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

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.

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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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