α-NaYb(Mn)F4:Er(3+)/Tm(3+)@NaYF4 UCNPs as "Band-Shape" Luminescent Nanothermometers over a Wide Temperature Range.

α-NaYb(Mn)F4:Er(3+)/Tm(3+)@NaYF4 UCNPs as "Band-Shape" Luminescent Nanothermometers over a Wide Temperature Range.