The Effect of Molecular Structure on the Properties of Fluorene Derivatives for OLED Applications
Anna Pidluzhna,
Aivars Vembris,
Raitis Grzibovskis,
Margarita Anna Zommere,
Oleksandr Bezvikonnyi,
Jurate Simokaitiene,
Melita Baronaite,
Dmytro Volyniuk,
Juozas V. Grazulevicius,
Amjad Ali,
Glib Baryshnikov,
Khrystyna Ivaniuk,
Hryhorii Starykov,
Pavlo Stakhira
Affiliations
Anna Pidluzhna
Institute of Solid State Physics, University of Latvia, Kengaraga Str. 8, LV-1063 Riga, Latvia
Aivars Vembris
Institute of Solid State Physics, University of Latvia, Kengaraga Str. 8, LV-1063 Riga, Latvia
Raitis Grzibovskis
Institute of Solid State Physics, University of Latvia, Kengaraga Str. 8, LV-1063 Riga, Latvia
Margarita Anna Zommere
Institute of Solid State Physics, University of Latvia, Kengaraga Str. 8, LV-1063 Riga, Latvia
Oleksandr Bezvikonnyi
Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko St. 59, LT-51423 Kaunas, Lithuania
Jurate Simokaitiene
Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko St. 59, LT-51423 Kaunas, Lithuania
Melita Baronaite
Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko St. 59, LT-51423 Kaunas, Lithuania
Dmytro Volyniuk
Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko St. 59, LT-51423 Kaunas, Lithuania
Juozas V. Grazulevicius
Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko St. 59, LT-51423 Kaunas, Lithuania
Amjad Ali
Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, SE-60174 Norrköping, Sweden
Glib Baryshnikov
Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, SE-60174 Norrköping, Sweden
Khrystyna Ivaniuk
Department of Electronic Engineering, Institute of Telecommunications, Radioelectronics and Electronic Engineering, Lviv Polytechnic National University, Stepan Bandera 12, 79013 Lviv, Ukraine
Hryhorii Starykov
Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko St. 59, LT-51423 Kaunas, Lithuania
Pavlo Stakhira
Department of Electronic Engineering, Institute of Telecommunications, Radioelectronics and Electronic Engineering, Lviv Polytechnic National University, Stepan Bandera 12, 79013 Lviv, Ukraine
A new family of symmetrical fluorene derivatives with different types of substituents attached to the C-2 and C-7 positions of the fluorene core synthesized by the Sonogashira coupling reactions is reported. The electronic structures and the properties of the compounds investigated by means of photoelectron emission spectroscopy, UV–Vis absorption and photoluminescent spectroscopy as well as by DFT and TD-DFT theoretical calculations are discussed. It is shown that the nature of substituents influences the π-conjugation of the molecules. No intermolecular charge transfer within the investigated wavelength range is observed. The applicability of the synthesized compounds in organic light-emitting diodes (OLEDs) based on exciplex emission is demonstrated. The advanced co-deposition technique with the tuned OLED architecture was applied and resulted in improved OLED parameters.
