4TCzBN

4TCzBN, used in white and blue highly efficient TADF-OLED devices

High-purity (>99.0%) and available online for priority dispatch

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4TCzBN is yet another family members of carbazolyl benzonitrile derivatives which are widely used in either white or blue highly efficient TADF-OLED devices.

The carbazolyl groups are electron donating and nitrile group is electron with-drawing while the extended tert-butyl units can serve as an encapsulation shell to the luminophore in 4TCzBN. It is believed that the introduction of the tert-butyl units can effectively separate molecules thus reduce the chance of triplet-polaron annihilation (TPA) to greatly improve the device efficiency and stability.

General Information

CAS number	2055722-93-3
Full name	2,3,5,6-Tetrakis(3,6-di-tert-butyl-9H-carbazol-9-yl)benzonitrile
Synonyms	2,3,5,6-Tetrakis[3,6-bis(1,1-dimethylethyl)-9H-carbazol-9-yl]benzonitrile
Chemical formula	C87H97N5
Molecular weight	1212.73 g/mol
Absorption	λmax 295 nm, 345 nm and 417 nm in toluene
Fluorescence	λem 483 nm in toluene
HOMO/LUMO	HOMO = 5.48 eV, LUMO = 2.73 eV, T1 = 2.60 eV [1]
Classification / Family	Carbazole, Phthalonitrile, TADF materials, Blu dopant materials, Sublimed materials

Product Details

Purity	Sublimed >99.0% (1H NMR)
Melting point	Tg =  322 °C (lit.)
Appearance	Yellow powder/crystals

*Sublimation is a technique used to obtain ultra pure-grade chemicals. For more details about sublimation, please refer to the Sublimed Materials.

Chemical Structure

Device Structure(s)

Device structure	ITO/HATCN (5 nm)/NPB (30 nm)/TCTA (10 nm)/mCP (10 nm)/4TCzBN:2,4-2CzBN* (30 nm)/DPEPO (10 nm)/Bphen (30 nm)/LiF (0.5 nm)/Al (150 nm) [1]
Colour	Sky-blue
Max. EQE	21.5%
Max. Power Efficiency	42.0 Im/W

Device structure	ITO/HATCN (5 nm)/NPB (30 nm)/TCTA (10 nm)/mCP (10 nm)/4TCzBN:3,5-2CzBN* (30 nm)/DPEPO (10 nm)/Bphen (30 nm)/LiF (0.5 nm)/Al (150 nm) [1]
Colour	Sky-blue
Max. EQE	20.1%
Max. Power Efficiency	34.5 Im/W

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

MSDS Documentation

4TCzBN MSDS sheet

Pricing

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Grade	Order Code	Quantity	Price
Sublimed (>99.0% purity)	M2218A1	250 mg	£420
Sublimed (>99.0% purity)	M2218A1	500 mg	£700
Sublimed (>99.0% purity)	M2218A1	1 g	£1150

Literature and Reviews

1. Highly efficient blue thermally activated delayed fluorescent OLEDs with record-low driving voltages utilizing high triplet energy hosts with small singlet–triplet splittings, D. Zhang et al., Chem. Sci., 7, 3355 (2016); DOI: 10.1039/c5sc04755b.
2. Modulation of Förster and Dexter Interactions in Single-Emissive-Layer All-Fluorescent WOLEDs for Improved Efficiency and Extended Lifetime, P. Wei et al., Adv. Funct. Mater., 2019; DOI: 10.1002/adfm.201907083.
3. Highly efficient and stable blue thermally activated delayed fluorescence emitters, D. Zhang et al., SPIE (2016); DIO: 10.1117/2.1201611.006797.

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To the best of our knowledge the information provided here is accurate. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only.