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 using citric acid as the fuel, followed by annealing at 1200 °C in air for 2 h. X-ray diffraction (XRD) data confirmed that the phosphor powder crystallized in a hexagonal lattice, but after storage of several weeks revealed that the La2O3 had changed to La(OH)3. If the transformed samples were re-annealed in air at 800 °C for 2 h, XRD results showed that the structure reverted completely to La2O3 and the blue PL emission was once again observed, however at only about one third of the intensity as for freshly prepared samples. For samples stored in a vacuum desiccator for one week, no change for XRD and PL were observed. Degradation was effectively slowed, but not eliminated, by encapsulation of the phosphor in poly(methyl methacrylate) polymer.
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