| Summary: | Numerous works have been done on finding nanoparticles (NPs) with excellent optical properties. In this work, ruby (chromium doped alumina) nanoparticles have been prepared using femtosecond laser ablation. The synthesized nanoparticles were characterised using dynamic light scattering (DLS), transmission electron microscopy (TEM) and fluorescence microscopy. DLS analysis indicates that the particles size is approximately 52 nm. TEM analysis gives smaller particles size with mean size of 38 nm compared to DLS analysis. Spherical shape of the particles was observed through TEM image. The synthesized NPs showed excellent stability in water with +55 mV zeta potential value. The most efficient wavelengths to excite the ruby NPs were determined as 405 nm and 554 nm. The emission peak for the ruby NPs was at 690 nm which is corresponds to2E-4A2 transition. The synthesized ruby NPs can be applied as a potential bioimaging label © 2018, Malaysian Society of Analytical Sciences. All rights reserved.
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