Abstract
We report on the synthesis of Nanophosphors of Zinc sulphide using a novel capping agent, ‘chitosan’. Water based wet chemical reactions to obtain stable colloids have been done that does not involve any organic solvents. The resultant nanoparticles approximately 30 nm in size, consisting of 3-5 nm crystallites, show a marked improvement in PL compared to other capping agents generally used to passivate the unsaturated defects on the nanoparticle surfaces, showing orange-red color (590 nm) of luminescence even in broad daylight when illuminated with a low power UV source. The high luminescence efficiency renders these nanophosphors ideal for applications in FEDs and quantum cryptography. The presence of biocompatible capping agent, chitosan, makes it a suitable for bio-labels (markers).
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