Multifunctional Platform Based on a Copper(I) Complex and NaYF:Tm,Yb Upconverting Nanoparticles Immobilized into a Polystyrene Matrix: Downshifting and Upconversion Oxygen Sensing.

This work presents an innovative approach to obtain a multifunctional hybrid material operating via combined anti-Stokes (upconversion) and Stokes (downshifting) emissions for oxygen gas sensing and related functionalities. The material is based on a Cu(I) complex exhibiting thermally activated delayed fluorescence emission (TADF) and infrared-to-visible upconverting Tm/Yb-doped NaYF nanoparticles supported in a polystyrene (PS) matrix. Excitation of the hybrid material at 980 nm leads to efficient transfer of Tm emission in the ultraviolet/blue region to the Cu(I) complex and consequently intense green emission (560 nm) of the latter.

Host-guest luminescent materials based on highly emissive species loaded into versatile sol-gel hosts.

Sol-gel chemistry has been extensively employed to produce several classes of materials (e.g. nanoparticles, thin films, fibers, gels, glasses and ceramic powders) with desired easily-controllable morphological, crystallographic and mechanical properties.

The polynuclear complex CuIpy loaded in mesoporous silica: photophysics, theoretical investigation, and highly sensitive oxygen sensing application.

The polynuclear complex CuIpy has been largely studied in solution and in the powder form due to its interesting luminescent properties, which are largely dependent on temperature and pressure. In this work, we present the synthesis of the complex and its wet impregnation in a mesoporous silica host obtained by sol-gel methodology. For optimized loadings, the well-dispersed guest molecules exhibit strong interaction with molecular oxygen, resulting in a significant quenching of the luminescence.