Optical characterization of toluene-based Schiff base metal complexes for optoelectronic applications
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Optical characterization of toluene-based Schiff base metal complexes for optoelectronic applications N. K. Gondia1 and S. K. Sharma1,* 1
Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India
Received: 30 May 2020
ABSTRACT
Accepted: 22 October 2020
In the present research work, Schiff base ligand was synthesized by the condensation reaction of 3,4-diaminotoluene with salicylaldehyde. Ligand was used for complexation with various metals such as Mn, Fe, Co, Ni, Cu and Zn. Characterization was made by IR, NMR, UV–Vis and fluorescence studies. The structural characterizations were made on the basis of resonance peaks observed in 1HNMR spectra and presence of bands in FTIR spectra. Shifting of peaks in 1 HNMR spectra and functional group positions in the FTIR spectra are discussed in relation with complexation. Optical characterizations were made on the basis of transitions in absorption and emission processes. Out of the metal complexes studied, Zn complex shows maximum fluorescence intensity. The Zn complex in solution form also shows strong glow when exposed to UV lamp. Photometric parameters, quantum yield and HOMO-LUMO gap were estimated in order to see the possible application of Zn complex in display devices.
Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Schiff base ligands have attracted much attention in past decades for its full-colour flat-panel displays [1]. Properties of salicylaldehyde-based Schiff base ligands are similar to conventional material Alq3 used as an electron transport layer material. These ligands possess interesting luminescence properties due to hydroxyl group, imine nitrogen and a delocalized p system. Therefore, salicylaldehyde Zn complex exhibit good luminescence with electron donating groups into the salicylidene moiety of Zn complexes [2]. The metal complexes of these materials have a large number of applications in various display devices. Energy transfer process in metal
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https://doi.org/10.1007/s10854-020-04745-1
complexes helps in increasing the fluorescence emission from complexes. In addition, luminescence properties of these complexes can be easily tuned by changing the substituent in the ligand [3, 4]. In particular, Zn complex attains considerable attention due to its good electron transport as well as emitting properties replacing the use of conventional Alq3 used as electron transporting and emissive layer material. Moreover, Zn complexes are found to be promising candidates for organic display by virtue of their low molecular weight, easy sublimation, good stability, high efficiency, colour tenability and ease of synthesis at low costs [5]. Electron mobility of Zn complexes is high due to the existence of large charge transfer integral and low reorganization energy [6–9].
J Mater Sci: Mater Electron
Also the presence of d10 configuration in Zn results in good emission. Many Schiff base ligands show good coordination wit
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