Highly Sensitive, Multiparametric Thermal History Phosphor Based on An Eu(BTC) Architecture

Abstract

The capacity to discern the highest temperature that an object is subjected to is a crucial diagnostic tool. Consequently, the pursuit of materials that enable the luminescence‐based investigation of the thermal history of an object with high sensitivity is of great importance from the functional applications standpoint. This study aims to present a multiparametric thermal history phosphor based on the luminescent coordination polymer [Eu(BTC)(H2O)6] [Eu(BTC)‐1, where H3BTC = 1,3,5‐benzenetricarboxylic acid]. The progressive dehydration that Eu(BTC)‐1 undergoes as a function of temperature increase in the 343–425 K range results in significant alterations in both the shape of the Eu3+ ions emission spectrum and the depopulation kinetics of their 5D0 level. Based on this occurrence, a thermal history phosphor with an unprecedentedly high relative sensitivity of 11.3% K−1 in ratiometric mode, and 1.8% K−1 in lifetime‐based mode, is developed. The outcomes of this research are expected to stimulate a wide interest in the exploitation of (porous) coordination polymer‐type materials for the development of thermal history phosphors.

Disproportionation Thermochromic Response in a Luminescent Lanthanide Metal–Organic Framework

“…Metal–organic frameworks (MOFs) are crystalline materials assembled from metal ions/clusters and organic ligands, featuring flexible structures, large specific surface area, and high porosity. − As a sub-branch of luminescent MOFs, lanthanide metal–organic frameworks (Ln-MOFs) inherit the structural features of MOFs and also possess excellent optical properties such as sharp emission peaks, high quantum yields, large Stokes shifts, and long luminescence lifetimes. − The abundant 4f–4f transitions of lanthanide ions can generate emissions across the spectrum from the ultraviolet (UV) to the near-infrared region, which can be further tuned via controlling the energy transfer process between the lanthanide ions. , Besides, the luminescence of lanthanide ions in Ln-MOFs is highly susceptible to the coordination environment. , These features inspired us to explore the potential of Ln-MOFs for achieving tunable optical responses to thermal stimuli.…”