BPBPA

CAS Number 164724-35-0

Electron / Hole Transport Layer Materials, High Purity Sublimed Materials, Semiconducting Molecules

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

Applied in OLEDs and solar cells

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High carge carrier mobility

1.74 ×10⁻² cm²/V⋅s

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/LUMO	HOMO = −5.5 eV LUMO = −2.0 eV [1]
Melting Point	T_m = 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

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
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
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

BPBPA MSDS Sheet

Pricing

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

Literature and Reviews

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.
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.
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.

Unveiling the root cause of the efficiency-lifetime trade-off in blue fluorescent organic light-emitting diodes, S. Kang et al., Electron. Mater. Lett., 16, 1–8 (2020); DOI: 10.1007/s13391-019-00180-5.
Conformation-dependent degradation of thermally activated delayed fluorescence materials bearing cycloamino donors, S. Hwang et al., Commun. Chem., 3, 53 (2020); DOI: 10.1038/s42004-020-0303-4.