Nonradiative Processes in Luminescent Materials: A Materials Scientists View

Engineering of Mixed Eu3+/Tb3+ Metal‐Organic Frameworks Luminescent Thermometers with Tunable Sensitivity

“…Comparing the energy barrier value extracted from the numerical simulations (260 cm −1 for the dominant pathway, Table 4) with those resulting from the Mott-Seitz analysis (∼500-600 cm −1 , Table 2) we notice a factor of ∼2 between them. Although the values are in the same order of magnitude, the discrepancy is supported by i) the assumption that the positions of the energy levels in the MOF were based on those reported by Carnall et al [57] for the Ln 3+ -doped lanthanum trifluoride; ii) the well-known fact that the Mott-Seitz model generally overestimates the energy barrier value; [71] and ii) the fitted ∆ value in Equation 4is an effective energy gap involving the depopulation of the 5 D4 Tb 3+ level by the 5 D1 Eu 3+ one and the depopulation of the 5 D0 Eu 3+ level by the triplet ligand level (explaining the temperature dependence of the 5 D0→ 7 F2 transition).…”