期刊
OPTICAL MATERIALS
卷 88, 期 -, 页码 540-550出版社
ELSEVIER
DOI: 10.1016/j.optmat.2018.12.025
关键词
Solution combustion synthesis; La2O3 co-doped nanoparticles; Thermoluminescence; Dosimetry
资金
- National Research Foundation (NRF) of South Africa
- University of South Africa (UNISA)
- College of Science Engineering and Technology (CSET)
- Consejo Nacional de Ciencia y Tecnologia (CONACyT) of Mexico
Stimulated luminescence of novel La2O3 nanophosphors doped with Dy3+ and Eu3+ and co-activated with Li+, prepared by microwave-assisted solution combustion synthesis, was investigated for the very first time. X-ray diffraction results indicated hexagonal La2O3 crystalline phase. Lanthanide and Li+ doping did not affect the La2O3 crystal structure. Scanning electron microscopy images showed nanoparticle morphologies such as plates, rods and irregular shapes. Photoluminescence spectra of La2O3:Dy3+, Li+ exhibited blue and green emission bands due to Dy3+ transitions. For La2O3:Eu3+, Li+, sharp emission lines, corresponding to the optical transitions of Eu3+ were observed. Thermoluminescence glow curve of La2O3:Dy3+, Li+ previously exposed to beta radiation exhibited a prominent glow peak located at similar to 46 degrees C, possibly useful for after-glow or persistent luminescence applications, whereas La2O3:Eu3+, Li+ curve, displayed three intense peaks at similar to 50, similar to 110 and similar to 150 degrees C. Thermoluminescent signal repeatability and decay curve asymptotic behaviour could place La2O3:Eu3+, Li+ as suitable for medium and high-dose radiation dosimetry applications.
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