DPEPO

CAS Number 808142-23-6

Electron / Hole Transport Layer Materials, High Purity Sublimed Materials, Host Materials, Semiconducting Molecules, TADF Materials

MSDS

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*	λ_max 388 nm in CH₂Cl₂
Fluorescence	λ_em 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 more information.

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	£290
Sublimed (>99.0% purity)	M2105A1	500 mg	£460
Sublimed (>99.0% purity)	M2105A1	1 g	£740

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.