Eu3+ doped Gd2Ti2O7 nanoparticles as a luminescence thermometry probes

ABSTRACT: In this report, we analyzed the potential of Eu³⁺ doped Gd₂Ti₂O₇ nanopowders for the luminescence thermometry. Gd₂Ti₂O₇ powders doped with 5 at% Eu³⁺ ions were prepared using Pechini-type polymerized complex route. Sample was investigated for luminescent thermometry over the temperature ranges from 303 - 423 K with fluorescence intensity ratio (FIR) method. Luminescent spectra recorded in range from 400 - 650 nm discovered two distinct spectral regions: the high-energy region associated with the trap emission of the Gd₂Ti₂O₇ host and the low-energy region with well-resolved emission peaks of the Eu³⁺ ions. FIR is determined using trap emission from host and one emission band from Eu³⁺ ion in Gd₂Ti₂O₇. The relative sensitivity varies over the 303-423 K temperature range, and has maximum value of 0.558 % K^-1 at 303 K.