Page 133 - Synthesis of Functional Nanoparticles Using an Atmospheric Pressure Microplasma Process - LiangLiang Lin

Rare Earth Doped Yttrium Oxide Nanophosphors Synthesis and Engineering- Controllable Photoluminescence Properties
Chapter 7
Rare Earth Doped Yttrium Oxide Nanophosphors Synthesis and Engineering- Controllable Photoluminescence Properties
This chapter is based on:
Lin L, Starostin SA, Li SR, Hessel V, Khan S. Facile Synthesis of Lanthanide Doped Yttria
Nanophosphors by a Simple Microplasma-assisted Process. In preparation.
Lin L, Ma XT, Li S, Wouters M, Hessel V. Plasma-electrochemical Synthesis of Europium Doped
Cerium Oxide Nanoparticles. Submitted to Frontiers of Chemical Science and Engineering.
Abstract
Increasing awareness of the potentially harmful impacts of nanomaterials on human health has led to a high demand for low-toxicity lanthanide (Ln)-doped/co-doped nanophosphors in life science fields. Based on the experimental procedures described in Chapter 6, the present study expands the plasma-assisted technique to the fabrication of a series of lanthanide doped nanophosphors, with Eu3+ doped yttria being a model case for detailed study. Systematic experiments are carried out to synthesize Y2O3:Eu3+ nanophosphors of controllable photoluminescence properties. The plasma-liquid interaction and the obtained products are examined by complementary analytical methods. Results demonstrate that water is exploited as a soft hydrolyzing agent via hydroxyl ions production under plasma treatment. Heat- treatment during annealing step can enhance their luminescent efficiency, while the gradual increase in dopant concentration shows nonmonotonic behavior with an initial positive but a final quenching effect. Moreover, a series of high quality Ln3+ (Ln=Eu, Tb, Dy, Tm) doped/co-doped yttria nanophosphors with tunable photoluminescence properties are prepared to show the versatility of the process.
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