Effect of Li+ ion sensitization and optical temperature sensing in Gd2O3: Ho3+/Yb3+.

Ho 3+ /Yb 3+ codoped Gd 2 O 3 phosphor has been synthesized by solution combustion method. The concentrations of Ho 3+ and Yb 3+ were optimized to be 0.3 and 2.0 mol% respectively for maximum emission intensity. The effect of Li + ion co-doping on phase structure and photo luminescence were investigated. It is found that there is no change in phase of the sample due to Li + ion co-doping. However the Upconversion (UC) and Downshifting (DS) emission show a remarkable enhancement in intensity. It is concluded that, this enhancement in the emission intensity is mainly due to the change in crystal field around the Ho 3+ ion and reduction in quenching centers. The optimum doping concentration of Li + ion was found to be 20 mol%. We have further explored the temperature sensing behavior using the FIR technique. The maximum sensitivity is found to be 0.0092 K −1 at 505 K. [ABSTRACT FROM AUTHOR]