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

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
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
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
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
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
Max. EQE	20.1%
Max. Power Efficiency	41.3 lm W−1

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
Max. EQE	38.4%
Max. Power Efficiency	80.1 lm W−1

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

Characterisation

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 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 materialwith 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.

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To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.

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