At NINGBO INNO PHARMCHEM CO.,LTD., we are experts in delivering the high-purity chemical compounds that power modern electronic innovations. Bis[2-(diphenylphosphino)phenyl] Ether Oxide (DPEPO), CAS: 808142-23-6, is one such critical material, underpinning the remarkable advancements seen in organic light-emitting diode (OLED) technology.

The efficacy of DPEPO in OLEDs stems directly from its unique chemical structure and resulting physical properties. Structurally, DPEPO is characterized by a diphenyl ether core connecting two diphenylphosphine oxide groups. This molecular design is key to its functionality.

Chemical Formula and Molecular Weight: With a molecular formula of C₃₆H₂₈O₃P₂, DPEPO has a molecular weight of approximately 570.55 g/mol. This substantial molecular weight and complex structure contribute to its thermal stability and its ability to form stable thin films required for OLED fabrication.

Appearance and Physical State: DPEPO typically appears as a white powder or crystalline solid. This physical state is convenient for handling and processing in both laboratory research and industrial manufacturing environments. Its solid form at room temperature is indicative of strong intermolecular forces.

Thermal Properties: A crucial property for OLED materials is thermal stability. DPEPO exhibits a high melting point, generally reported around 280°C. This high melting point signifies robust molecular integrity and resistance to thermal degradation during device operation or the vacuum deposition process used in OLED manufacturing. Its predicted boiling point of around 753°C further emphasizes its thermal resilience.

Solubility: DPEPO is generally soluble in common organic solvents such as chloroform, tetrahydrofuran (THF), and toluene. This solubility is important for solution-based processing methods, though vacuum sublimation is more commonly used for achieving the ultra-high purity required for electronic applications.

Electronic Properties (HOMO/LUMO Levels): The electronic structure of DPEPO is central to its function in OLEDs. It possesses a high Highest Occupied Molecular Orbital (HOMO) energy level (around 6.1 eV) and a relatively low Lowest Unoccupied Molecular Orbital (LUMO) energy level (around 2.0 eV). The wide energy gap (4.1 eV) between HOMO and LUMO makes it an excellent wide-bandgap material.

  • The deep HOMO level makes DPEPO an effective hole-blocking layer (HBL), preventing holes from migrating past the emissive layer and reducing charge recombination efficiency.
  • The favorable LUMO level facilitates efficient electron injection and transport, making it an excellent electron transport layer (ETL).

Photophysical Properties: DPEPO exhibits absorption at around 292 nm and 388 nm, and photoluminescence at 311 nm (in dichloromethane). These properties are important for understanding its interaction with light and its role in energy transfer within the OLED device.

At NINGBO INNO PHARMCHEM CO.,LTD., we leverage these fundamental chemical properties through precise synthesis and rigorous purification, including sublimation, to provide DPEPO that consistently meets the exacting demands of the OLED industry. Its chemical backbone provides the stability, charge transport capabilities, and electronic characteristics necessary for the bright, efficient, and long-lasting displays that consumers expect.