Pyrene appended terpyridine derivatives as electrochemiluminescence material for OLEDs: Characterization of photo-physical, thermal and electrochemical properties

Vaidya, Jayathirtha Rao ; Busireddy, Manohar Reddy; Rao, Vaidya Jayathirtha; Kotamarthi, Bhanuprakash ; Karunakar, Galla V

Abstract

Three new terpyridine appended pyrene derivatives (Pyr-Tp, Pyr-Ph-Tp, and Pyr-Bp-Tp) have been synthesized by condensation and Suzuki-Miyaura reaction. The photo-physical, electro-chemical and thermal properties of these compounds have been investigated in detail. DFT studies have been carried out to understand the structure-property relationships at the molecular level. Synthesized fluorophores displayed high quantum yield (70-96%) of fluorescence due to triplet to singlet intramolecular energy transfer, delayed fluorescence and positive solvatochromism indicating the presence of intra-molecular charge transfer excited state. In addition, they have high thermal decomposition temperature (Td: 390-450°C), melting temperature (Tm: 180-220°C) and further with suitable oxidation and reduction potentials makes them favourable molecules for OLED fabrications.

 


Keyword(s)

Terpyridine-pyrene derivatives, fluorescence quantum yield, delayed fluorescence, phosphorescence, thermal stability, oxidation and reduction potentials, OLED materials

 


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