4CzIPN-Me

4CzIPN-Me, namely 2,4,5,6-Tetra(3,6-dimethylcarbazol-9-yl)-1,3-dicyanobenzene, is the methyl substituted 4CzIPN at 3,6-positions of the four carbazolyl units. Methyl groups at 3,6-positions will enhance the stability but also the solubility of the Carbazolyl benzonitriles. 4CzIPN-Me is the isomeric structure to 4CzPN-Me and 4CzTPN-Me.

By introducing an assistant dopant having a rather large k_RISC~10⁶, 4CzIPN-Me, both high electroluminescence efficiency and enhanced operational stability could be achieved in TADF assisted fluorescence (TAF-OLEDs). The state-of-the-art TAF-OLED technology uses a TADF molecule as an assistant dopant and a fluorescent molecule as an end emitter in a host matrix. The suppression of exciton annihilation was demonstrated via efficient and rapid triplet- singlet up conversion.

Electrogenerated chemiluminescence (ECL) study shows that the ECL intensity of 4CzIPN-Me decreases during voltage cycles due to the fact that polymerization happens on the carbazolyl moieties.

General Information

Chemical Structure

Product Details

Device Structure(s)

Device Structure	ITO (100 nm)/HAT-CN (10 nm)/TAPC (30 nm)/6.3mol%-4CzIPN-Me:mCBP (30 nm)/T2T (10 nm)/Alq3 (55 nm)/LiF (0.8 nm)/Al (100 nm) [2]
Colour	Greenish Yellow
Max. Current Efficiency	73 cd/A
Max. EQE	21%
LT50@1,000 cd/m2	1472 h

Device Structure	ITO (100 nm)/HAT-CN (10 nm)/TAPC (30 nm)/0.65mol%-TBRb:6.3mol%-4CzIPN-Me:mCBP (30 nm)/T2T (10 nm)/Alq3 (55 nm)/LiF (0.8 nm)/Al (100 nm) [2]
Colour	Orange
Max. Current Efficiency	62 cd/A
Max. EQE	19.1%
LT50@1,000 cd/m2	3775 h

Pricing

MSDS Documentation

4CzIPN-Me MSDS Sheet

Literature and Reviews

1. Efficiency loss processes in hyperfluorescent OLEDs: A kinetic Monte Carlo study, S. Gottardi et al., Appl. Phys. Lett., 114, 073301 (2019); DOI: 10.1063/1.5079642.
2. Dual enhancement of electroluminescence efficiency and operational stability by rapid upconversion of triplet excitons in OLEDs, T. Furukawa et al., Sci Rep., 5, 8429 (2015); DOI: 10.1038/srep08429.
3. High Efficiency in a Solution-Processed Thermally Activated Delayed-Fluorescence Device Using a Delayed-Fluorescence Emitting Material with Improved Solubility, Y. Cho et al., Adv. Mater., 26 (38), 6642-6646 (2014); DOI: 10.1002/adma.201402188.
4. A Novel Sterically Bulky Hole Transporter to Remarkably Improve the Lifetime of Thermally Activated Delayed Fluorescent OLEDs at High Brightness, T. Kamata et al., Chem. Euro. J., 24 (18), 4590-4596 (2017); DOI: 10.1002/chem.201705262.
   
5. Energy transfer processes in hyperfluorescent organic light-emitting diodes, E. Cho et al., J. Mater. Chem. C, 10, 4629-4636 (2022); DOI: 10.1039/D1TC05090G.
   
6. Design of thermally activated delayed fluorescent sensitizers for high efficiency over 20% and long lifetime in yellow fluorescent organic light-emitting diodes, J. Ki met al., J. Mater. Chem. C, 8, 5265-5272 (2020); DOI: 10.1039/D0TC00178C.
7. 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.
   
8. Recent Progress of Singlet-Exciton-Harvesting Fluorescent Organic Light-Emitting Diodes by Energy Transfer Processes. S. Byeon et al., Adv. Mater., 31 (34), 1803714 (2019); DOI: 10.1002/adma.201803714.