Effect of Fluorination on the Properties of 9,9′-(Sulfonylbis(4,1-Phenylene))bis(3-(tert-Butyl)-6-Fluoro-9H-Carbazole) as Host for Thermally Activated Delayed Fluorescent Emitters

Nor Shafiq Mohd Jamel, Woon Kai Lin, Muhammad Kumayl AbdWahab, Dmytro Volyniuk, Matas Gužauskas, Azzuliani Supangat, Nurdiana Nordin, FH Abd Nasir, Melika Ghasemi, Kamile Bareikaite, Andrew Monkman, Tan Yee Seng, Goh Bey Hing, Juozas Vidas Grazulevicius

To enhance organic light emitting diode (OLED) performance, host materials with high triplet energies are crucial for confining excitons, despite increasing driving voltages due to the singlet-triplet energy gap. We synthesized sulfonylbis(4,1-phenylene)bis(3,6-disubstituted-9H-carbazole) derivatives as donor-acceptor-donor host materials, namely compounds 3, 5 and 7, with varying fluorination levels. These compounds show moderate singlet-triplet energy splitting and molecular dipole moments, allowing […]