In this work, we report on the construction of lanthanide doped CaWO(4) mesoporous structure with efficiently luminescent properties. Using citric acid as the capping agent and SBA-15 as the nanocasting template, lanthanide doped CaWO(4) samples with mesostructure were successfully prepared at low temperature for the first time. The samples were carefully characterized by X-ray diffraction, transmission electron microscopy, N(2) adsorption-desorption, Fourier transform infrared spectroscopy, and luminescence spectra. It is found that the lanthanide doped CaWO(4) showed mesostructure with high specific surface area, large pore volume, and mesoporous pore size distribution. Photoluminescence measurements indicated that lanthanide doped CaWO(4) mesostructure exhibited highly efficient luminescent properties in comparison with conventional randomly deposited lanthanide doped CaWO(4) nanoparticles due to superior interparticle connectivity of mesostructures that can suppress the energy losses and reduce surface quenching centers. By altering lanthanide ions, mesoporous CaWO(4) showed multi-color emission such as green, red, and dark cyan under single-wavelength excitation.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jcis.2012.11.012 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Eu doped CaWO nanophosphor for high sensitivity optical thermometry.
Spectrochim Acta A Mol Biomol Spectrosc
January 2024
Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, PR China. Electronic address:
Eu doped calcium tungstate phosphors were obtained by using sodium citrate as chelating agent in hydrothermal process. The structure and morphology of the samples were indicated by XRD and the FE-SEM. The samples prepared by us are scheelite structure.
View Article and Find Full Text PDFFluorescence and Thermal Regulation Using Low-Supercooling Inorganic Microencapsulated Phase-Change Materials.
ACS Appl Mater Interfaces
April 2023
School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai 201209, P. R. China.
High supercooling and single functionalization are the main barriers to the large-scale application of microencapsulated phase-change materials (PCMs) in the construction industry. To address these issues, we propose a new inorganic microencapsulated PCM, PW@CaWO, which was synthesized via the in situ polymerization method using inorganic CaWO as shell and phase-change paraffin wax (PW) as core. We investigated the effects of different emulsifiers and core-to-shell ratios on microcapsule properties and found that the PW@CaWO microcapsules have regular spherical topography and good uniformity in particle size.
View Article and Find Full Text PDFPhotocatalytic degradation of methylene blue and dye mixture using indium-doped CaWO synthesized by sonochemical and microwave-assisted hydrothermal methods.
Dalton Trans
December 2022
LSQM - Laboratory of Chemical Synthesis of Materials - Department of Materials Engineering, Federal University of Rio Grande do Norte - UFRN, P.O. Box 1524, Natal, RN, Brazil.
This study presents indium-doped calcium tungstate for the first time. The photocatalytic and photoluminescent properties of pure and In doped samples were investigated. All pure and indium-doped calcium tungstate particles were synthesized for 30 minutes by two different methods: the sonochemical method (SM) and the microwave-assisted hydrothermal method.
View Article and Find Full Text PDFThe explanation of abnormal thermal quenching of the charge transfer band based on thermally coupled levels and applications as temperature sensing probes.
Dalton Trans
November 2022
School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing, 400065, P. R. China.
Because of thermal quenching, conventional luminescent materials suffer from severe problems when employed at high temperatures. Based on the thermally coupled energy levels (TCLs) of rare-earth ions, we report and explain an abnormal thermal quenching phenomenon in the excited state of the charge transfer band (CTB), which is expected to bring out a solution to the problems of the low sensitivity of temperature-sensing materials and applications at high temperature. Temperature-dependent excitation spectra of Er or Eu-doped CaMoO, CaWO, and LuVO phosphors are recorded.
View Article and Find Full Text PDFRatiometric thermometry using single Er-doped CaWOphosphors.
Nanotechnology
November 2022
Peter the Great St. Petersburg Polytechnic University, Polytechnicheskaya str. 29, 195251, St. Petersburg, Russia.
Single doped CaWO:Erphosphors were synthesized and studied for application of optical thermal sensing within a wide range of 98-773 K. Ratiometric strategy utilizing two luminescence intensity ratios, one between host and Erband (LIR) and second between different Ertransitions (LIR), results in self-referencing temperature readouts. The presence of two temperature-dependent parameters could improve thermometric characteristics and broaden the working temperature range compared to a usual single-parameter thermometer.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!