Publications by authors named "Ajith Kumar Lakshmanan"
Quaternary chalcogenides have gained significant attention in thermoelectric (TE) material research for their high thermoelectric conversion efficiency. The present work investigates the optimisation of the thermoelectric performance of CuNiSnSe utilising the energy filtering effect through the incorporation of CuO into a host matrix. The impact of varying the weight percentage of CuO on the TE properties of the nanocomposite materials was studied and compared with that of pristine CuNiSnSe.
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- Upconversion nanoparticles (UCNPs) convert low-energy light into high-energy light and are primarily studied for their luminescent properties, with alkali rare-earth fluorides (AREFs) showing high efficiency.
- This research focuses on the AREF upconversion nanoparticle RbYF:Yb, Er, synthesized through a modified thermal decomposition method, revealing that increasing Yb concentration from 20% to 98% results in uniform particle size (~7.9 nm) and orthorhombic structure.
- The upconversion emission studies indicate increased Yb concentration enhances the red-green emission ratio but reduces overall intensity due to concentration quenching, alongside a decrease in decay lifetimes at certain emission lines.