
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 |
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. For more details about sublimation, please refer to the Sublimed Materials for OLED devices page.
Chemical Structure

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 ![]() |
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 ![]() |
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 ![]() |
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 ![]() |
Max. EQE | 25.5% |
Max. Power Efficiency | 52.1 Im/W |
*For chemical structure information, please refer to the cited references.
Pricing
Grade | Order Code | Quantity | Price |
Sublimed (>99.0% purity) | M2105A1 | 250 mg | £213.00 |
Sublimed (>99.0% purity) | M2105A1 | 500 mg | £345.00 |
Sublimed (>99.0% purity) | M2105A1 | 1 g | £559.00 |
MSDS Documentation
DPEPO MSDS sheet
Literature and Reviews
- 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.
- 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.
- 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.
- 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.
- 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 technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.
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我们产品注册的时候在安全性说明上标明了该仪器由专业人员操作,所以不考虑这条。但是药监局老师说应该考虑。请教各位,这个如果考虑的话,该怎么进行符合性证明?如果可以不考虑的话,请问有什么法规或文件支持?

