Effect of doping concentration and annealing temperature on luminescence properties of Y2O3:Eu3+ nanophosphor prepared by colloidal precipitation method

► Surfactant and catalyst free synthesis of Eu3+ doped Y2O3 nanophosphor showing bright red emission at 612 nm. ► Optimization of reaction conditions and Eu3+dopant concentration to achieve high luminescence efficiency. ► Estimation of crystallite size and size distribution of nanophosphor from XRD data. ► Surface conjugation of Eu3+ doped Y2O3 nanophosphor with dextran biomolecules.