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Product Code M2128A1
Price £197.00

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
Fluorescene 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 for OLED devices page.

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
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
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 £197.00
Sublimed (>99% purity) M2128A1 250 mg £394.00
Sublimed (>99% purity) M2128A1 500 mg £669.00
Sublimed (>99% purity) M2128A1 1 g £1070.00

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.
  4. Impact of Dielectric Constant on the Singlet−Triplet Gap in Thermally Activated Delayed Fluorescence Materials, H. Sun et al., J. Phys. Chem. Lett., 8, 2393−2398 (2017); DOI: 10.1021/acs.jpclett.7b00688.

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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