Engineering of Mixed Eu ³⁺ /Tb ³⁺ Metal‐Organic Frameworks Luminescent Thermometers with Tunable Sensitivity

In the last decade, numerous Ln-bearing metal-organic frameworks (MOFs) have been reported for luminescence thermometry applications. Although Ln3+ composition is always thoroughly determined, this parameter never optimized to improve thermometric performances. Here, optimization of performances luminescent probes tackled by reporting a series mixed Eu3+–Tb3+ frameworks. The are accessed as function Eu3+ content yielding maximum relative sensitivity between 0.19 and 0.44% K−1 registered at temperatures 340 240 K, respectively. A meticulous theoretical investigation Tb3+-to-Eu3+ energy transfer in MOFs also performed determine predominant pathway transfer. For first time, clear evidence significant influence Eu/Tb ratio on emitting centers presented that definitively determines operating temperature range thermal probes.