Microwave-assisted synthesis to prepare metal-organic framework for luminescence thermometry

Rare-earth UiO-66 for temperature sensing near room temperature

“…As we have highlighted in previous studies, the Eu/Tb molar ratio has an impact on relative thermal sensitivity and the operating temperature range. 6,40 However, here the increase of Eu content leads to a diminution of the relative thermal sensitivity while we obtained an opposite trend in different Eu–Tb coordination polymers. 6,40 That could be explained by the structure of RE-UiO-66, which exhibits RE 6 -clusters with a minimal distance of 11 Å between them, which prevents Tb 3+ -to-Eu 3+ energy transfer between clusters.…”

“…6,40 However, here the increase of Eu content leads to a diminution of the relative thermal sensitivity while we obtained an opposite trend in different Eu–Tb coordination polymers. 6,40 That could be explained by the structure of RE-UiO-66, which exhibits RE 6 -clusters with a minimal distance of 11 Å between them, which prevents Tb 3+ -to-Eu 3+ energy transfer between clusters. Thus, when increasing Eu 3+ content, the probability to obtain a RE 6 -cluster totally composed of Eu 3+ ions is increased and the Tb 3+ -to-Eu 3+ energy transfer is limited.…”