Energy level diagram of ions and ESA upconversion mechanism under excitation at 806 nm.
Temporal evolution of the green upconversion emission at 545 nm under pulsed excitation at 806 nm in a 2.5 mol % of oxyfluoride glass sample.
(a) Upconversion fluorescence spectra obtained at different laser power intensities under excitation at 806 nm in a 2.5 mol % of oxyfluoride glass sample. (b) Upconversion emission spectra at 724 mW of power, before (dashed line) and after irradiation (dotted line) with 2600 mW with the sample at room temperature. Spectrum of a glass ceramic obtained by furnace method under 806 nm excitation is also included for comparison (straight line).
Integrated intensity of the green upconversion emission band. Irradiation power has a threshold value about 2300 mW to create a glass ceramic structure on the irradiated spot.
Emission spectra obtained with different delays after turned on a laser power with 2600 mW at 806 nm.
Dependence of the intensity ratio from the (525 nm) and (545 nm) emission levels to the level vs temperature. The solid line is the fit to Eq. (1).
Sensor sensitivity as function of the temperature in the temperature range of 300–650 K.
(a) SEM image and (b) x-ray microanalyzer mapping of the and ions distribution on the irradiated line.
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