28, 117-121 (2012).
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.

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices, X. Yang et al., Chem. Soc. Rev., 44, 8484-8575 (2015); DOI: 10.1039/C5CS00424A.
Yellow/Orange Emissive Heavy-Metal Complexes as Phosphors in Monochromatic and White Organic Light-Emitting Device, C. Fan et al., Chem. Soc. Rev., 43, 6439-6469 (2014); DOI: 10.1039/C4CS00110A.