研究目的
The preparation and assembly of novel nanomaterials with suitable functional properties has been the subject of numerous studies. Especially nanoparticles such as rare-earth orthoborates (REBO3, RE = Y, Gd or Lu) and their encapsulated rare-earth ions (Eu3+ and Tb3+) have been extensively explored because of the low toxicity, strong luminescence intensity, high chemical stability, vacuum ultraviolet transparency, and exceptional optical damage threshold.
研究成果
A simple and low-cost route established on the supersonic microwave co-assistance treatment has been developed to assemble LaxY1?xBO3:Eu3+/LayLu1?yBO3:Eu3+ nanosheets in high yields. Based on the variation of lanthanum ions, the achieved luminescent properties can be ef?ciently tuned and the red emission of 5D0–7F2 of Eu3+ was enhanced in contrast to the orange emission of 5D0–7F1. Optimal photoluminescence ef?ciency is obtained at the x = 0.8/y = 0.7.
研究不足
The synthesis techniques require high temperature, high-cost and complicated process. For example, phosphors have been calcined at temperature higher than 1000°C based on the solid state reaction process. In terms of hydrothermal treatment, the reaction mixtures were heated at 240°C for 12 hours.
