Temperature sensing performance based on up-conversion luminescence in hydrothermally synthesized Yb3+/Er3+ co-doped NaScF4 phosphors

NaScF₄:Yb³⁺/Er³⁺ crystals were successfully hydrothermally synthesized using distilled water as a single solvent.

Near infrared emission properties of Er doped cubic sesquioxides in the second/third biological windows

In the recent years, there is an extensive effort concentrated towards the development of nanoparticles with near-infrared emission within the so called second or third biological windows induced by excitation outside 800-1000 nm range corresponding to the traditional Nd (800 nm) and Yb (980 nm) sensitizers. Here, we present a first report on the near-infrared (900-1700 nm) emission of significant member of cubic sesquioxides, Er-Lu2O3 nanoparticles, measured under both near-infrared up-conversion and low energy X-ray excitations. The nanoparticle compositions are optimized by varying Er concentration and Li addition. It is found that, under ca. 1500 nm up-conversion excitation, the emission is almost monochromatic (>93%) and centered at 980 nm while over 80% of the X-ray induced emission is concentrated around 1500 nm. The mechanisms responsible for the up-conversion emission of Er - Lu2O3 are identified by help of the up-conversion emission and excitation spectra as well as emission decays considering multiple excitation/emission transitions across visible to near-infrared ranges. Comparison between the emission properties of Er-Lu2O3 and Er-Y2O3 induced by optical and X-ray excitation is also presented. Our results suggest that the further optimized Er-doped cubic sesquioxides represent promising candidates for bioimaging and photovoltaic applications.

CaMoO4 nanosheet arrays for efficient and durable water oxidation electrocatalysis under alkaline conditions

It is highly desirable to design and develop earth-abundant electrocatalysts for efficient and durable oxygen evolution reaction (OER) under alkaline conditions. In this communication, we demonstrate the development of CaMoO4 nanosheet arrays on nickel foam (CaMoO4/NF) as a durable high-performance non-noble-metal electrocatalyst for the OER. CaMoO4/NF shows high catalytic activity and needs an overpotential of only 345 mV to attain a geometrical catalytic current density of 50 mA cm-2 in 1.0 M KOH. Notably, it also shows high long-term electrochemical durability for at least 25 h.

Research progress of Mn doped phosphors

In this review article, Mn applications have been divided into three parts.

Europium-doped NaGd(WO4)2 nanophosphors: synthesis, luminescence and their coating with fluorescein for pH sensing

Uniform nanospheres of Eu : NaGd(WO₄)₂ have been synthesized and further coated with fluorescein to develop a ratiometric pH sensor for biotechnological applications.

Highly efficient NIR to NIR upconversion of ZnMoO4:Tm3+,Yb3+ phosphors and their application in biological imaging of deep tumors

In vivo imaging of deep tumor in nude-mice was successfully demonstrated using highly efficient ZnMoO₄:Tm³⁺,Yb³⁺,K⁺ nano-phosphors and an 810 nm NIR laser.

Y2BaZnO5:Er3+ microcapsules with enhanced upconversion by vanadium ion codoping

Er³⁺/V⁵⁺/Yb³⁺ doped Y₂BaZnO₅ microcapsules of 1–3 μm were prepared by HT route. Bright green to orange UC was observed by dual 800 and 980 nm laser excitation. More than 3 fold intensification of Er UC was achieved by 3 mol% V⁵⁺ substitution.

Energy transfer dynamics and luminescence properties of Eu3+ in CaMoO4 and SrMoO4

Undoped and europium doped CaMoO₄ and SrMoO₄ scheelites are synthesized using a complex polymerization method.

Effect of the Li+ ion on the multimodal emission of a lanthanide doped phosphor

The present study probes the multimodal emission: upconversion, photoluminescence and quantum cutting processes in a Ho³⁺/Yb³⁺ co-doped Y₂O₃ phosphor and further examines the impact of the Li⁺ ion on the multi-modal emission, for the first time.