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TAZ, 3-(Biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole


Product Code M601
Price £135.00 ex. VAT

1,2,4-triazole-based 3-(biphenyl-4-yl)-5-(4-tertbutylphenyl)-4-phenyl-4H-1,2,4-triazole (TAZ) (ET: 2.7 eV, HOMO/LUMO: 6.3/2.7 eV) has mostly been used in blue phosphorescent OLEDs (PhOLEDs) to serve as an efficient electron-transporting and hole-blocking layer due to its high triplet energy level that would confine the triplet excitons within the emissive layer.

The low HOMO/LUMO energy level of TAZ is beneficial for blocking holes and facilitating electron injection/transport, thereby enhancing the device performance.

General Information

CAS number 150405-69-9
Chemical formula C30H27N3
Molecular weight 429.56 g/mol
Absorption λmax 280 nm in chloroform
Fluorescence λem 372 nm in chloroform
HOMO/LUMO HOMO = 6.3 eV, LUMO = 2.7 eV [1]
Synonyms
  • TAZ
  • 3-(Biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole
Classification / Family Triazole derivatives, Electron-injection layer materials (EIL), Electron-transport layer materials (ETL), Hole-blocking layer materials (HBL), Phosphorescent host materials, Organic light-emitting diodes (OLEDs), Organic electronics.

Product Details

Purity  >99.0% (sublimed)
Melting point  231-235 °C (lit.)
Appearance 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

Chemical structure of TAZ
Chemical structure of 3-(Biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole (TAZ)

Device Structure(s)

Device structure ITO/PEDOT:PSS/α-NPD (20 nm)/TCTA (5 nm)/T2T*:(PPy)2Ir(acac)(9:1 wt%) (25 nm)/TAZ (50 nm)/LiF (0.5 nm)/Al (100 nm) [1]
Colour Green  green
Max. Luminance 85,000 cd/m2
Max. Current Efficiency 54 cd/A
Max. EQE     17.4%
Max. Power Efficiency 48 lm W−1 
Device structure ITO/PEDOT:PSS (50 nm)/poly-TCZ (35 nm)/1*:Ir(ppy)3 (94:6 wt%)(20 nm)/TAZ (50 nm)/LiF (2.5 nm)/Al (40 nm)/Ag (100 nm) [2]
Colour Blue  blue
Max. Luminance 47,000 cd/m2
Max. Current Efficiency 81.1 cd/A
Max. EQE 25.2%
Max. Power Efficiency 46.8 lm W−1 
Device structure MoO3 (3 nm)/CBP: 20 wt% Ir(ppy)3: 4 wt% FIrpic (30 nm)/TAZ (50 nm) [3]
Colour Green  green
Max. Luminance 27,524 cd/m2
Max. Current Efficiency 71.2 cd/A
Device structure ITO/NPB (50nm)/mCP (10 nm)/CbzTAZ:15 wt%FIripic (35 nm)/TAZ (30 nm)/LiF (1 nm)/Al (120 nm) [5]
Colour Blue   blue
Max. EQE >23%
Max. Current Efficiency >45 cd/A
Max. Power Efficiency >40 lm W−1 
Device structure ITO/MoO3 (7nm)/NPB (85 nm)/ (PPQ)2Ir(acac):Ir(ppy)3:FIrpic:mCP/TAZ/LiF/Al [6]
Colour White  white
Max. EQE 20.1%
Max. Power Efficiency 41.3 lm W1
Device structure

ITO/HATCN (5 nm)/NPB (40 nm)/TCTA (10 nm)/mCP:6 wt%2CzPN (11 nm)/TAZ:4 wt% PO-01 (4 nm)/TAZ (40 nm)/LiF (0.5 nm)/Al (150 nm) [7]

Colour White  white
Max. EQE 38.4%
Max. Power Efficiency 80.1 lm W1

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

Characterisation

H NMR of 3-(Biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole in CDCl
1H NMR of 3-(Biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole in CDCl3
HPLC trace of TAZ
HPLC trace of 3-(Biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole (TAZ)

Pricing

Grade Order Code Quantity Price
Sublimed (>99.0% purity) M601 250 mg £135.00
Sublimed (>99.0% purity) M601 500 mg £216.00
Sublimed (>99.0% purity) M601 1 g
£346.00

MSDS Documentation

TAZ MSDSTAZ MSDS sheet

Literature and Reviews

  1. 1,3,5-Triazine derivatives as new electron transport–type host materials for highly efficient green phosphorescent OLEDs,H-Fan Chen et al., J. Mater. Chem., 19, 8112–8118 (2009). 
  2. Efficient blue-emitting electrophosphorescent organic light-emitting diodes using 2-(3,5-di(carbazol-9-yl)-phenyl)-5-phenyl-1,3,4-oxadiazole as an ambipolar host, Y. Zhang et al., RSC Adv., 3, 23514 (2013). DOI: 10.1039/c3ra43720e.
  3. Simplified phosphorescent organic light-emitting devices using heavy doping with an Ir complex as an emitter, Y. Miao et al., RSC Adv., 5, 4261 (2015). DOI: 10.1039/c4ra13308k.
  4. Harvesting Excitons Via Two Parallel Channels for Efficient White Organic LEDs with Nearly 100% Internal Quantum Efficiency: Fabrication and Emission- Mechanism Analysis, Q. Wang et al., Adv. Funct. Mater., 19, 84–95 (2009). DOI: 10.1002/adfm.200800918.
  5. High Efficiency Blue Phosphorescence Organic Light Emitting Device with Novel CbzTAZ host, T-L. Chiu et al., SID DIGEST, 1407-1409 (2013); doi/10.1002/j.2168-0159.2013.tb06506.x.
  6. Manipulating Charges and Excitons within aSingle-Host System to Accomplish Efficiency/CRI/Color-Stability Trade-off for High-PerformanceOWLEDs, Q. Wang et al., Adv. Mater., 21, 2397–2401 (2009).
  7. Highly efficient and color-stable hybrid warm white organic light-emitting diodes using a blue material
    with thermally activated delayed fluorescence, D. Zhang et al., J. Mater. Chem. C, 2, 8191-8197 (2014); DOI: 10.1039/c4tc01289e.
  8. High-efficiency and low-voltage p - i - n electrophosphorescent organic light-emitting diodes with double-emission layers, G. He et al., Appl. Phys. Lett., 85, 3911 (2004); doi: 10.1063/1.1812378.
  9. Highly Efficient Organic Blue Electrophosphorescent Devices Based on 3,6-Bis(triphenylsilyl)carbazole as the Host Material, M-H. Tsai et al., Adv. Mater., 18, 1216–1220 (2006). 10.1002/adma.200502283.

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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