Synthesis And Characterization Of Long-Lasting Nano-phosphors With Different Morphology

Long-lasting afterglow materials are also named as phosphorescence materials which have potential applications in safety indicators, fluorescent lamps, urgent illumination system, cathode ray tubes, etc. However, one-dimensional rare-earth nanocrystals have recently attracted great attention because of their widely established applications in fabrication of optical, electronic, biochemical and medical devices. If the rare earth compounds were fabricated in the form of one-dimensional nanostructures, they would have some new properties as a result of both their marked shape-specific and quantum-confinement effects. The main aim of our present work is to synthesize long-lasting nano-phosphors with novel different morphology. The detailed conclusions and results were summarized:(1) Synthesis and characterization of and nanocrystalline Y₂O₂S:Eu³⁺,Mg²⁺,Ti⁴⁺ long-lasting phosphorescent materials via hydrothermal-microwave method. The method used in the experiment is simple and environment-friendly, moreover, the phosphors with narrow size and good distribution illustrate excellent luminescent properties. The effect of the afterglow is good and the color is red.(2) Nanocrystalline Y₂O₂S:Eu³⁺,Mg²⁺,Ti⁴⁺ long-lasting phosphorescent materials were prepared via a new hydrothermal- high-temperature solid-phase method, and the formation mechanism of the product is discussed. The method provides a new approach to synthesize nano-materials with uniform size and good distribution.(3) For the first time to our knowledge, Y₂O₂S:Eu³⁺,Mg²⁺,Ti⁴⁺ nanorods have been prepared by solvothermal method followed by a calcination process in CS₂ atmosphere. Y₂O₂S:Eu³⁺,Mg²⁺,Ti⁴⁺ nanorods with the size of 30⁵0nm show good stability.(4) Y(OH)₃ nanotubes with diameter of 60-80nm were synthesized by hydrothermal synthesis method, and Y₂O₂S:Eu³⁺,Mg²⁺,Ti⁴⁺ nanotubes were obtained after a calcination process in CS2 atmosphere. Y₂O₂S:Eu³⁺,Mg²⁺,Ti⁴⁺ nanotubes maintain the morphology of the precursor, which lay the foundation of surface treatment, assembly and the development of one-dimensional Y₂O₂S:Eu³⁺,Mg²⁺,Ti⁴⁺ phosphors with highly efficient light-emitting in the future.(5) Synthesis of spherical and monodispersed Y(OH)(CO₃):Eu³⁺ nanoparticles via co-precipitation method. Monodispersed Y₂O₂S:Eu³⁺,Mg²⁺,Ti⁴⁺ nanospheres with good distribution and uniform size were obtained after a calcination process in CS₂ atmosphere. The nano-spheres with smooth surface show no obvious agglomeration. The particle size is the 100-150nm, and the phosphor is a red light-emitting material.