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Please use this identifier to cite or link to this item: http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/14599
Title: Spectral characterizations and photophysical properties of one-step synthesized blue fluorescent 4′-aryl substituted 2,2′:6′,2′′-terpyridine for OLEDs application
Authors: Nair, Sindhu S.
Keywords: Physics
2,2′:6′,2′′- Terpyridine
Photophysical Properties
Photoluminescence
Fluorescent OLED
Fluorescence lifetime
Issue Date: Dec-2015
Publisher: Elsevier
Abstract: We have synthesized a series of 4′-aryl substituted 2,2′:6′,2′′-terpyridine (terpy) derivatives, namely 4′-(4-methylphenyl)-2,2′:6′,2′′-terpyridine (C-1), 4′-(2-furyl)-2,2′:6′2′′-terpyridine (C-2), and 4′-(3,4,5-trimethoxyphenyl)-2,2′:6′,2′′-terpyridine (C-3). The synthesized terpy compounds were characterized by elemental analyses, FTIR, NMR (1H and 13C), and ESI-Mass spectrometry. Photophysical, electrochemical and thermal properties of terpy compounds were systematically studied. Maximum excitation band was observed between 240 and 330 nm using UV–visible spectra, and maximum emission peaks from PL spectra were observed at 385, 405 and 440 nm for C-1, C-2 and C-3 respectively. Fluorescence lifetime (τ) of the fluorophores was found to be 0.35 and 1.55 ns at the excitation wavelength of 406 nm for C-1 and C-2 respectively, and τ value for C-3 was found to be 0.29 ns at the excitation wavelength of 468 nm. We noticed that the calculated values of HOMO energy levels were increased from 5.96 (C-1) to 6.08 (C-3) eV, which confirms that C-3 derivative is more electrons donating in nature. The calculated electrochemical band gaps were 2.95, 2.82 and 3.02 eV for C-1, C-2 and C-3 respectively. These blue fluorescent emitter derivatives can be used as an electron transport and electroluminescent material to design the blue fluorescent organic light emitting diode (OLED) applications.
URI: https://www.sciencedirect.com/science/article/pii/S0022231315004366
http://dspace.bits-pilani.ac.in:8080/jspui/xmlui/handle/123456789/14599
Appears in Collections:Department of Physics

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