Spectroscopic Investigation and Optical Properties of Eu3+-Doped Fluorophosphate Glasses

Eu3+-doped fluorophosphate (PKACaLF: P2O5 – K2O – Al2O3 – CaF2 – LiF) glasses have been prepared by melt quenching technique. The structural and optical properties have been characterized through Raman, absorption, photoluminescence and decay time measurements. The Judd-Ofelt parameters have been obtained from the absorption spectrum and are found to be Ω2 = 5.21 x10-20 cm2, Ω4 = 8.11 x10-20 cm2 and Ω6 = 1.03 x10-20 cm2. These parameters have been used to calculate the radiative properties of PKACaLFEu10 glass. The relative luminescence intensity ratio of 5D0 → 7F2 to 5D0 → 7F1 transition (R(2/1)) has been evaluated and is found to be 3.25 which indicates moderate asymmetric nature around Eu3+ ions. The luminescence decay of 5D0 level exhibit single exponential nature and the lifetimes (~ 2.50 ms) are found to be almost constant with increasing Eu3+ ion concentration. The chromaticity color coordinates (x = 0.63, y = 0.31) are in the reddish orange region. From these results, it is confirmed that the present PKACaLF glasses are useful for the development of optical display devices.