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Product Code M451
Price $207.00 ex. VAT

OXD-7, high efficiency ETL material

With PVK, good solubility and film morphology

1,3-bis[2-(4-tert-butylphenyl)-1,3,4-oxadiazo-5-yl]benzene (OXD-7) is a well known electron-transporting material due to the electron-accepting property of the oxadiazole units. Together with poly(9-vinylcarbazole) (PVK, electron donating), OXD-7 (electron withdrawing) is the most widely used hybrid-type host due to its good solubility and film morphology by the bulky tert-butyl units.

OXD-7 has also been used as an ultraviolet emitter, with MoO3 as hole injection and buffer material showing relatively high external quantum efficiency [1].

General Information

CAS number 138372-67-5
Chemical formula C30H30N4O2
Molecular weight 478.58 g/mol
Absorption λmax 292 (THF)
Fluorescence λem 347 nm (THF)
HOMO/LUMO HOMO = 6.5 eV, LUMO = 3.0 eV
  • 1,3-Bis[2-(4-tert-butylphenyl)-1,3,4-oxadiazo-5-yl]benzene
  • 1,3-Bis[5-(4-tert-butylphenyl)-2-[1,3,4]oxadiazolyl]benzene
Classification / Family

Electron-injection materials, Electron transporting materials, Phosphorescent host materials, Organic light-emitting diodes, Organic electronics

Product Details

Purity > 99.0% (sublimed)
Melting point 241 °C (lit.)
Colour 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

OXD-7 chemical structure
Chemical Structure of 1,3-bis[2-(4-tert-butylphenyl)-1,3,4-oxadiazo-5-yl]benzene (OXD-7)

Device Structure(s)

Device structure ITO/PEDOT:PSS/PVK:OXD-7:TPD:(Et-Cvz-PhQ)2Ir(pic)*/OXD-7 (20 nm)/Ba (3 nm)/Al (100 nm) [6]
Colour Red red light emitting device
Max. Current Efficiency 17.5 cd/A 
Max. EQE 10.6%
Max. Power Efficiency 6.42 lm W1

Device structure

ITO/PEDOT:PSS(40 nm)/mCP:PVK:OXD-7(33:33:22 wt%):
(EO2- Cz-PhQ)2Ir(acac)*(12:0.25:0.15 wt%)
(50-60 nm)/TmPyPB(20 nm)/LiF(1 nm)/Al(150 nm) [7]
Colour   White white light emitting device
Max. EQE


Max. Current Efficiency 23.04 cd/A
Max. Power Efficiency 8.04 lm W1
Device structure ITO/PEDOT:PSS/NPB/mCP/FPt*(1.5 nm)/OXD-7/CsF/Al [8]
Colour White white light emitting device
Max. EQE 17.5%
Max. Power Efficiency 45 lm W1
Device structure ITO/ PEDOT:PSS 1.5 (75 nm)/PVK:OXD-7:complex 5 (100:37:8 w/w) (80 nm)/Ba (4 nm)/Al (100 nm) [9]
Colour Blue blue light emitting device
Max. EQE 8.7%
Max. Current Efficiency      19.1 cd/A
Max. Power Efficiency      6.6 lm W1
Device structure  ITO/PEDOT:PSS/ PVK :OXD-7:Ir(mppy)3 (60:40:4, w/w)/TrOH*/Al [10]
Colour Green green light emitting device
Max. Luminance 18,050
Max. EQE 6.7%
Max. Current Efficiency 23.4 cd/A
Device structure ITO/MoOx/PVK:OXD-7:FIrpic (70:30:10/B1Mo/Al [11]
Colour Blue blue light emitting device
Max. Luminance 42,000
Max. EQE 15.4%
Max. Current Efficiency 30 cd/A
Max. Power Efficiency 12.5 lm W1
Device structure        ITO/PEDOT:PSS/PVK:OXD-7:FIrpic (60:40:10 w/w, 70 nm)/SPDP* (15 nm) LiF (1 nm)/Al (100 nm) [12]
Colour Blue blue light emitting device
Max. EQE 19.6%
Max. Current Efficiency 33.6 cd/A
Max. Power Efficiency 10.6 lm W1

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


1H NMR oxd-7
11H NMR of 1,3-bis[2-(4-tert-butylphenyl)-1,3,4-oxadiazo-5-yl]benzene (OXD-7) in CDCl3


Grade Order Code Quantity Price
Sublimed (>99% purity) M451 250 mg £165
Sublimed (>99% purity) M451 500 mg £290
Sublimed (>99% purity) M451 1 g

MSDS Documentation


Literature and Reviews

  1. <Highly efficient ultraviolet organic light-emitting diodes and interface study using impedance spectroscopy, Q. Zhang et al., Electron Optics, 126 (18), 1595-1597 (2015).
  2. Small Molecule Host Materials for Solution Processed Phosphorescent Organic Light-Emitting Diodes, K. Yook et al., Adv. Mater., 26, 4218–4233 (2014).
  3. High power efficiency solution-processed double-layer blue phosphorescent organic light-emitting diode by controlling charge transport at the emissive layer and heterojunction, K. Yeoh et al., Phys. Status Solidi RRL 7, No. 6, 421–424 (2013) / DOI 10.1002/pssr.201307089.
  4. Highly efficient solution processed blue organic electrophosphorescence with 14lm∕W luminous efficacy, M. K. Mathai et al., Appl. Phys. Lett. 88, 243512 (2006);
  5. Efficient solution-processed small-molecule single emitting layer electrophosphorescent white light-emitting diodes, L. Hou et al., Org. Electronics, 11 (8), 1344-1350 (2010), doi:10.1016/j.orgel.2010.05.015.
  6. High efficiency, solution-processed, red phosphorescent organic light-emitting diodes from a polymer doped with iridium complexes, M. Song et al., Org. Electronics, 10 (7), 1412–1415 (2009), doi:10.1016/j.orgel.2009.07.012.
  7. Single emissive layer white phosphorescent organic light-emitting diodes based on solution-processed iridium complexes, W. Cho et al., Dyes and Pigments, 108, 115-120 (2014), doi:10.1016/j.dyepig.2014.04.033.
  8. Efficient organic light-emitting devices with platinum-complex emissive layer, X. Yang et al., Appl. Phys. Lett., 98, 033302 (2011); doi: 10.1063/1.3541447.
  9. Cyclometalated Ir(III) Complexes for High-Efficiency SolutionProcessable Blue PhOLEDs, V. Kozhevnikov et al., Chem. Mater., 25, 2352−2358 (2013);
  10. Efficient phosphorescent polymer light-emitting devices using a conjugated starburst macromolecule as a cathode interlayer, X. Zhang et al., RSC Adv., 6, 10326 (2016); DOI: 10.1039/c5ra19156d.
  11. Water-Soluble Lacunary Polyoxometalates with Excellent Electron Mobilities and Hole Blocking Capabilities for High Efficiency Fluorescent and Phosphorescent Organic Light Emitting Diodes, M. Tountas et al., Adv. Funct. Mater. 2016; DOI: 10.1002/adfm.201504832.
  12. New sulfone-based electron-transport materials with high triplet energy for highly efficient blue phosphorescent organic light-emitting diodes, S. Jeon et al., J. Mater. Chem. C, 2, 10129-10137 (2014); DOI: 10.1039/C4TC01474J.

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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