Lanthanide-doped bismuth-based nanophosphors for ratiometric upconversion optical thermometry.

1,10 However, with the increase of temperature from 318 K to 358 K, its intensity presented an obvious trend of increase, which was due to the thermal enhancement of 2 H 11/2 → 4 I 15/2 transition. 1,10 Similarly, while the temperature increasingly rose from 278 K to 333 K, the emission peak strength centered at 540 nm declined due to the thermal quenching from 4 S 3/2 → 4 I 15/2 transition. 1,10 By contr

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