Wavelength tuning from Cadmium based 8-HQ luminous paints formulated with contrasting resins

Abstract

We report the formulation of luminous paints with cadmium-based quinoline complex, bis(8-hydroxyquinoline) (cadmium) - Cdq2 as a pigment (where Cd = Cadmium, q = 8-hydroxy quinoline). Fourier transform infrared (FTIR) spectra, Photoluminescence (PL) spectra and photometric evaluation of the pigment were probed to evaluate its structural, optical and photometric properties. The excitation spectra of Cdq2 pigment Portrays a broad excitation peak at 440 nm while emission spectra reveals a broad peak, registered at 509 nm. Further, fluorescent Paints were formulated on glass sides with five different binders viz. oil (O), water(W), mineral turpentine oil(T), epoxy(E) and urea formaldehyde (UF) based resins and toluene as solvent. The painted panels were tested for various tests to check their resistance against different environments. Most of the water and turpentine-based paint panels failed in some of these tests while oil, epoxy, and urea formaldehyde-based paints passed in almost all the tests; hence further investigations were carried out by excluding water-based and mineral turpentine oil-based paint formulations. Among all the formulations of paint, the intensity of the best five follows the order: Ioil based pure pigment >IUF based pure pigment > IZnO UF (0.05), Ioil based ZnO (0.01) > IZnO Epoxy (0.05). Photometric evaluation reveals that all the painted panels emit light either in the green or bluish-green region of the visible spectrum that lie between 492 to 530 nm. This proffers a way to tune the emission wavelength of the painted panels by wisely adjusting the stoichiometry of either the pigment to binder ratio (p/b) or wt. % of metallic pigments.