General information

  • Name: BPBPA
  • Full name: N,N′-Tetra(4-biphenyl)benzidine
  • CAS number: 164724-35-0
  • Chemical formula: C60H44N2
  • Molecular weight: 793.03 g/mol
  • Absorption: λmax = 357 nm in DCM
  • Photoluminescence: λmax = 425 nm in DCM
  • HOMO/LUMO: HOMO = 5.3 eV, LUMO = 2.2 eV
  • Synonyms: TBBDAz, N4,N4,N4',N4'-Tetra([1,1'-biphenyl]-4-yl)-[1,1'-biphenyl]-4,4'-diamine
  • Classification: Organic light-emitting diodes, Hole transport layer materials (HTL), Electron blocking layer materials (EBL)
  • Purity: Sublimed: >99.0% (HPLC)
  • Melting point: 265 °C
  • Appearance: White to light yellow powder

BPBPA Specification: Pioneering the Future of OLEDs

The ever-advancing sphere of organic light-emitting diodes (OLEDs) is driven by a wide range of materials and compounds. Among these, BPBPA—fully known as N,N′-Tetra(4-biphenyl)benzidine—stands as a crucial component in the OLED technology stack.

Understanding BPBPA

BPBPA is a molecule formed from two triphenylamine derivatives, making it an electron-rich compound. This unique molecular structure renders it particularly significant in the realm of organic electronic devices, including OLEDs.

Key Features of BPBPA

  • Hole Transport Layer (HTL) Material: Due to its electron-rich structure, BPBPA serves as an excellent material in hole transport layers. This ensures that OLEDs function with optimal efficiency and have extended lifetimes.
  • Electron Blocking Layer (EBL) Material: BPBPA is also employed as an electron blocking layer material, which is vital for the balanced transportation of electrons and holes in OLED devices.
  • High Energy HOMO Orbital: The high energy of BPBPA’s HOMO (Highest Occupied Molecular Orbital) makes it a suitable candidate for organic solar cells, further attesting to its versatility.

The Role of BPBPA in Modern OLEDs

In the current landscape of OLED technology, the demand for materials that offer elevated efficiency, durability, and reduced energy consumption is incessant. BPBPA, with its multifaceted properties, aligns seamlessly with these prerequisites. Its role as an HTL and EBL material ensures not only optimal functionality but also an extended lifespan for OLEDs.


The OLED sector is in a constant state of evolution, driven by the imperative for materials that are both efficient and durable. BPBPA, endowed with a unique set of properties and functionalities, is poised to play a substantial role in shaping the future of OLED technology. As research advances and technology matures, BPBPA is anticipated to find an expanding array of applications in organic electronic devices.

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