Description
Title: Hydrogen-Bonded Triazine Frameworks with Photophysical and Primary Self-Referencing Thermometric Properties of Europium
Abstract: Recently, a novel, adaptable class of multicomponent luminescent materials known as lanthanide hydrogen-bonded organic frameworks (LnHOFs) has begun to emerge, with applications in optics and photonics showing great promise. Thermal pyrolysis has been successfully used to create polymeric hydrogen-bonded triazine frameworks (PHTF:Eu) that incorporate trivalent europium (Eu3+). The PHTF:Eu material exhibits a porous frame structure with isocyanuric acid as the main constituent and ammelide as a minor component. Using Eu3+, intense red luminescence with high color purity is produced by excitation over a broad absorption band with a peak at 300 nm, which can occur at either room temperature or below. With an intrinsic quantum yield of Eu3+ emission (Eu) as high as 46% and a sensitization efficiency of 42%, the triazine-based host serves as a superb optical antenna towards Eu3+. Comparing PHTF:Eu to conventional inorganic phosphors, temperature-dependent emission studies reveal that PHTF:Eu exhibits relatively high optical stability at high temperatures. The metal-triazine assembly’s intrinsic energy level structure is thought to play a role in thermal quenching mechanisms, possibly through a thermally activated back transfer to ligand triplet or CT states, according to the retrieved activation energy of 89 meV. Finally, we show that PHTF:Eu can function as a universal primary self-referencing thermometer based on a single emitting center with excellent relative sensitivity in the cryogenic temperature range by employing a novel method based on excitation spectra.
Keywords: luminescence; lanthanides; hydrogen bonding; HOFs; thermometry
Paper Quality: SCOPUS / Web of Science Level Research Paper
Subject: Chemistry
Writer Experience: 20+ Years
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