Well scattered strontium hexaferrites (SrFe12O19) nanoparticles have been successfully synthesized by coprecipitation method using polyvinyl alcohol (PVA) as a surfactant and calcinated at 850 °C. With the aim of exploring the magnetic properties of powders obtained, pH values ranging from 8 to 12. The resulting particles were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, Ultraviolet–Visible spectroscopy, thermogravimetric analysis, scanning electron microscopy, dynamic light scattering and vibrating sample magnetometer. In the pH value range 8–12 inclusively, there is sharp rise in the coercivity but an evident decline in both the saturation and remanence magnetization. Fe2O3, as a secondary phase, was discovered to reduce and even disappeared in higher pH value. Single phase strontium hexaferrite plates roughly 40 nm in size were synthesized at pH = 12, and the resulting powders present a coercivity being as high as 4321 Oe and a weak saturation magnetization. Comparing magnetic property of as-obtained nanoparticles synthesized at low pH values, the material combined with higher pH and PVA is in pure phase, which may pave a way for large-scale application.

La(Ni0.75W0.25)O3 perovskite oxide was prepared via the sol–gel Pechini route. The pure crystalline phase was verified via X-ray diffraction measurements and Rietveld structure refinements. Some measurements were applied to characterize the surface of the nanoparticles such as transmission electron microscopy, scanning electron microscope, energy-dispersive X-ray spectroscopy, specific surface area, and X-ray photo-electron spectroscopy measurements. The optical measurement confirmed that this perovskite oxide can absorb the visible light presenting low band energy of 2.41 eV. The d–d allowed transitions in Ni2+-O octahedral have great contributions to the narrow band-gap. The Ni2+-containing perovskite was applied as a photocatalyst showing the desirable photodegradation ability for methylene blue solutions under the excitation of visible-light. The photocatalysis activities were discussed in the relationship with its special perovskite-type structure such as the NiO6 color centers and multivalent cation ions etc.

In this work, we report the preparation of lanthanide (Eu3+, Tb3+)-complex-grafted copolymer of methyl methacrylate and maleic anhydride films. The lanthanide complex with three amino groups was used to react with poly(methyl methacrylate-co-maleic anhydride) (P(MMA-MAH)) via the amidation method. Fourier transform infrared (FT-IR), Transmission electron microscope (TEM), Scanning electron microscope (SEM), Thermogravimetric analysis (TGA) were employed to characterize those polymers. Luminescent properties were evaluated through conducting Photoluminescence (PL) excitation spectra, emission spectra and fluorescence decay curves measurements. The infrared analysis reveals the amidation between amino groups and anhydride rings. The comparatively uniform morphology can be observed in the images of TEM and SEM. These polymers can emit intense characteristic lights including red light from Eu3+ ions and green light from Tb3+ ions under 294 nm excitation. The lifetimes of polymers are short (about 1 ms). Meanwhile, these luminescent polymers exhibit high thermal stability (T5 > 200 °C). We also stimulate a lamp to illustrate the possible application. All these approved interesting results suggest that they hold significant promising applications as luminous layers for optoelectronic devices.

•Two kinds of novel luminescent thin films were prepared for the first time.•The preparation method is simple surface modification.•The films exhibit excellent luminescent performance and thermal stability.•The hydrophilicity of the modified films is increased.Two kinds of novel fluorescent films have been successfully synthesized by surface modification on the poly(ethylene-co-acrylic acid) films using the lanthanide (Eu3+, Tb3+) complexes. The process consists of three steps: conversion of carboxylic acid groups on the surface of the poly(ethylene-co-acrylic acid) films to acid chloride groups, synthesis of the lanthanide complexes bearing amino groups, and amidation to form the modified films. To characterize the modified films, Fourier transform infrared, thermogravimetric analysis, static water contact angle measurements and photoluminescence tests have been employed. Fourier transform infrared verifies the successful preparation of the lanthanide complexes and the modified poly(ethylene-co-acrylic acid) films. These films can emit strong characteristic red and green light under UV light excitation. In addition, the films both have short lifetime (1.14 ms and 1.21 ms), high thermal stability (Td = 408 °C and 411 °C) and, compared with unmodified ones, increased hydrophilicity. All these results suggest that the modified films have potential application as luminescent materials under high temperature.

•A novel polymer-rare earth complex denoted as (PFSi-IPDI)-Tb(Ⅲ)-Phen was synthesized for the first time.•The complexes display excellent luminescent performance and superior thermal stability.•The complexes exhibit outstanding film-forming property and can be made into transparent films.•The complexes can be utilized as excellent luminescence materials under high temperature.The novel luminescent polymer-rare earth complexes, denoted as (PFSi-IPDI)-Tb(Ⅲ)-Phen, have been successfully synthesized and can be made into flexible films. Amino-modified fluorine silicone oil-isophorone diisocyanate (PFSi-IPDI) was used as the host macromolecular ligand, and 1, 10-Phenanthroline (Phen) as the secondary small-molecular co-ligand. The luminescent lanthanide complexes were characterized by fourier transform infrared (FITR), scanning electron microscope (SEM), thermogravimetric analysis (TGA). The luminescent properties were investigated through photoluminescence excitation (PLE) and emission (PL) spectroscopy. FTIR analysis verifies the successful preparation and integration of PFSi-IPDI to Tb3+. The comparatively uniform morphological structure can be observed in the images of SEM. The polymer-rare earth complexes display the typical luminescence emission peaks under the excitation wavelength of 330 nm. From the decay curve, the short lifetime (about 0.89 ms) is observed for (PFSi-IPDI)-Tb(Ⅲ)-Phen (0.6 mol/L). Moreover, these luminescent polymer-rare earth complexes possess superior thermal stability (T5 > 195 °C). All the interesting results suggest the potential application of the luminescent polymer-rare earth complexes in green-emitting luminescent materials under high temperature.

•A novel photocatalyst α-Ni(MoO4) powders was developed by Pechini method.•α-Ni(MoO4) shows high absorption in UV–vis. wavelength region.•α-Ni(MoO4) presents high activity in the MB degradation under visible light.•The structure has specialties: hexagonal tunnel connected by MoO4 and NiO6.α-NiMoO4 powders were prepared by the Pechini method. The sample was investigated by X-ray powder diffraction (XRD) measurement, structural refinement, scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDX). The average size of α-NiMoO4 powders was measured to be 250 nm. The optical absorption spectrum of α-NiMoO4 confirmed an efficient absorption in the UV–visible light wavelength region. The sample presents a narrowed band-gap energy of 2.23 eV, and the effective photocatalytic activity was evaluated by the photodegradation of methylene blue (MB). The effective photocatalytic activity was discussed on the base of the crystal structure characteristics such as heavily distorted NiO6, activated optical centers and good electric conductivity. These results indicate that the hexagonal tunnel-structure alternately connected by MoO4 and the heavily distorted NiO6 is the dominated superiority for high photocatalytic capacity.α-Ni(MoO4) powders show high absorption in UV–vis. wavelength region and high activity in the MB degradation under visible light. This is due to its structural characteristics such as the hexagonal tunnel structure alternately connected by MoO4 and heavily distorted NiO6 octahedra.

•Bi23V4O44.5 nanoplates were prepared by the Pechini method.•It has a narrow band-gap of 2.384 eV from hybridization of Bi-6s and O-2p.•Bi23V4O44.5 has photocatalysis report visible-light-irradiation.•Photocatalysis is due to layered δ-Bi2O3-like structure and codoped V4+/V5+ ions.The work reports the large-scale synthesis and photocatalytic activity of Bi23V4O44.5 nanoplates. The structural refinement was conducted in the layered δ-Bi2O3 based superstructuLre. The detailed surface properties were characterized. Bi23V4O44.5 shows efficient absorption in visible region with a band-gap of 2.384 eV from the hybridization of Bi-6s and O-2p orbitals. Particularly, Bi23V4O44.5 shows an efficient photodegradation for methylene blue (MB). The photocatalysis benefits from the layered B–O structure characteristic and the codoped defects of V4+/V5+ ions in the lattices. Bi23V4O44.5 nanoplates could be a potential photocatalyst.

•SPSA-Tb(III) was prepared by the method of emulsion polymerization.•SPSA-Tb(III) can exhibit excellent Tb(III) characteristic emissions.•SPSA-Tb(III) shows high thermal stability.•SPSA-Tb(III) has short lifetime and high color quality.A green-emitting Tb(III) complex based on siloxane-modified pressure sensitive adhesives (SPSA-Tb(III)) was successfully synthesized by emulsion polymerization. Siloxane-modified pressure sensitive adhesives (SPSA) were used as host materials. The structural coordination, photoluminescence excitation (PLE) and luminescence (PL) spectra, and thermal characterization of this luminescent polymer were investigated. The result from the FT-IR spectra reveals that SPSA have successfully coordinated with the Tb(III) ions. The luminescent analysis indicates that SPSA-Tb(III) displays Tb(III) typical emission peaks at 489, 545, 583, and 622 nm under the excitation of 369 nm. When monitored at 545 nm, strong and sharp excitation bands appear from 300 to 500 nm. And SPSA-Tb(III) has short lifetime (0.25 ms). Meanwhile, SPSA-Tb(III) exhibits high thermal stability (Td = 402 °C) owing to the high bond dissociation energy of SiO bonds. All the results suggest that it is expected to be used as a superior green-emitting material under high temperature.

•The materials were synthesized by the method of emulsion polymerization.•Efficient energy transfer from Tb(III) to Eu(III).•The thermal stability of the materials is excellent.Tb(III), Eu(III) and Tb(III)/Eu(III) activated silicone fluorinated acrylate (SFA) have been successfully synthesized using the method of semi-continuous emulsion polymerization. The copolymers are characterized by flourier transform infrared (FT-IR), thermal gravity analysis (TGA), photoluminescence excitation (PLE) and emission (PL) spectroscopy. The copolymer containing Tb(III) and Eu(III) ions display green and red luminescent colors under UV light excitation, respectively. The TGA curves show the thermal decomposition temperatures of the copolymers are up to about 300 °C. The PL spectra show a strong green emission at 546 nm (5D4 → 7F5) of Tb(III) complexed copolymers, and show a prominent red emission at 615 nm (5D0 → 7F2) of Eu(III) complexed copolymers. Different concentrations of Eu(III) and Tb(III) ions are introduced into the copolymer and the energy transfer from Tb(III) to Eu(III) ions in the copolymer was found. Thus, based on the results it can be suggested that SFA:Eu(III), SFA:Tb(III) and SFA:Tb(III)/Eu(III) can be used potentially as luminescent materials.

•We firstly developed a red-emitting silicon fluoride acrylate-Eu(III) copolymer.•SFA-Eu(III) copolymer can be excited by wavelength in near-UV and blue regions.•Eu3+ ions occupy several disordered crystallographic sites in the copolymer.•SFA-Eu(III) copolymer displays an ideal thermal stability and cold endurance.•SFA-Eu(III) copolymer could be a potential red material to be used for white LEDs.A red-emitting silicon fluoride acrylate (SFA)-Eu(III) copolymer was prepared based on water-in-oil emulsion polymerization method. Its photoluminescence including the temporal decay was studied in addition to the thermal properties. Of the emissions due to the 5D0 → 7FJ (J = 0–4) transitions of Eu3+ ions, an intense red emission due to 5D0 → 7F2 transition was observed at 618 nm under the 395 nm excitation, together with a weak 5D0 → 7F0 emission at 580 nm. Compared with some commercial phosphor, the SFA-Eu(III) copolymer also have a higher QE value. From the optical properties it was suggested that Eu3+ ions were located at the disordered non-inversion Eu3+ sites in the copolymer. The glass transition temperature (Tg) was estimated about −51.5 °C from a differential scanning calorimetric curve, while chemical decomposition was estimated to start from 385 °C from a thermogravimetry analysis curve. Taking into account the thermal stability in a wide temperature range from −51.5 °C to 385 °C, the SFA-Eu(III) copolymer is expected to act as a potential red component for near-UV excited white LEDs.

•The particle size of the latex was around 100 nm with a narrow size distribution.•The latex films were stable at temperature as high as 400 °C.•The water contact angles of cotton and silk fabrics were 125.8° and 120.7°.•When D3F was 20 wt% of the total monomers, the copolymer obtained best property.A novel fluoro-silicone acrylate (FSA) copolymer latex was synthesized with 2-acrylamido-2-methyl-propanesulfonic acid (AMPS), which served as a polymerizable emulsifier by semi-continuous emulsion polymerization. Methyl methacrylate (MMA), butyl acrylate (BA) and 1,3,5-trimethyltris (3,3,3-trifluoropyropyl) cyclotrisiloxane (D3F) were served as co-monomers while vinyltriethoxysilane (VTES) was used as a cross-linking agent. The structure and surface morphologies of the copolymer were characterized by FT-IR, 1H NMR, TEM, TGA and DSC. The influences of AMPS, D3F and VTES on the copolymer's properties of appearance, conversion rate, gel rate and solid content were discussed. The analytical results indicated that the FSA copolymer latex had a narrow particle size distribution around 100 nm with high temperature stability. The copolymer latex shows excellent water repellency with the contact angles of cotton and silk textile of 125.8° and 120.7°, respectively.A semi-continuous emulsion polymerization in the presence of 2-acrylamide-2-methylpro panesulfonic which served as a polymerizable emulsifier was synthesized. The characterizations of the acrylate copolymer emulsion containing fluoro-silicone showed a sound performance.