Shining light on Pr3+-doped Bi4(SiO4)3 phosphors for wide-range high-temperature luminescent thermometers

to 318.19% at 428 K relative to the initial value at 298 K, and in reverse reducing that of the BSO host to 10.54% versus the case at 298 K. Such a rapid changing mode of fluorescent intensity ratio of intra-4f emissions over host emission will strategically develop the desired wide-range high-temperature luminescent thermometers.