Temperature sensing with Er3+:Y2O3 nanoparticles operating within the 1st and 2nd biological window скачать в хорошем качестве

Temperature sensing with Er3+:Y2O3 nanoparticles operating within the 1st and 2nd biological window

Márcio A. R. C. Alencar, DF - UFS Seminário do grupo de óptica - DF - UFPE (31/05/2022) Resumo: The luminescent properties of three nanocrystalline samples of Y2O3:Er3+ produced via PVA-assisted sol-gel route, with mean particle diameter of 21, 44 and 86 nm, were investigated. Luminescence spectra were analyzed using three different wavelengths (532 nm, 660 nm and 800 nm) as excitation sources. The three samples exhibited up to four emission bands centered at 660 nm, 800 nm, 860 nm and 1000 nm, which were related to the 4F9/2→4I15/2, 4I9/2→4I15/2, 4S3/2→4I13/2 and 4I11/2→4I15/2 transitions of Er3+, respectively. Three luminescence intensity ratio (LIR) schemes associated with thermally decoupled levels were proposed and their dependence on ambient temperature was investigated, two for excitation at 660 nm and one for excitation at 800 nm. In all the three cases, excitation and emission wavelengths were within the first or second biological window. Relative sensitivities of up to 2.02 ± 0.06% K − 1 were obtained, which are amongst the highest values for rare-earth doped materials based sensors operating entirely within the biological windows.