Down shifting luminescent Eu3+ doped Ba6Gd2W3O18 perovskite Nanosensor for Cu2+ ions in drinking water and food samples

Down shifting red luminescent Eu3+ doped Ba6Gd2W3O18 (BGWO: y mol Eu3+; y = 0.00, 0.03, 0.07, 0.10, 0.15) is synthesized for the first time by citrate sol-gel method as a novel fluorescent sensor for Cu2+ in drinking water and food samples. BGWO: y mol Eu3+ is characterized with nano-domain crystalline cubic perovskite structure. PL emission, lifetime measurements and CIE chromaticity coordinates diagram confirmed that BGWO: 0.10 mol Eu3+ has a strong pure red emission color with long lifetime. BGWO: 0.10 mol Eu3+ Nanosensor shows a quite selectivity and sensitivity towards copper ion in comparison to other studied metal ions. Copper sensitivity is studied by BGWO: 0.10 mol Eu3+ Photoluminescence (PL) quenching method. Stern-Volmer plot was achieved over the concentration 0.01 to 100 mu M with correlation coefficient (R-2) of 0.9894 and a detection limit of 0.138 mu M. The sensing mechanism is discussed in detail. Optimized BGWO: 0.10 mol Eu3+ Nanosensor was applied for copper detection in drink water and food sample with high recovery value.

Automated summary

In this study, Eu3+ doped Ba6Gd2W3O18 with nano-domain crystalline structure was successfully synthesized. The material, particularly BGWO: 0.10 mol Eu3+, exhibited strong red emission and long lifetime. It showed high selectivity and sensitivity towards copper ions compared to other metal ions. The sensitivity of copper ions was studied using the photoluminescence (PL) quenching method, and the optimized BGWO: 0.10 mol Eu3+ nanosensor demonstrated high recovery values in the detection of copper in drinking water and food samples.