Europium Oxide Research Articles

Giant valley-polarized spin splittings in magnetized Janus Pt dichalcogenides

We reveal giant proximity-induced magnetism and valley-polarization effects in Janus Pt dichalcogenides (such as SPtSe), when bound to the Europium oxide (EuO) substrate. Using first-principles simulations, it is surprisingly found that the charge redistribution, resulting from proximity with EuO, leads to the formation of two K and K$^{'}$valleys in the conduction bands. Each of these valleys displays its own spin polarization and a specific spin-texture dictated by broken inversion and time-reversal symmetries, and valley-exchange and Rashba splittings as large as hundreds of meV. This provides a platform for exploring novel spin-valley physics in low-dimensional semiconductors, with potential spin transport mechanisms such as spin-orbit torques much more resilient to disorder and temperature effects.

Oxidation of europium with ammonium perfluorocarboxylates in liquid ammonia: pathways to europium(II) carboxylates and hexanuclear europium(III) fluoridocarboxylate complexes.

The novel coordination polymer [Eu(O2CCF3)2(dmf)2]∞ (1) (dmf = N,N-dimethylformamide) containing europium(II) and the two new compounds (NH4)2[Eu6F8(O2CCF3)12(CF3COOH)6] (2) and (NH4)2[Eu6F8(O2CC2F5)12(C2F5COOH)6]·8C2F5COOH (3), both based on hexanuclear europiate(III) complexes, were synthesized from precursors with a Eu2+ : Eu3+ ratio >1, obtained by reaction of europium metal with ammonium perfluorocarboxylates in liquid ammonia. In the crystal structure of 1 the europium(II) ions are bridged by carboxylate groups and N,N-dimethylformamide to form polymeric chains with Eu2+⋯Eu2+ distances of 408.39(13)-410.49(13) pm. The compound crystallizes in the triclinic space group P1̄ (Z = 2). To the best of our knowledge, this is the first example of a (solvated) perfluorocarboxylate containing a lanthanoid in a subvalent oxidation state. In the crystal structures of 2 and 3 the europium(III) ions are bridged by fluoride ions and carboxylate groups to form hexanuclear complex anions with an octahedral arrangement of the cations. The Eu3+⋯Eu3+ distances are in the range of 398.27(15)-400.93(15) pm in 2 and 395.37(4)-399.78(5) pm in 3, respectively. Both compounds crystallize in the monoclinic space group type P21/n (Z = 4) and are the first examples of octahedro-hexanuclear europium carboxylates for which fluoride is reported as a bridging ligand. In all compounds the oxidation state of europium was monitored via151Eu Mössbauer and photoluminescene spectroscopy.

ANALYSIS OF SPECTRAL AND KINETIC CHARACTERISTICS OF CATHODOLUMINESCENCE OF Y2O3:Eu THIN FILMS AS A RED COMPONENT OF FULL-COLOR HIGH-RESOLUTION FLUORESCENT DISPLAYS

The spectra and kinetics of the rising and decay of cathodoluminescence (CL) of thin Y 2 O 3 :Eu films obtained by the method of RF-magnetron sputtering are studied. Based on the shape of the CL spectra at different energies and excitation current densities, the possibility of the formation of irregular solutions of yttrium and europium oxide and the features of the structure of surface and bulk layers are shown. The dependence of the CL intensity on the energy of the exciting electrons and the current density of the electron irradiation has been investigated. The CL decay time constant for the 612 nm luminescence is determined, the value of which is in the range (1.8 – 4.1) ms. It is shown that this quantity is a complex function of the type of film deposition atmosphere, the concentration of the activator, and the duration of the exciting pulses. The features of CL rising are investigated and it is proposed to analyze the structural perfection of Y 2 O 3 :Eu thin films based on the delay in CL rising. Key words : yttrium oxide, cathodoluminescence, thin films.

Synthesis and characterization of silicophosphate glasses doped with europium

In essential sectors such as photonics, luminous diodes, optoelectronics, and lasers, silicophosphate glasses doped with europium are of tremendous interest. In this work, the sol gel method was used to prepare pure and europium-doped silicophosphate glasses. The structural properties of these glasses are examined by XRD and Fourier transforms infrared spectroscopy (FTIR). XRD revealed that all of the prepared glasses contained amorphous phases. FTIR spectroscopy spectra of the samples were recorded in the 500 to 1400 cm−1 spectral range. The structural examinations based on these spectra demonstrate slight decreases in the transmittance bands of the silicophosphate glasses doped with europium, indicating the reduction in the dimensionality of the network because of the breaking of the Si-O-Si bonds into their structure. The findings show that europium oxide has a function in the network that modifies the vitreous matrix structure.

UMA ROTA ALTERNATIVA PARA OBTENÇÃO DE REDES DE COORDENAÇÃO VIA SÍNTESE SOLVOTERMAL UTILIZANDO Eu2O3 E ÁCIDO 2,6-NAFTALENODICARBOXÍLICO

AN ALTERNATIVE ROUTE TO OBTAIN METAL-ORGANIC FRAMEWORKS VIA SOLVOTHERMAL SYNTHESIS USING Eu2O3 AND 2,6-NAPHTHALENODICARBOXYLIC ACID. An alternative route to synthesis of metal-organic frameworks containing Eu(III) ion was proposed via solvothermal process in aqueous medium. The compounds of the minimal formulae [Ln2(NDC)3(H2O)4] were synthesized starting from the mixture of the 2,6-naphthalenedicarboxylic acid with europium(III) oxide. So far, this type of metalorganic framework based on the lanthanide ion synthetic route has not been investigated before as the main metal sources are nitrate and chloride salts. The structural characterizations were performed by FTIR spectroscopy, thermal analysis TG-DSC, and X-ray diffraction. The results of IR and TG were consistent with the structural determination results and complemented by X-ray diffraction patterns. SEM images also corroborate the morphologies found in recent research on this material. The materials obtained shown highintensity luminescence, for the Eu-NDC compound, which corroborates with an energy transfer efficient of the ligand to Eu(III) ion.

Photoluminescence and Crystal Structure of Eu Doped Silicon Oxide Prepared By Hybrid Sputtering and ECR-PECVD

Silicon based light emitters have attracted a considerable interest due to its potential application in emerging technology in the field of solid-state lightening (SSL), solar cells, light emitting diodes (LEDs) and displays. Sharp and well-defined, 4f transition emission of rare earth (RE) elements drive RE doping to be one of the major approaches for enhancing the optical properties of silicon-based materials and it has drawn a significant attention over the last few decades [1]. Cerium (Ce) and terbium (Tb) correspond to blue and green light emission, respectively, and they have been developed to some extent. However, achieving the red-light emission which attributes to the trivalent europium (Eu) oxidation state is more challenging due to the change between the two oxidation states of Eu (Eu2+ and Eu3+) [2].In this work, a set of Eu doped oxygen rich silicon oxide (ORSO) thin films are fabricated using an integrated magnetron sputtering and electron cyclotron resonance plasma enhanced chemical vapor deposition (IMS-ECR-PECVD) system [3]. Following the deposition, the thin films are subjected to annealing using pure nitrogen (N2) and 95% of nitrogen and 5% of hydrogen (N2+H2) atmospheres and different temperatures ranging from 300 to 1350 °C. Performing the photoluminescence (PL) measurements shows that thin films annealed at elevated temperatures (above 1000 °C) exhibit more intense luminescence compared to the ones annealed at lower temperatures (below 900 °C). At annealing temperatures as low as 300 °C, PL intensity at 615 nm which is corresponding to 5D0 to 7F2 transition of trivalent Eu ion is observed. Furthermore, the effect of hydrogen passivation is investigated (as shown in Figure. 1.a) confirming the passivation resulting in an increase of PL intensity by one order of magnitude.Performing Rutherford backscattering spectroscopy (RBS) it is verified the Eu concentration of the thin films vary from 0.17 at. % to 6.36 at. %. It is observed that through IMS-ERC-PECVD system, the concentration of the RE, in this case Eu, can be controlled by manipulating the deposition parameters while the sputtering power shows the most considerable influence. Variable angle spectroscopy ellipsometry (VASE) is conducted to obtain the refractive index and thickness of the thin films. The incorporation of more hydrogen decreases the refractive index whereas the thickness is inversely proportional to hydrogen increase in the deposited film.X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) explain the PL behavior for samples annealed at higher temperatures. The formation of EuxSiyOz crystals approves the intense PL emission of samples annealed at elevated temperatures (above 1000 ºC) particularly at 1350 ºC while for the samples annealed at temperatures below 800 °C, the structure remains amorphous (shown in Figure 1.b).

Toward white light emission from plasmonic-luminescent hybrid nanostructures

Abstract We study the light emission of plasmonic-luminescent hybrid nanostructures consisting of Ag nanoparticles (NPs) embedded in europium oxide (EuOX). The Ag NPs present a bidimensional organization in the nanostructures and they optically behave as oblate spheroids. The photoluminescence (PL) spectral response of the nanostructures evolves from a narrow red emission characteristic of Eu3+ ions in absence of Ag NPs to a broad blue-green emission band associated with Eu2+ ions when the layer of Ag NPs is present. This behavior is not related to a change in the Eu2+/Eu3+ ratio, which is verified by compositional analysis. Instead, a detailed investigation of the PL emission of the nanostructures suggests that the coupling of the Ag NPs to the Eu2+ ions present in the EuOX layer, which manifests itself in an efficient sensitization of these ions, enhances their broad visible emission. In particular, the longitudinal mode of the Ag NPs surface plasmon is considered to be responsible for the efficient energy transfer for the non-normal incidence excitation PL configuration used. Finally, the use of a capping amorphous Al2O3 layer allows improving the robustness of hybrid nanostructures and further enhances their PL emission. These findings provide a new path to actively control the selective excitation of Eu2+ and Eu3+ ions via a controlled coupling with the surface plasmon resonance modes of the Ag NPs and points to these nanostructures as promising building blocks for the development of integrable white light sources.

Catalytic oxidation of lignin and model compounds over nano europium oxide

The heterogeneous catalyst for depolymerization of lignin has a good application prospect because the catalyst is easy to recover. Although heterogeneous noble metal catalysts exhibit excellent activity under mild conditions, high prices restrict their wide use. In recent reports, nano rare earth oxide catalysts have shown good performance in the catalytic oxidation of lignin, and their prices are relatively low, which has good research value. Our study found that rare earth oxide nanocatalysts have obvious structure-activity relationship in the catalytic oxidation of lignin. To investigate theses structure-dependent behaviour and the reaction mechanism, a series of shape-specific Eu2O3 nanocrystal catalysts (spheres, spindles, sheets and rods) with well-defined crystal facets were synthesized and investigated. The four catalysts show increasing conversions from 54.6% to 91.2% in the sequence of nanospindles, nanospheres, nanosheets and nanorods, under condition of 1 MPa O2, 493 K and 8 h. These results demonstrate that the Eu2O3 nanocrystal is structure-sensitive. It is found that the surface crystal facets of Eu2O3 nanocrystals play crucial roles in the catalytic properties. Among the nanocrystals, Eu2O3 nanorods with well-defined (220) crystal facets displayed superior catalytic activity. It is deduced that the high reactivity of Eu2O3 nanorods is related to the abundant lattice oxygen which is benefit to active oxygen species. A plausible reaction pathway that involves the Mars-van Krevelen mechanism was proposed.

Development of a Dy2O3@Eu2O3-carbon nanofiber based electrode for highly sensitive detection of papaverine

A sensitive electrochemical method based on carbon nanofibers (CNFs) and bimetallic nanoparticles of dysprosium oxide (Dy2O3) and europium oxide (Eu2O3) was developed for the determination of papaverine in pharmaceuticals and human urine. Several electrodes were compared in respect to their electrochemically active surface area calculated as 0.0603, 0.1300, 0.3440, 0.3740 and 0.4990 cm2 for bare GCE, CNFs/GCE, Eu2O3-CNFs/GCE, Dy2O3-CNFs/GCE and Dy2O3@Eu2O3-CNFs/GCE, respectively. Electrodes were also compared in respect to their performance towards the voltammetric process of papaverine. The peak potential (Epa) of papaverine was 1.094 V, 0.993 V, 0.978 V, 0.969 V and 0.966 V at unmodified GCE, CNFs/GCE, Eu2O3-CNFs/GCE, Dy2O3-CNFs/GCE and Dy2O3@Eu2O3-CNFs/GCE, respectively. This indicated that the oxidation peak potential of papaverine shifted gradually towards the negative potentials and the peak current increased gradually from unmodified GCE to CNFs/GCE, Eu2O3-CNFs/GCE, Dy2O3-CNFs/GCE and Dy2O3@Eu2O3-CNFs/GCE. The influence of experimental parameters such as scan rate and pH on the voltammetry of papaverine was studied. The Dy2O3@Eu2O3-CNFs/GCE system presented a dynamic working range between 1.0 × 10−7 and 2.0 × 10−6 M with a detection limit of 1.0 × 10−8 M for papaverine. The platform (Dy2O3@Eu2O3-CNFs/GCE) exhibited excellent sensitivity and selectivity for papaverine in the presence of uric acid and was successfully applied for determining papaverine in pharmaceuticals and urine samples.

Sponge-like europium oxide from hollow carbon sphere as a template for an anode material for Reactive Blue 52 electrochemical degradation

The textile industry is one of the major pollutants of waterbodies with effluents high in biochemical and chemical oxygen demand values, high values of total dissolved solids, total suspended solids, and low dissolved oxygen values along with strong color. The existence of a successful method for its decontamination would be beneficial. In this work, we synthesized sponge-like europium oxide (Eu2O3) using a template-directed route from carbon hollow spheres, obtained from glucose as a carbon source. The material synthesis method was done in an aqueous environment, without using any organic solvents. Electrochemical properties of the synthesized material were investigated using cyclic voltammetry and electrical impedance spectroscopy, while morphological characterization was done using scanning electron microscopy and X-ray powder diffraction analysis. Eu2O3 were successfully immobilized at the surface of a screen-printed carbon electrode (Eu2O3/SPCE) using the drop-casting method. Finally, the prepared electrodes were tested toward the removal of Reactive Blue 52 (RB52) using electrochemical advanced oxidation processes (EAOPs). Important parameters, that is, the supporting electrolyte, its concentration, pH value, and the applied voltage, were optimized for RB52 degradation. The rate of removal was monitored spectrophotometrically and by high-performance liquid chromatography with a diode array detector (HPLC-DAD). It was found that the proposed approach reaches complete decolorization of the RB52 solution after a 60-min treatment, at pH 5.6 of KCl supporting electrolyte at a concentration of 0.05 M. Under optimal parameters, after 3 h of treatment, total organic carbon (TOC) was lowered by ~40%. The obtained results indicate that the proposed method may find potential application in EAOPs, considering electrode stability, durability, and efficiency and simplicity of the method.

Lattice Dynamics and Structural Phase Transitions in Eu2O3.

Using the density functional theory, we study the structural and lattice dynamical properties of europium sesquioxide (Eu2O3) in the cubic, trigonal, and monoclinic phases. The obtained lattice parameters and energies of the Raman modes show a good agreement with the available experimental data. The Eu-partial phonon density of states calculated for the cubic structure is compared with the nuclear inelastic scattering data obtained from a 20 nm thick Eu2O3 film deposited on a YSZ substrate. A small shift of the experimental spectrum to higher energies results from a compressive strain induced by the substrate. On the basis of lattice and phonon properties, we analyze the mechanisms of structural transitions between different phases of Eu2O3.

Valence state of europium and samarium in Ln2Hf2O7 (Ln = Eu, Sm) based oxygen ion conductors

Ln2(Hf2-xLnx)O7-x/2 (Ln = Sm, Eu; x = 0.1) pyrochlores have been prepared via mechanical activation of oxide mixtures, followed by heat treatment for 4h at 1450 and 1600 °C, respectively. According to the ESR data, the Eu cations on the Hf site in the Hf1-xEuxO6 octahedra in pyrochlore Eu2(Hf2-xEux)O7-x/2 (x = 0.1) are most readily oxidized and reduced. Oxidation at 840 °C for 24h in air reduces the total conductivity of the Ln2(Hf2-xLnx)O7-x/2 (Ln = Sm, Eu; x = 0.1) by a factor of 2.5–6, due to the decrease in the concentrations of oxygen vacancies and Ln2+ ions as a result of the oxidation. The anomalous low-frequency behavior of the permittivity of the Eu2(Hf2-xEux)O7-x/2 (x = 0.1) at ~800 °C can be understood in terms of the changes in the oxygen sublattice of the pyrochlore structure as a result of the oxidation of divalent europium and partial filling of oxygen vacancies at this temperature.

Rare-Earth Oxides as Alternative High-Energy Photon Protective Fillers in HDPE Composites: Theoretical Aspects.

This work theoretically determined the high-energy photon shielding properties of high-density polyethylene (HDPE) composites containing rare-earth oxides, namely samarium oxide (Sm2O3), europium oxide (Eu2O3), and gadolinium oxide (Gd2O3), for potential use as lead-free X-ray-shielding and gamma-shielding materials using the XCOM software package. The considered properties were the mass attenuation coefficient (µm), linear attenuation coefficient (µ), half value layer (HVL), and lead equivalence (Pbeq) that were investigated at varying photon energies (0.001–5 MeV) and filler contents (0–60 wt.%). The results were in good agreement (less than 2% differences) with other available programs (Phy-X/PSD) and Monte Carlo particle transport simulation code, namely PHITS, which showed that the overall high-energy photon shielding abilities of the composites considerably increased with increasing rare-earth oxide contents but reduced with increasing photon energies. In particular, the Gd2O3/HDPE composites had the highest µm values at photon energies of 0.1, 0.5, and 5 MeV, due to having the highest atomic number (Z). Furthermore, the Pbeq determination of the composites within the X-ray energy ranges indicated that the 10 mm thick samples with filler contents of 40 wt.% and 50 wt.% had Pbeq values greater than the minimum requirements for shielding materials used in general diagnostic X-ray rooms and computerized tomography rooms, which required Pbeq values of at least 1.0 and 1.5 mmPb, respectively. In addition, the comparisons of µm, µ, and HVL among the rare-earth oxide/HDPE composites investigated in this work and other lead-free X-ray shielding composites revealed that the materials developed in this work exhibited comparable X-ray shielding properties in comparison with that of the latter, implying great potential to be used as effective X-ray shielding materials in actual applications.

Temperature sensitive properties and preparation of europium complexes with double ligands

Temperature sensitive paints (TSPs) are a class of rising materials for non-contact temperature measurement technology. Efficient complexes with remarkable luminescent properties play the core role in TSPs. Rare earth organic complexes are often used as probe molecules for TSPs because of their long fluorescence lifetime, narrow fluorescence emission peaks, high fluorescence intensity, and large Stokes shift. Herein, two europium-based complexes, Eu(PCCA)3 phen and Eu (PMCA)3 phen, were synthesized under hydrothermal conditions, using europium(III) oxide (Eu2 O3 ), p-chlorocinnamic acid (PCCA), p-methoxy cinnamic acid (PMCA) and 1,10-phenanthroline (phen) as raw materials. Two temperature sensitive paints (Eu(PCCA)3 phen/PMMA and Eu(PMCA)3 phen/PMMA) were obtained by the polymerization of methyl methacrylate (MMA) with different europium complexes. The structure, morphology, luminescent properties of the europium complexes and temperature quenching properties of the TSPs were characterized by infrared (IR) spectroscopy, scanning electron microscopy (SEM), and fluorescence spectroscopy. The fluorescence results show that both of the two TSPs have good temperature quenching performance in the range 20-100°C with high sensitivity 50-60°C and 80-90°C, respectively. Furthermore, the highest sensitivity of Eu(PCCA)3 phen/PMMA is greater than that of Eu(PMCA)3 phen/PMMA. This work can provide a universal way for preparing efficient TSPs in practical applications.

Ultrasmall Downconverting Nanoparticle for Enhanced Cerenkov Imaging

Cerenkov imaging provides an opportunity to expand the application of approved radiotracers and therapeutic agents by utilizing them for optical approaches, which opens new avenues for nuclear imaging. The dominating Cerenkov radiation is in the UV/blue region, where it is readily absorbed by human tissue, reducing its utility in vivo. To solve this problem, we propose a strategy to shift Cerenkov light to the more penetrative red-light region through the use of a fluorescent down-conversion technique, based upon europium oxide nanoparticles. We synthesized square-shape ultrasmall Eu2O3 nanoparticles, functionalized with polyethylene glycol and chelate-free radiolabeled for intravenous injection into mice to visualize the lymph node and tumor. By adding trimethylamine N-oxide during the synthesis, we significantly increased the brightness of the particle and synthesized the (to-date) smallest radiolabeled europium-based nanoparticle. These features allow for the exploration of Eu2O3 nanoparticles as a preclinical cancer diagnosis platform with multimodal imaging capability.

Unveiling the presence of mixed oxidation states of Europium in Li7+δEuxLa3−δZr2−δO12−δ garnet and its impact on the Li‐ion conductivity

AbstractRecently, lanthanides have been employed by researchers to examine their impact on the structure and properties of Li7La3Zr2O12 (LLZO) garnets. In this regard, we developed Europium oxide (Eu2O3) doped LLZO (Li7+δEuxLa3−δZr2−δO12−δ) solid electrolyte which demonstrates a cubic phase with the symmetry of Iad (No.230) at room temperature. In this investigation, different concentrations of Eu ranging from 0.1 to 0.6 atoms per formula unit (pfu) were doped into Li7La3Zr2O12 to evaluate the impact of Eu on the stability of the cubic phase and thereby the ionic conductivity. The results unveiled that upon doping Eu3+ ions, the Eu2+ state is also formed and is then self‐doped into the structure in which Rietveld refinement coupled with XPS, EPR, and solid‐state NMR suggests that Eu3+ ions most probably partially occupy Zr4+ (16a) site, the Eu2+ ions occupy La3+ (24d) site, and the Li+ ions occupy two different sites (24d and 96h). It was further found that such a site preference induces distortion at LaO8 polyhedrons opening up the neck for Li‐ions diffusion, thereby enhancing the ionic conductivity. Moreover, it was revealed that Li‐ions probably hop from 96h to 24d and then to 96h site to generate the Li‐ion movement. Overall, by introducing Eu ions into the LLZO structure, an enhanced bulk ionic conductivity of 0.30 × 10−3 S/cm at 298 K with a minimum electronic conductivity of 2.547 × 10−9 S/cm at 298 K was achieved.

“Allocation at the point of substitution” applied to recycled rare earth elements: what can we learn?

Partitioning is often recommended as allocation procedure in attributional Life Cycle Assessments (a-LCAs). However, little guidance is available on how to apply partitioning to recycled products. This paper aims to demonstrate and discuss the application of the allocation procedure allocation at the point of substitution (APOS) via an evaluation of the impacts of the recycled phosphor yttrium europium oxide (YOX) from end-of-life fluorescent lamps. Starting from a multifunctional recycling process, APOS is applied by (1) identifying the products of the foreground sub-system, (2) identifying the origin of the recycled waste, (3) defining the boundaries of the production systems, and (4) applying economic allocation. It appears that recycled YOX is accountable for lower impacts than primary YOX for most impact categories. The largest contributor to the impacts of recycled YOX are the impacts related to the primary production of the fluorescent lamp, such as the use of mercury in the lamp tube. Even if this can be counter-intuitive to accept—as these impacts seem unrelated to YOX—these results provide useful information on whether the supply route of rare earth elements (REEs) from end-of-life fluorescent lamps is “future proof,” regarding potential (supply) risks due to environmental impacts upstream in the product supply chain. The application of APOS is demonstrated on the end-of-life recycling of rare earth elements. APOS provides the user of the recycled REE information about environmental impacts upstream in the product’s value chain. This could inform about the sustainability of the company’s operations—i.e., whether the future use or production of a material might be compromised due to (regulations to decrease) environmental impacts.

Activity and self-shielding coefficient Calculations of Europium oxide (Eu2O3) in a hypothetical nuclear reactor

Activity and self-shielding coefficient Calculations of Europium oxide (Eu2O3) in a hypothetical nuclear reactor

Viscosity of the Sodium–Borate Melts Containing Mechanically Activated Samarium, Europium, Erbium, and Thulium Oxides

Viscosity of the Sodium–Borate Melts Containing Mechanically Activated Samarium, Europium, Erbium, and Thulium Oxides

Injectable self-healing anti-inflammatory europium oxide-based dressing with high angiogenesis for improving wound healing and skin regeneration

Lanthanide-based nanomaterials have shown the promising applications in bioimaging and therapy due to their unique optical, magnetic and catalytic properties. However, the effect and promising application of lanthanide-based nanomaterials in wound healing and skin regeneration was rarely reported. Herein, we develop an injectable self-healing anti-inflammatory angiogenic europium oxide nanorods (Eu2O3 NRs) reinforced nanocomposites (FHAE) dressing and demonstrate the important role of Eu2O3 NRs in enhancing wound healing and skin regeneration. The FHAE dressing showed the temperature-sensitive, injectable, and self-healing properties, as well as the excellent cytocompatibility and blood compatibility. The in vivo mouse skin defect model experiments exhibited that FHAE dressing could significantly accelerate the wound healing and promote the skin appendage tissue regeneration through inhibiting inflammatory factors (TNF-α, IL-6) and enhancing the angiogenesis (α-SMA and CD31). This study suggests that Eu2O3-based biomaterials probably have promising applications in tissue engineering and regenerative medicine.