Open AccessTransition Metal Complexes of Pyridyl Ligand as Light Emitting Materials in OLEDs
Author(s) -
Thippeswamy Basavaraja,
Somashekara Bhadrachar,
Kittappa M. Mahadevan
Publication year - 2019
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2020.22371
Subject(s) - chemistry , oled , photoluminescence , transition metal , reflectivity , nickel , spectral line , metal , copper , phosphor , ligand (biochemistry) , diffuse reflection , zinc , chromaticity , analytical chemistry (journal) , photochemistry , optics , materials science , optoelectronics , physics , receptor , biochemistry , organic chemistry , layer (electronics) , astronomy , catalysis , chromatography
Transition metal complexes, viz., tetrapyridylbis(isothiocyanato)nickel(II) (1), dipyridylbis (isothiocyanato)copper(II) (2) and dipyridylbis-(isothiocyanato)zinc(II) (3) weresynthesized 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 werefound 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).