Stability of Bi doped La2O3 powder phosphor and PMMA composites
作者： B.M. Jaffar , H.C. Swart , H.A.A. Seed Ahmed , A. Yousif , R.E. Kroon
DOI: 10.1016/J.JPCS.2019.04.004
关键词: Methyl methacrylate 、 Doping 、 Lanthanum oxide 、 Bismuth 、 Desiccator 、 Nuclear chemistry 、 Annealing (metallurgy) 、 Materials science 、 Luminescence 、 Phosphor
摘要: Abstract Bismuth (Bi) ions exhibit interesting optical properties, yet they have been less intensively studied compared to rare earth ions. Blue emitting Bi doped lanthanum oxide (La2O3:Bi) phosphor was synthesized using the sol-gel combustion method at 250 °C citric acid as fuel, followed by annealing 1200 °C in air for 2 h. X-ray diffraction (XRD) data confirmed that powder crystallized a hexagonal lattice, but after storage of several weeks revealed La2O3 had changed La(OH)3. If transformed samples were re-annealed 800 °C 2 h, XRD results showed structure reverted completely and blue PL emission once again observed, however only about one third intensity freshly prepared samples. For stored vacuum desiccator week, no change observed. Degradation effectively slowed, not eliminated, encapsulation poly(methyl methacrylate) polymer.
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