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

doi:10.3390/molecules29204918

The Effect of Molecular Structure on the Properties of Fluorene Derivatives for OLED Applications

Molecules. 2024 Oct 17;29(20):4918. doi: 10.3390/molecules29204918.

Authors

Anna Pidluzhna¹, Aivars Vembris¹, Raitis Grzibovskis¹, Margarita Anna Zommere¹, Oleksandr Bezvikonnyi^{2

3

4}, Jurate Simokaitiene², Melita Baronaite², Dmytro Volyniuk², Juozas V Grazulevicius², Amjad Ali⁵, Glib Baryshnikov^{5

6}, Khrystyna Ivaniuk⁷, Hryhorii Starykov², Pavlo Stakhira⁷

Affiliations

¹ Institute of Solid State Physics, University of Latvia, Kengaraga Str. 8, LV-1063 Riga, Latvia.
² Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko St. 59, LT-51423 Kaunas, Lithuania.
³ Department of Physics, Faculty of Mathematics and Natural Sciences, Kaunas University of Technology, Studentų St. 50, LT-51369 Kaunas, Lithuania.
⁴ KTU "M-Lab" Laboratory Center, Kaunas University of Technology, Studentų St. 63A, LT-51369 Kaunas, Lithuania.
⁵ Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, SE-60174 Norrköping, Sweden.
⁶ Department of Chemistry and Nanomaterials Science, Bohdan Khmelnytsky National University, 18031 Cherkasy, Ukraine.
⁷ Department of Electronic Engineering, Institute of Telecommunications, Radioelectronics and Electronic Engineering, Lviv Polytechnic National University, Stepan Bandera 12, 79013 Lviv, Ukraine.

Abstract

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.

Keywords: OLEDs; blue-emission; electroplex; exciplex; fluorene derivatives.

Abstract

Grants and funding