Abstract
Alkali metal cations such as Li, Na, K (1mol %) co-doped GdAlO3:Eu3+ (1 mol%) nanophosphors were synthesized by solution combustion technique using oxalyldihydrazide (ODH: C2H6N4O2) as fuel. The structural, morphological, luminescence and antimicrobial activity has been employed to the synthesized nanoparticles. All compounds crystallized in the pure orthorhombic phase with no impurity peak. SEM micrographs showed the agglomerated and irregular shaped particles. The average crystallite size was calculated by William-Hall plots and is found to be in the range 30–40 nm. The characteristic emission peaks of Eu3+ ions were recorded and it is due to 5D0→7FJ (J = 1, 2, 3, 4) transitions. The PL intensity of GdAlO3:Eu3+nano phosphor was improved evidently by alkali metal cation co-doping, due to local distortion of crystal field surrounding the Eu3+ activator. These nanophosphors find potential applications in WLEDs and solid state lighting. Antimicrobial activity of GdAlO3:Eu3+: Li+ nanophosphor against pathogenic microorganisms of both human and plants was carried out by using micro plate dilution technique for bacteria and food poison method for fungi.
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