Spectroscopic Investigation of Up-Conversion Properties in Green Emitting BaMgF 4 :Yb 3+ ,Tb 3+ Phosphor

In this work we have comprehensively studied the up-conversion (UC) properties of BaMgF :Yb ,Tb phosphor for the first time. BaMgF :Yb ,Tb phosphors were prepared by a simple and low cost precipitation method. To determine the influence of dopant concentration on luminescence properties, the corresponding UC luminescence spectra of BaMgF :Yb ,Tb phosphors were studied under NIR excitation. Emission spectra under NIR excitation reveal the vital role of Tb concentration in spectral tuning from the blue to green region. The UC decay curves were also studied to explore the possible energy transfer (ET) mechanisms between Yb and Tb . The results reported here are expected to provide an approach for better understanding ET mechanisms in many Yb /Tb codoped UC phosphors. This study will be helpful in applications where precisely defined optical transitions is an essential criterion.