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Product Code M2128A1-100mg
Price £260 ex. VAT

TXO-TPA, red dopant material in TADF-OLED devices

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

TXO-TPA has an ambipolar D-A type structure with TXO as the electron-accepting and triphenylamine (TPA) as the electron-donating unit. The twice-oxidised thiophene on TXO moiety can greatly enhance the electron-accepting ability as the channel for higher electron mobility. On the other hand, electron-rich TPA is used as the channel for higher hole mobility.

TXO-TPA is commonly used as a red dopant material in TADF-OLED devices. This is due to its high device performance capabilities with high external quantum efficiency (EQE).

General Information

CAS number 1623010-63-8
Full name 2-[4-(diphenylamino)phenyl]-10,10-dioxide-9H-thioxanthen-9-one
Chemical formula C31H21NO3S
Molecular weight 487.57 g/mol
Absorption λmax 310, 375 nm in film
Fluorescence λem 625 nm in film
HOMO/LUMO HOMO 5.37 eV, LUMO 3.49 eV [1]
Synonyms 9-H-Thioxanthen-9-one-10,10-dioxide-triphenylamine
Classification / Family Thioxanthone derivatives, Organic electronics, TADF-OLEDs, TADF red dopant materials, Sublimed materials.

Product Details

Purity Sublimed >99.0% (HPLC)
Melting point TGA: >250 °C (0.5% weight loss)
Appearance Orange powder/crystals

*Sublimation is a technique used to obtain ultra pure-grade chemicals. For more details about sublimation, please refer to the Sublimed Materials.

Chemical Structure

TXO-TPA chemical structure
Chemical structure of TXO-TPA

Device Structure(s)

Device structure ITO/PEDOT (30 nm)/TAPC (20 nm)/5 wt%TXO-TPA:mCP (35 nm) /TmPyPB (55 nm)/LiF(0.9 nm)/Al [1]
Colour Yellow yellow light emitting device
Current Efficiency@100 cd/m2 43.3 cd/A 
EQE@100 cd/m2 18.5 %
Power Efficiency@100 cd/m2 47.4 lm W-1
Device structure ITO/PEDOT (20 nm)/TAPC (30 nm)/TXO-TPA (0.5 nm)/4P-NPB* (0.5 nm)/mCP (10 nm)/TmPyPB (50 nm)/LiF (0.9 nm)/Al (100 nm) [2]
Colour White white light emitting device
Max. Current Efficiency 10.5 cd/A 
Max. EQE 4.4%
Max. Power Efficiency 8.9 lm W-1

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


Grade Order Code Quantity Price
Sublimed (>99% purity) M2128A1 100 mg £260
Sublimed (>99% purity) M2128A1 250 mg £520
Sublimed (>99% purity) M2128A1 500 mg £900
Sublimed (>99% purity) M2128A1 1 g £1450

Literature and Reviews

  1. Novel Thermally Activated Delayed Fluorescence Materials–Thioxanthone Derivatives and Their Applications for Highly Efficient OLEDs, H. Wang et al., Adv. Mater., 26, 5198–5204 (2014); DOI: 10.1002/adma.201401393.
  2. White organic light emitting diodes based on a yellow thermally activated delayed fluorescent emitter and blue fluorescent emitter, L. Meng et al., RSC Adv., 5, 59137-59141 (2015); DOI: 10.1039/C5RA09168C.
  3. Purely Organic Thermally Activated Delayed Fluorescence Materials for Organic Light‐Emitting Diodes, M. Wong et al., Adv.Mater., 29, 1605444 (2017); DOI: 10.1002/adma.201605444.
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