Understanding the thermometric behaviour of LiLuF₄:Tm³⁺,Yb³.

ABSTRACT: The Er³⁺, Yb³⁺ upconversion couple, with its background-free green emission arising from the two thermally coupled ²H_11/2 and ⁴S_3/2 levels of Er³⁺, is a classic "workhorse" example of luminescent Boltzmann thermometry. In contrast, the Tm³⁺, Yb³⁺ couple remains far less established. The Tm³⁺, Yb³⁺ system offers an intense ³H₄ → ³H₆ electronic transition (800 nm) as a possible reference emission for UC thermometry in the NIR-I window. However, the Tm³⁺, Yb³⁺ thermometry system has not yet been fully understood, limiting its potential application in medical and biological contexts, as well as in nanoelectron

SUBMITTER: Lederer M 

PROVIDER: S-EPMC12516696 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature