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Product Code M2436A1-500mg
Price £150 ex. VAT

An Electron-Rich Triarylamine Derivative

Widely used as hole transport layer in OLEDs and solar cells

BPBPA (CAS number 164724-35-0) is a benzidine derivative with two amines substituted by four biphenyl groups. It demonstrates high charge carrier mobility of 1.74 ×10−2 cm2/V⋅s, enabling rapid hole-extraction from the adjacent donor layer. This results in an enhanced open-circuit voltage and leads to an improvement of powder conversion efficiency (PCE) of 9% with reference devices.

BPBPA is commonly used as a hole transport layer (HTL) material in OLEDs. The molecule has a highest occupied molecular orbital (HOMO) energy value at −5.5 eV and a lowest unoccupied molecular orbital (LUMO) energy value at −2.0 eV. The work function of BPBPA conveniently matches with other materials, making it suitable as a reference HTL in the investigation of high-efficiency fluorescent emitters.

Hole transport material

Hole transport material

Applied in OLEDs and solar cells

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Demonstrate high carge carrier mobility

High carge carrier mobility

1.74 ×10−2 cm2/V⋅s

Sublimed grade purity 164724-35-0

Sublimed grade purity

>99.5% Grade purity

General Information

CAS Number 164724-35-0
Full Name N,N,N',N'-Tetra(4-biphenylyl)-4,4'-biphenyldiamine
Chemical Formula C60H44N2
Molecular Weight 793.03 g/mol
Purity Sublimed >99.5% (HPLC)
Charge Carrier Mobility μ = 1.74 × 10−2 cm2/V⋅s [1]

HOMO = −5.5 eV

LUMO = −2.0 eV [1]

Melting Point Tm = 265 °C
Appearance Off-white powder
Synonyms N,N,N',N'-Tetrakis(4-biphenylyl)benzidine, N4,N4,N4',N4'-Tetra[(1,1'-biphenyl)-4-yl]-(1,1'-biphenyl)-4,4'-diamine, N,N'-Tetra(4-biphenyl)benzidine, 4-Phenyl-n-(4-phenylphenyl)-N-[4-[4-(4-phenyl-N-(4-phenylphenyl)anilino)phenyl]phenyl]aniline, TBB, TBBDA
Classification or Family Hole transport layers, Hole extraction materials, Sublimed materials, Semiconducting molecules, Benzidines, OLEDs, Solar cells

Chemical Structure

BPBPA chemical structure, CAS 164724-35-0
BPBPA chemical structure, CAS 164724-35-0

Device Structure(s)

Device Structure ITO (50 nm)/BPBPA (30%):HATCN (40 nm)/BPBPA (10 nm)/TNPA (10 nm)/a-ADN:IDCz-2DPA (5%) (30 nm)/TNPT (5 nm)/ZADN (20 nm)/LiF(1.5 nm)/Al (200 nm) [2]
Colour Blue light emitting device Blue
External Quantum Efficiency 5.6%
Current Efficiency 6.4 cd/A
Maximum Luminance 47600 cd/cm-2
Turn On Voltage 3.0 V
Device Structure ITO/DNTPD (60 nm)/BPBPA (20 nm)/PCzAC (10 nm)/mCBP:PTZ-TRZ(30 nm)/DBF-Trz (5 nm)/ZADN (30 nm)/LiF:Al [5]
Colour Blue light emitting device Blue
External Quantum Efficiency 13%
Current Efficiency 42 cd/A
Power Efficiency 20 lm/W
Voltage at 200 cd/cm-2 2.53 V

*For chemical structure information, please refer to the cited references.

MSDS Documentation



Product Code Quantity Price
M2436A1 500 mg £150
M2436A1 1 g £250
M2436A1 2 g £400
M2436A1 5 g £800

Literature and Reviews

  1. High mobility hole extraction material for organic solar cell application, G. Kim et al., Mol. Cryst. Liq. Cryst., 565 (1), 14–21 (2012); DOI: 10.1080/15421406.2012.690989.
  2. A novel fluorene–indolocarbazole hybrid chromophore to assemble high efficiency deep-blue fluorescent emitters with extended device lifetime, V. Patil et al., J. Mater. Chem. C, 8, 3051 (2020); DOI: 10.1039/c9tc06434f.
  3. Isomeric fused benzocarbazole as a chromophore for blue fluorescent organic light-emitting diodes, V. Patil et al., J. Mater. Chem. C, 8, 8320 (2020); DOI: 10.1039/d0tc01268h.
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