Having three carbazole units as the pendants and triarylamine at the core, tris(4-carbazoyl-9-ylphenyl)amine (TCTA) is electron-rich. As a result, it is widely used as a hole-transport and hole-injection material in light-emitting diodes and perovskite solar cells. With low electron mobility, TCTA has also been used as exciton/electron blocking layer materials because of its high lying LUMO energy level (LUMO = 2.4 eV).

TCTA is also a very popular phosphorescent host material due to its large band gap (E_g = 3.4 eV) for green, red and white phosphorescent organic light-emitting diodes (PhOLEDs).

General Information

CAS number	139092-78-7
Chemical formula	C54H36N4
Molecular weight	740.89 g/mol
Absorption	λmax 293 and 326 nm (THF)
Fluorescence	λem 385 nm (THF)
HOMO/LUMO	HOMO = 5.83 eV, LUMO = 2.43 eV [1]
Synonyms	TCTA, 4,4",4"-Tris(carbazol-9-yl)triphenylamine Tris(4-carbazoyl-9-ylphenyl)amine
Classification / Family	Carbazole derivatives, Hole-injection layer materials, Hole-transporting layer materials, Phosphorescent host materials, Electron-blocking layer materials, Light-emitting diodes

Product Details

Purity	>99.5% (sublimed)  >98.0% (unsublimed)
Melting point	298~300 °C
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/MoO3 (8 nm)/(NPB)(80 nm)/TAPC(5 nm)/TCTA:4 wt% Ir(MDQ)2(acac) (4 nm)/TCTA:2 wt% Ir(ppy)3 (4 nm)/43 wt% TCTA: 43 wt% 26DCzPPy: 14 wt% FIrpic (5 nm)/TmPyPb (40 nm)/LiF/Al [1]
Colour	White
Max. EQE	19.4%
Max. Current Efficiency	43.6 cd/A
Max. Power Efficiency	45.8 lm W−1

Device structure	ITO/PEDOT:PSS/TCTA:TPOB:10 wt % FIrpic/TmPyPB/Cs2CO3/Al [2]
Colour	Blue
Max. EQE	13.8%
Max. Current Efficiency	28.2 cd/A
Max. Power Efficiency	22 lm W−1

Device structure	ITO/NPB (40 nm)/TCTA (20 nm)/TPA-C-TPA (30 nm)/TPBi (20 nm)/LiF (1 nm)/Al (200 nm) [3]
Colour	Deep Blue
EQE@10 mA/ cm2	4.83%
Current Efficiency@10 mA/ cm2	3.18 cd/A
Power Efficiency@10 mA/ cm2	2.03 lm W−1

Device structure	ITO/PEDOT:PSS (25 nm)/TCTA:POPH:10 wt% FIrpic (35 nm)/TPBI (35 nm)/Ca (10 nm)/Ag [4]
Colour	Blue
Max. Luminance	40,000 cd/m2
Max. Current Efficiency	25.8 cd/A
Max. Power Efficiency	22.5 lm W−1

Device structure	ITO/PEDOT:PSS(40 nm)/TCTA:TAPC:FIrpic:Ir(ppy)3:Ir(MDQ)2(acac) (40nm)/TmPyPB (50 nm)/LiF (1 nm)/Al [5]
Colour	White
Max. Current Efficiency	37.1 cd/A
Max. Power Efficiency	32.1 lm W−1

Device structure	ITO/MoO3 (3nm)/NPB (20nm)/TCTA (8nm)/TCTA:3P-T2T (1:1): 1.0 wt% DCJTB (15nm)/3P-T2T (45nm)/LiF (1nm)/Al [6]
Colour	Red
MAX. EQE	10.15%
Max. Luminance	22, 767 cd/m2
Max. Current Efficiency	22.7 cd/A
Max. Current Efficiency	21.5 lm W−1

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) [7]
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/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) [8]
Colour	White
Max. EQE	38.4%
Max. Power Efficiency	80.1 lm W−1

Device structure	ITO/EHI608/TCTA/TCTA:3TP:Firpic (1:1:0.17)/3TPYMB/Al [9]
Colour	Blue
Max Power Efficiency	27.5 lm W-1
Max. Current Efficiency	36.0 cd/A

Device structure	ITO/MoOx (5 nm)/NPB (40 nm)/4% Y-Pt*:TCTA (20 nm)/8% FIrpic:mCP(10 nm)/8% FIrpic:UGH2 (10 nm)/BAlq (40 nm)/LiF (0.5 nm)/Al (100 nm) [10]
Colour	White
Max. EQE	16.0%
Max. Current Efficiency	45.6 cd/A
Max. Power Efficiency	35.8 lm W−1

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

Pricing

Grade	Order Code	Quantity	Price
Sublimed (>99.5% purity)	M471	500 mg	£123.00
Unsublimed (>98.0% purity)	M472	1 g	£88.00
Sublimed (>99.5% purity)	M471	1 g	£183.00

MSDS Documentation

TCTA MSDS sheet

Literature and Reviews

1. High-Efficiency Phosphorescent White Organic Light-Emitting Diodes with Stable Emission Spectrum Based on RGB Separately Monochromatic Emission Layers, Q. Zhang et al., Chin. Phys. Lett., 31 (4) 046801 (2014).
2. Enhanced Electron Affinity and Exciton Confinement in ExciplexType Host: Power Efficient Solution-Processed Blue Phosphorescent OLEDs with Low Turn-on Voltage, X. Ban et al., ACS Appl. Mater. Interfaces, 8, 2010-2016 (2016); DOI: 10.1021/acsami.5b10335.
3. Highly efficient emitters of ultra-deep-blue light made from chrysene chromophores, H. Shin et al., J. Mater. Chem. C, 2016, Advance Article; DOI: 10.1039/C5TC03749B.
4. High Power Efficiency Solution-Processed Blue Phosphorescent Organic Light-Emitting Diodes Using Exciplex-Type Host with a Turn-on Voltage Approaching the Theoretical Limit, X. Ban et al., ACS Appl. Mater. Interfaces, 7 (45), 25129–25138 (2015); DOI: 10.1021/acsami.5b06424.
5. Solution-Processed Small Molecules As Mixed Host for Highly Efficient Blue and White Phosphorescent Organic Light-Emitting Diodes, Q Fu. et al., ACS Appl. Mater. Interfaces, 4, 6579−6586 (2012); dx.doi.org/10.1021/am301703a.
6. Highly efficient red OLEDs using DCJTB as the dopant and delayed fluorescent exciplex as the host, B. Zhao et al., Scientific Reports | 5:10697 | DOI: 10.1038/srep10697.
7. 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). 
8. 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.
9. Enhance efficiency of blue and white organic light emitting diodes with mixed host emitting layer using TCTA and 3TPYMB, T-C. Liao et al., Curr. Appl. Phys., 13, S152-S155, (2013).
10. High Efficiency White Organic Light-Emitting Devices Incorporating Yellow Phosphorescent Platinum(II) Complex and Composite Blue Host, S-L. Lai et al., Adv. Funct. Mater., 23, 5168–5176 (2013); DOI: 10.1002/adfm.201300281.

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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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