Abstract
Neodymium doped LiBaPO4 phosphors were studied as luminescent thermometers for operation within the first biological window (BW I). Thermal sensing by luminescence intensity ratio (LIR) and bandwidth (FWHM and Δλeff) methods were used and their performances were compared. In addition, a new sensing method is proposed based on the width of the emission line, measured at 90% of the maximum intensity (Δλ90%). The obtained results demonstrate that this material can have different sensitivity values, depending on the used methodology, and exhibits one of the highest sensitivity (0.55% K−1) reported for materials doped with neodymium, operating within the BW I, based on a single emission band (4F3/2 → 4I9/2).
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