Manipur University

About: Manipur University is a education organization based out in Imphal, Manipur, India. It is known for research contribution in the topics: Luminescence & Photoluminescence. The organization has 963 authors who have published 1220 publications receiving 11254 citations.

Recent Progress in Biological Activities of Indole and Indole Alkaloids.

Abstract: The indole scaffold is found in a wide range of bioactive heterocycles and natural products. Moreover, the indole moiety is considered as the active principle in several alkaloids such as mitomycin C and reserpine. Thus, over the past decade, chemists are increasingly attracted towards the studies on the pharmacological and therapeutic activities of indole containing compounds. Furthermore, the molecular structures of well-known drugs such as sumatriptan, tadalafil, fluvastatin and rizatriptan are based on indole frameworks. This mini-review covers some of the significant and recent achievements of indole derivatives with respect to their biological activities up to 2015.

Effects of Ce3+ Codoping and Annealing on Phase Transformation and Luminescence of Eu3+-Doped YPO4 Nanorods: D2O Solvent Effect

Abstract: Ce3+- and Eu3+-doped YPO4 nanorods have been prepared at relatively low temperature (120 °C). A detailed investigation of the role of Ce3+ concentration up to 10 atom % on the luminescence intensity of Eu3+ in Ce3+- and Eu3+-doped YPO4 has been carried out. Phase transformation from a tetragonal to a hexagonal structure occurs with increasing Ce3+ concentrations, and water molecules are also associated during phase transformation. Thermal study shows that water can be retained up to 800 °C in the hexagonal structure. Interestingly, the hexagonal structure returns to the tetragonal structure on annealing above 900 °C. As-prepared and 500 °C heated samples show uniform sized nanorods, whereas a 900 °C heated sample shows distorted nanorods in which pores are present. Initially, the luminescence intensity decreases sharply with increasing Ce3+ concentrations, even for 2 atom %. This is related to the enhanced nonradiative rate as compared to the radiative rate, since multiphonon relaxation to surrounding wat...