FREE shipping to on qualifying orders when you spend or more, processed by Ossila BV. All prices ex. VAT. Qualifying orders ship free worldwide! Fast, secure, and backed by the Ossila guarantee. It looks like you are visiting from , click to shop in or change country. Orders to the EU are processed by our EU subsidiary.

It looks like you are using an unsupported browser. You can still place orders by emailing us on info@ossila.com, but you may experience issues browsing our website. Please consider upgrading to a modern browser for better security and an improved browsing experience.


Product Code M2221B1-250mg
Price $275 ex. VAT

Quality assured

Expert support

Volume discounts

Worldwide shipping

Fast and secure


A highly efficient TADF green emitter

As an alternative choice to 4CzIP and 4CzTPN TADF green emitters in TADF-OLED devices.


4CzPN is one of three isomers (including 4CzTPN and 4CzIPN) which belong to the carbazolyl benzonitriles (CBC) family. CBC family members are well known, highly efficient thermally activated delayed fluorescence (TADF) materials.

The carbazolyl groups are located next and opposite to the nitrile groups, electrons in 4CzPN orbitals are supposedly more delocalized than its isomers. However, with four bulky carbazolyl groups next to each other, the steric hindrance can reduce the conjugation of the carbazolyl groups to the centre benzene ring.

General Information

CAS Number 1416881-51-0
Full Name 3,4,5,6-tetrakis(carbazol-9-yl)-1,2-dicyanobenzene
Synonyms 1,2,3,4-tetrakis(carbazol-9-yl)-5,6-dicyanobenzene
Chemical Formula C56H32N6
Molecular Weight 788.27 g/mol
Absorption λmax 315, 325, 364 nm in toluene
Fluorescence λem 528 nm in toluene
HOMO/LUMO HOMO = 5.83 eV, LUMO = 3.38 eV; T1=2.50 eV [1]
Classification / Family Carbazole, TADF materials, Green dopant materials, Sublimed materials

Chemical Structure

4czpn chemical structure, 1416881-51-0
Chemical Structure of 3,4,5,6-tetrakis(carbazol-9-yl)-1,2-dicyanobenzene (4CzPN), CAS 1416881-51-0

Product Details

Purity Unsublimed >98.0% (HPLC), Sublimed >99% (HPLC)
Melting Point >360 °C (lit.)
Appearance Orange powder/crystals

Device Structure(s)

Device Structure ITO/MoO3 (8 nm)/TAPC (60 nm)/TCTA (5 nm)/FIrpic (0.5 nm)/SPA-TXO2* : 4CzPN(25 nm)/TPBi (60 nm)/LiF (0.5 nm)/Al (100 nm) [1]
Colour green  Green
Max. Current Efficiency 43.5 cd/A
Max. EQE 13.1%
Max. Power Efficiency 42.6 Im/W

Device Structure ITO/MoO3 (8 nm)/TAPC (60 nm)/TCTA (5 nm)/FIrpic (0.5 nm)/o-CzTHZ* : 4CzPN(25 nm)/TPBi (60 nm)/LiF (0.5 nm)/Al (100 nm) [1]
Colour green  Green
Max. Current Efficiency 61.1 cd/A
Max. EQE 17.9%
Max. Power Efficiency 50.5 Im/W

Device Structure   ITO/HATCN (10 nm)/Tris-PCz (35 nm)/10 wt.% 4CzPN:mCBP (G-EML) (3 nm)/6 wt.% 4CzPN:2 wt.% 4CzTPN-Ph:mCBP (R-EML) (2 nm)/10 wt.% 3CzTRZ:PPT (B-EML) (10 nm)/PPT (50 nm)/LiF (0.8 nm)/Al (100 nm) [2]
Colour white  White
Max. Power Efficiency 30.3 lm W1
Max. Current Efficiency 38.6 cd/A
Max. EQE 17.6%

Device Structure ITO/HATCN (10 nm)/Tris-PCz (35 nm)/10 wt.% 4CzPN:mCBP (G-EML) (5 nm)/6 wt.% 4CzPN:2 wt.% 4CzTPN-Ph:mCBP (R-EML) (4 nm)/10 wt.% 3CzTRZ:PPT (B-EML) (6 nm)/PPT (50 nm)/LiF (0.8 nm)/Al (100 nm) [2]
Colour white  White
Max. Power Efficiency 34.1 lm W1
Max. Current Efficiency 45.6 cd/A
Max. EQE 17.0%

Device Structure ITO (95 nm)/HATCN (10 nm)/ TAPC (45 nm)/TCTA (5 nm)/0.4 wt% TBRb: 6 wt% 4CzPN (8 nm)/0.8 wt% TBRb: 10 wt% 4CzPN: mCBP (4 nm)/40 wt% Bepp2: mCBP (5 nm)/Bepp2 (3 nm)/5 wt% DSA-Ph*: MADN (8 nm)/TmPyPB (50 nm)/LiF (1 nm)/Al (100 nm) [3]
Colour white  White
Max Current Efficiency 48.9 cd/A 
Max EQE 15.1%
Max. Power Efficiency 47.4 lm W-1

Device Structure ITO (95 nm)/ HATCN (10 nm)/ NPB (40 nm)/ TCTA (10 nm)/ 0.8 wt.% TBRb: 10wt.% 4CzPN: mCBP (12 nm)/ 30 wt.% Bepp2: mCBP (5 nm)/ Bepp2 (3 nm)/ 5 wt.% DPAVBi:MADN (8 nm)/ Bepp2 (50 nm)/ LiF (1 nm)/ Al (100 nm) [3]
Colour white  White
Max. Power Efficiency 37.6 lm W1
Max. Current Efficiency 38.1 cd/A
Max. EQE 11.9%

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

Pricing

Grade Order Code Quantity Price
Unsublimed (>98.0% purity) M2221B1 250 mg £220
Unsublimed (>98.0% purity) M2221B1 500 mg £360
Unsublimed (>98.0% purity) M2221B1 1 g £580
Sublimed (>98.0% purity) M2221A1 250 mg £370
Sublimed (>98.0% purity) M2221A1 500 mg £620
Sublimed (>98.0% purity) M2221A1 1 g £1050

MSDS Documentation

4CzPN4CzPN MSDS Sheet

Literature and Reviews

  1. A new way towards high-efficiency thermally activated delayed fluorescence devices via external heavy-atom effect, W. Zhang et al., Sci. Rep., 6, 30178 (2016); doi: 10.1038/srep30178.
  2. High-efficiency white organic light-emitting diodes using thermally activated delayed fluorescence, J. Nishide et al., Appl. Phys. Lett. 104, 233304 (2014); doi: 10.1063/1.4882456.
  3. Exciton-Adjustable Interlayers for High Efficiency, Low Efficiency Roll-Off, and Lifetime Improved Warm White Organic Light-Emitting Diodes (WOLEDs) Based on a Delayed Fluorescence Assistant Host, Z. Wang et al., Adv. Funct. Mater., 28, 1706922 (2018); DOI: 10.1002/adfm.201706922.
  4. The Effect of Carrier Transport Layer on the Electroluminescent Properties of Solution-Processed Thermally Activated Delayed Fluorescent Device based on 4CzPN, L. Zhang et al., Phys. Status Solidi B, 259 (10), 2200072 (2022); DOI: 10.1002/pssb.202200072.
  5. Interplay between Singlet and Triplet Excited States in Interface Exciplex OLEDs with Fluorescence, Phosphorescence, and TADF Emitters, Z. Zhou et al., Adv. Funct. Mater., 2211059 (2022); DOI: 10.1002/adfm.202211059.

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.

Return to the top