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Transition Metal Complexes of Pyridyl Ligand as Light Emitting Materials in OLEDs

https://doi.org/10.14233/ajchem.2020.22371
Thippeswamy Basavaraja
Department of Chemistry, University College of Science, Tumkur University, Tumkur-572103, India; Department of Chemistry, Government Science College, Chithradurga-577501, India
Somashekara Bhadrachar
Department of Chemistry, Smt. Indira Gandhi Government First Grade Women′s College, Sagar-577401, India
Kittappa M. Mahadevan
Department of Chemistry, Kuvempu University, P.G. Centre, Kadur-577548, India
Giriyapura R. Vijayakumar
Department of Chemistry, University College of Science, Tumkur University, Tumkur-572103, India

Corresponding Author(s) : Giriyapura R. Vijayakumar

vijaykumargr18@gmail.com

Asian Journal of Chemistry, Vol. 32 No. 1 (2020): Vol 32 Issue 1

Abstract

Transition metal complexes, viz., tetrapyridylbis(isothiocyanato)nickel(II) (1), dipyridylbis(isothiocyanato)copper(II) (2) and dipyridylbis-(isothiocyanato)zinc(II) (3) were synthesized by conventional methods. All the synthesized metal complexes were characterized by spectral and elemental analysis. Diffused reflectance (DR) spectra of the complexes 1-3 recorded in the range 200-1100 nm exhibit major peaks at 450 nm and 750 nm (% diffused reflectance 50 and 55, respectively) for complex 1, 500 nm (20 % diffused reflectance) for complex 2 and 400 nm (50 % diffused reflectance) for complex 3. The excitation and emission peaks obtained from photoluminescence spectra indicated the emission of white, green and white lights by the complexes 1, 2 and 3, respectively. From diffused reflectance spectra, the measured band gap energies were found to be 3.95 eV for complex 1, 2.77 eV for complex 2 and 4.3 eV for complex 3. Commission Internationale de l'Eclairage (CIE) coordinates of (0.31533, 0.33082), (0.22605, 0.35099) and (0.28633, 0.31012) were calculated for the complexes 1, 2 and 3, respectively. The phosphors 1-3 were readily soluble in various common organic solvents and they could become promising light emitting materials in organic light emitting diodes (OLEDs).

Keywords

Transition metal complex Pyridyl ligand Charge transfer Light emitting materials OLED
Basavaraja, T., Bhadrachar, S., Mahadevan, K. M., & Vijayakumar, G. R. (2019). Transition Metal Complexes of Pyridyl Ligand as Light Emitting Materials in OLEDs. Asian Journal of Chemistry, 32(1), 161–166. https://doi.org/10.14233/ajchem.2020.22371
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