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Product Code M2105A1-250mg
Price $325.00 ex. VAT

DPEPO, one of the most popular materials used to host blue TADF-based OLEDs

High-purity (>99.0%) and available online for priority dispatch

DPEPO, with steric ortho-substituted diphenylphosphine oxide (DPPO) groups, is one of the most popular large band-gap materials used to host blue TADF-based OLEDs.

This substitution with electron-withdrawing DPPO moieties not only improves its thermal and morphological stability, but also makes DPEPO an electron-transport layer material. Because of its deep HOMO energy level, DPEPO also acts as a hole-blocking layer material in TADF-OLED devices.

General Information

CAS number 808142-23-6
Full name Bis[2-(diphenylphosphino)phenyl]ether oxide
Synonyms DPEPO
Chemical formula C36H28O3P2
Molecular weight 570.55 g/mol
Absorption* λmax 388 nm in CH2Cl2
Fluorescence λem 311 nm in CH2Cl2
HOMO/LUMO HOMO = 6.1 eV, LUMO = 2.0 eV; T1 = 3.0 eV [1]
Classification / Family Diphenyl ether (DPE), TADF blue emitter host materials, Electron-transport layer materials (ETL), Hole-blocking layer materials (HBL), Phosphorescent organic light-emitting devices (PHOLEDs), Sublimed materials

* Measurable with an Optical Spectrometer, see our spectrometer application notes.

Product Details

Purity Sublimed* >99.0% (HPLC)
Melting point TGA: >320 °C (0.5% weight loss)
Appearance White powder/crystals

* Sublimation is a technique used to obtain ultra pure-grade chemicals, please refer to sublimed materials for OLED devices for more information.

Chemical Structure

chemical structure of DPEPO
Chemical structure of  Bis[2-(diphenylphosphino)phenyl]ether oxide (DPEPO)

Device Structure(s)

Device structure ITO/HATCN (5 nm)/NPB (30 nm)/TCTA (10 nm)/mCP (10 nm)/DMAC-DPS:PO-01* (0.8 wt% 30 nm)/DPEPO (10 nm)/Bphen (30 nm)/LiF (0.5 nm)/Al(150 nm) [2]
Colour White white light emitting device
Max. EQE 20.8%
Max. Power Efficiency 51.2 lm/W
Device structure ITO (110 nm)/TAPC (35 nm)/mCBP (5 nm)/6 wt%-Ac-OSO:DPEPO (20 nm)/DPEPO (10 nm)/B3PyPB (40 nm)/LiF (0.8 nm)/Al (80 nm) [3]
Colour Blue blue light emitting device
Max. Current Efficiency 37.9 cd/A
Max. EQE 20.5%
Max. Power Efficiency 20.1 Im/W
Device structure ITO/a-NPD (30 nm)/TCTA (20 nm)/CzSi (10 nm)/EML (20 nm)/ DPEPO (10 nm)/TPBI (30 nm)/LiF (0.5 nm)/Al [4]
Colour Blue blue light emitting device
Max. EQE 14.5%
Max. Luminesence 2544 cd/m2
Device structure PEDOT:PSS (60 nm)/TAPC (20 nm)/mCP (10 nm)/DPEPO: TmCzTrz (25 nm)/TSPO1 (5 nm)/TPBI (20 nm)/LiF (1 nm)/Al (200 nm) [5]
Colour Blue blue light emitting device
Max. EQE 25.5%
Max. Power Efficiency 52.1 Im/W

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


 Grade Order Code Quantity Price
Sublimed (>99.0% purity) M2105A1 250 mg £260
Sublimed (>99.0% purity) M2105A1 500 mg £420
Sublimed (>99.0% purity) M2105A1 1 g £680

MSDS Documentation


Literature and Reviews

  1. Triplet exciton confinement in green organic light-emitting diodes containing luminescent charge-transfer Cu(I) complexes, Q. Zhang, et al., Adv. Funct. Mater.22, 2327–2336 (2012); DOI: 10.1002/adfm.201101907.
  2. Highly Efficient Simplified Single-Emitting-Layer Hybrid WOLEDs with Low Roll-off and Good Color Stability through Enhanced Förster Energy Transfer, D. Zhang et al., ACS Appl. Mater. Interfaces, 7 (51), 28693–28700 (2015); DOI: 10.1021/acsami.5b10783.
  3. High-Efficiency Blue Organic Light-Emitting Diodes Based on Thermally Activated Delayed Fluorescence from Phenoxaphosphine and Phenoxathiin Derivatives, S. Lee et al., Adv. Mater., 28, 4626–4631 (2016); DOI: 10.1002/adma.201506391.
  4. High-efficiency deep-blue organic light-emitting diodes based on a thermally activated delayed fluorescence emitter, S. Wu et al., J. Mater. Chem. C, 2,421 (2014); DOI: 10.1039/c3tc31936a.
  5. Design Strategy for 25% External Quantum Effi ciency in Green and Blue Thermally Activated Delayed Fluorescent Devices, D. Lee et al., Adv. Mater. 2015, 27, 5861–5867 (2015); DOI: 10.1002/adma.201502053.

To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.

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