Study of photophysical properties of different metal complexes of Alq₃.

Different metal complexes of Alq₃ (K(+) , Sr(2+) , Ca(2+) and Mg(2+) ) were synthesized by the precipitation method. The characterization of photoluminescence showed that presence of Mg(2+) ion enhances photoluminescence of Alq₃ phosphor. The emission spectra are observed at 560 nm when excited at a wavelength of 440 nm. The phosphor is excited at a longer wavelength in the blue region of small energy, so that it could be used as lamp phosphor. It is observed that the prepared phosphor AlMgq₅ is more suitable than Alq₃. The ionic radii of K(+) , Sr(2+) , Ca(2+) and Mg(2+) ions are in decreasing order. Therefore, the remarkable properties of AlMgq₅ could be considered as promising materials as opto- or optoelectronic materials.