Figure 4
From: YVO4:Nd3+ nanophosphors as NIR-to-NIR thermal sensors in wide temperature range

(a) Normalized emission spectra of 4F3/2 (R1,2) − 4I9/2 (Z5) transition obtained at different temperatures (123–873 K); (b) FWHM of 4F3/2 (R1,2) − 4I9/2 (Z5) transition as a function of temperature with fit to equation (3).