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All Semiconducting Molecules, Materials, OLED Host Materials, Sublimed Materials, TADF Materials, Transport Layer Materials

Product Code M2266A1-100mg
Price $200 ex. VAT

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High purity PO-T2T, low price with additional savings for quantities of 5 g or more

Popular TADF host and exciplex material, also used as transport layer material in organic electronic devices

PO-T2T, known in full as 2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine, is an electron deficient semiconducting molecule with a triazine centre and three diphenylphosphines.

Exciplex-forming with other electron donating host materials such as mCP, PO-T2T is a popular TADF host material with a high triplet energy level. The forming of exciplexes between mCP and PO-T2T is efficient, as is the energy transfer from such an exciplex to a blue phosphorescent dopant such as FIrpic. This enables triplet harvesting without energy loss.

Because of its electron-deficient nature with a deep highest occupied molecular orbital (HOMO = 7.55 eV), PO-T2T is also used as electron transport layer (ETL) / hole blocking layer (HBL) material in organic electronic devices.

Together with other electron donating materials, PO-T2T as universal exciplex hosts with improved device lifetime, efficiency and lower driving voltage.

Guest Exciplex Host Color Efficiencies DOI
FIrPic mCBP:PO-T2T Sky-Blue Phosphorescent  EQE: 34.1%
Max. PE: 79.6 lm W−1
4CzIPN CBP:PO-T2T Green TADF EQE: 20.0%
Max. PE: 62.1 lm W−1
Ir(mphmq)2tmd NPB:PO-T2T Red phosphorescent EQE: 34.1%
Max. PE: 62.2 lm W−1
2CzPN, AnbTPA CDBP:PO-T2T White TADF EQE: 19.2%
Max. PE: 46.2 lm W−1

Highly efficient thermally activated delayed fluorescence (TADF) exhibiting high reverse intersystem crossing (RISC) yields by using PO-T2T as the acceptor unit to form exciplex emitting layer.

Exciplex Emission Layer Color Efficiencies DOI
DMAC-DPS:PO-T2T  536 nm to 496 nm EQE: 10.4–12.1%
Max. PE: 24.2–39.5 lm W−1
MAC:PO-T2T Green TADF EQE: 17.8%
Max. PE: 45.5 lm W−1
TSBPA:PO-T2T Green TADF EQE: 14.8%
Ir(ppy)3:PO-T2T Red TADF EQE: 5% 10.3389/fchem.2019.00016

General Information

CAS number 1646906-26-4
Chemical formula C57H42N3O3P3
Molecular weight 909.80 g/mol
Absorption λmax 272 nm (in DCM)
Fluorescence λem 295 nm, 378 nm(in DCM)
HOMO/LUMO HOMO = 7.55 eV, LUMO = 3.50 eV [1]; ET= 2.99 eV
Full chemical name 2,4,6-Tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine
Synonyms POT2T
Classification / Family Triazine derivatives, TADF exciplex co-host, phosphorescent organic light-emitting devices (PHOLEDs), TADF phosphorescent host, electron transport layer materials, sublimed materials

Product Details

Purity Sublimed* >99.5% (HPLC)
Melting point TGA 460 °C (0.5% weight loss)
Appearance Off-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

PO-T2T chemical structure
Chemical structure of 2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine (PO-T2T), CAS 1646906-26-4

Device Structure(s)

Device structure ITO/MoO3(10 nm)/TAPC:MoO3 (20.0%, 50 nm)/CDBP (10 nm)/
dCDBP:PO-T2T:PO-01 (1:1, 0.3%, 20 nm)/PO-T2T (10 nm)/PO-T2T:Li2CO3 (3%,45 nm)/Li2CO3 (1 nm)/Al (100 nm) [2]
Colour White white light emitting device
Max. Current Efficiency 88.7 cd/A
Max. EQE 28.3 %
Max. Power Efficiency 102.9 Im/W
Device structure ITO/PEDOT:PSS (30 nm)/TPAC (20 nm)/mCP (15 nm)/
mCP:PO-T2T (1:1, 20 nm)/PO-T2T (45 nm)/Liq (1 nm)/Al (1 nm)/MoO3(5 nm)/DTAF (20 nm)/DTAF:PO-T2T (1:1, 20 nm)/PO-T2T(50 nm)/Liq (0.5 nm)/Al (100 nm). [3]
Colour White white light emitting device
Max. Current Efficiency 27.7 cd/A
Max. EQE 11.6 %
Max. Power Efficiency 15.8 Im/W
Device structure ITO/4% ReO3: mCP (60 nm)/ mCP (15 nm)/ CN-Cz2:PO-T2T (1:1 w%) (20 nm)/PO-T2T (10 nm)/CN-T2T (40 nm)/Liq (0.5 nm)/Al (100 nm). [4]
Colour White white light emitting device
Max. Current Efficiency 37.8cd/A
Max. EQE 16%
Max. Power Efficiency 47.5 Im/W
Device structure ITO/MoO3 (3nm)/TAPC (35 nm)/CBP:TTM-3PCz (3.0 wt %) (25 nm)/B3PYMPM (10 nm)/PO-T2T (70 nm)/LiF (0.8 nm)/Al (100 nm) [5]
Colour Deep-red, NIR deep red light emitting device
Max. EQE 26.5%


Quantity Grade Product Code Price
100 mg Sublimed (>99.5% purity) M2266A1 £160
250 mg Sublimed (>99.5% purity) M2266A1 £320
500 mg Sublimed (>99.5% purity) M2266A1 £520
1 g Sublimed (>99.5% purity) M2266A1 £850
5 g (most popular) Sublimed (>99.5% purity) M2266A1 £1850
10 g Sublimed (>99.5% purity) M2266A1 £3100
25 g Sublimed (>99.5% purity) M2266A1 £7000

Please contact us for quantities over 50g and up to 1kg.

MSDS Documentation


Literature and Reviews

  1. An Exciplex Forming Host for Highly Efficient Blue Organic Light Emitting Diodes with Low Driving Voltage, J-H. Lee et al., Adv. Funct. Mater., 25 (3), 361-366 (2014); DOI: 10.1002/adfm.201402707.
  2. Precise Exciton Allocation for Highly Efficient White Organic Light-Emitting Diodes with Low Efficiency Roll-Off Based on Blue Thermally Activated Delayed Fluorescent Exciplex Emission, Z. Wu et al., Adv. Optical Mater., 1700415 (2017); DOI: 10.1002/adom.201700415.
  3. The First Tandem, All-exciplex-based WOLED, W. Hung et al., Sci. Rep., 4, 5161 (2014); DOI: 10.1038/srep05161.
  4. Probe exciplex structure of highly efficient thermally activated delayed fluorescence organic light emitting diodes, T-C. Lin et al., Nature Commun., 9, 3111 (2018) DOI: 10.1038/s41467-018-05527-4.
  5. Efficient radical-based light-emitting diodes with doublet emission, X. Ai et al., Nature 563, 536–540(2018); DOI: 10.1038/s41586-018-0695-9.
  6. High-efficiency organic light-emitting diodes with exciplex hosts, Q. Wang et al., J. Mater. Chem. C, 7, 11329 (2019); DOI: 10.1039/c9tc03092a.

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. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, military, pharmaceuticals, cosmetics, food, or commercial applications.

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