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Product Code M2381B1-250mg
Price $300 ex. VAT

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A TADF yellow emitter, assistant host and photocatalyst

Used as an assistant dopant for highly efficient hyperfluorescent or as solo emitter for TADF devices.

4CzIPN-tBu, 2,4,5,6-tetrakis(3,6-di-tert-butylcarbazol-9-yl)-1,3-dicyanobenzene, a donor-acceptor type molecule composed of dicyanobenzene and tert-butyl-substituted carbazolyl groups around the benzene ring.

4CzIPN-tBu is slightly red-shifted in absorption while comparing to that of 4CzIPN as the eight tert-butyl groups improve the donor strength of the carbazole units thus altering the donor–acceptor interaction. Also, due to the bulkier peripheral tert-butyl groups increasing steric effects, 4CzIPN-tBu experiences weaker intermolecular interactions in the solid-state.

Remarkably, the electrogenerated chemiluminescence (ECL) efficiency of 4CzIPN-tBu in dichloromethane reached almost 40% and stable electrogenerated chemiluminescence was observed from 4CzIPN-tBu due to the fact that polymerization is inhibited by the steric hindrance of the bulky tert-butyl groups at 3,6-postion of the carbazoles.

Solution-processed hyperfluorescent devices with an external quantum efficiency (EQE) of 15.3% using cibalackrot as the fluorescent emitter and 4CzIPN-tBu as the TADF assistant host in CBP. These sterically hindered tert-butyl groups effectively reduced losses caused by triplet diffusion between the TADF assistant host and the fluorescent emitter by spatially separating adjacent molecules and making a concurrent frontier molecular orbital (FMO) less likely [1].

General Information

CAS Number 1630263-99-8
Full Name 2,4,5,6-Tetrakis(3,6-di-tert-butylcarbazol-9-yl)-1,3-dicyanobenzene
Synonyms 4CzIPN-Bu, t4CzIPN, 2,4,5,6-Tetrakis(3,6-di-tert-butyl-9H-carbazol-9-yl)-1,3-benzenedicarbonitrile, 2,4,5,6-Tetrakis(3,6-di-tert-butyl-9H-carbazol-9-yl)isophthalonitrile
Chemical Formula C88H96N6
Molecular Weight 1237.74 g/mol
Absorption* λmax 389 nm in film
Photoluminescence λem 550 nm in film
HOMO/LUMO HOMO = 5.70 eV, LUMO = 3.30 eV [1]
Classification / Family Carbazole derivative, TADF materials, Yellow dopant materials, Sublimed materials

Chemical Structure

4CzIPN-t chemical structure, 1630263-99-8
Chemical Structure of 2,4,5,6-Tetra(3,6-di-tert-butylcarbazol-9-yl)-1,3-dicyanobenzene (4CzIPN-tBu), CAS 1630263-99-8

Product Details

Purity Unsublimed >98.0% (1H NMR)
Melting Point N/A
Appearance Orange powder/crystals

Device Structure(s)

Device Structure ITO (100 nm)/PEDOT:PSS (30 nm)/Cibalackrot:4CzIPN-tBu:mCBP (0.5:29.5:70 mol%, 35 nm)/TPBi (65 nm)/Liq (2 nm)/Al (100 nm) [1]
Colour red light emitting device  Red
Max. Brightness 4595 cd/m2
Max. EQE 15.3%

Device Structure ITO (100 nm)/PEDOT:PSS (30 nm)/4CzIPN-tBu:mCBP (30:70 mol%, 35 nm)/TPBi (65 nm)/Liq (2 nm)/Al (100 nm) [2]
Colour yellow light emitting device  Greenish Yellow
Max. Brightness 15,700 cd/m2
Max. EQE 10.7%

Device Structure ITO (100 nm)/PEDOT:PSS (30 nm)/6,6’-Cibalackrot:4CzIPN-tBu:mCBP (0.5:29.5:70 mol%, 35 nm)/TPBi (65 nm)/Liq (2 nm)/Al (100 nm) [2]
Colour red light emitting device  Red
Max. Brightness 11,920 cd/m2
Max. EQE 10.7% 

Device Structure ITO (100 nm)/PEDOT:PSS (30 nm)/5,5’-Cibalackrot:4CzIPN-tBu:mCBP (0.5:29.5:70 mol%, 35 nm)/TPBi (65 nm)/Liq (2 nm)/Al (100 nm) [2]
Colour red light emitting device  Red
Max. Brightness 12,440 cd/m2
Max. EQE 12.5%


Grade Order Code Quantity Price
Unsublimed (>98.0% purity) M2381 250 mg £240
Unsublimed (>98.0% purity) M2381 500 mg £400
Unsublimed (>98.0% purity) M2381 1 g £640

MSDS Documentation

4CzIPN-tBu4CzIPN-tBu MSDS Sheet

Literature and Reviews

  1. High-performance solution-processed red hyperfluorescent OLEDs based on cibalackrot, N. Wallwork et al., J. Mater. Chem. C, 10, 4767-4774 (2022); DOI: 10.1039/D1TC04937B.
  2. Cibalackrot Dendrimers for Hyperfluorescent Organic Light-Emitting Diodes, N. Wallwork et al., Macromol. Rapid Commun., 43 (16), 2200118 (2022); DOI: 10.1002/marc.202200118.
  3. Photophysical Properties and Efficient, Stable, Electrogenerated Chemiluminescence of Donor–Acceptor Molecules Exhibiting Thermal Spin Upconversion, R. Ishimatsu et al., Chem. Euro. J., 22 (14), 4889-4898 (2016); DOI: 10.1002/chem.201600077.
  4. Photoluminescence Quenching Probes Spin Conversion and Exciton Dynamics in Thermally Activated Delayed Fluorescence Materials, B. Yurash et al., Adv. Mater., 31 (21), 1804490 (2019); DOI: 10.1002/adma.201804490.
  5. Cibalackrot Dendrimers for Hyperfluorescent Organic Light-Emitting Diodes, N. Wallwork et al., Macromol. Rapid Commun., 43 (16), 2200118 (2022); DOI: 10.1002/marc.202200118.
  6. 4CzIPN-tBu-Catalyzed Proton-Coupled Electron Transfer for Photosynthesis of Phosphorylated N-Heteroaromatics, Y. Liu et al., J. Am. Chem. Soc., 143 (2), 964–972 (2021); DOI: 10.1021/jacs.0c11138.

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.

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