TAZ

Order Code: M601
MSDS sheet

Price

(excluding Taxes)

£104.00


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 Sublimed* >99.7%
Melting point  231-235 °C (lit.)
Colour White powder/crystals
*Sublimation is a technique used to obtain ultra pure grade chemicals to get rid of mainly trace metals and inorganic impurities. Sublimation happens under certain pressure for chemicals to only go through two physical stages from a solid sate to vapour (gas) and then the vapour condensed to a solid state on a cool surface (referred to as cold finger). The most typical examples of sublimation are iodine and dry ice. For more details about sublimation, please refer to sublimed materials for OLEDs and perovskites and our collection of sublimed materials.

 

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); CAS No. 150405-69-9; Chemical Formula C30H27N3.

Applications

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 for 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.

  

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 informations please refer to the cited references

Characterisation (HPLC&NMR)

 

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

 

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.