Synthesis And Characterization Of Red Long Persistent Phosphors Of One-dimensional Y₂O₂S:Eu³⁺,Mg²⁺,Ti⁴⁺via Hydrothermal Method

Recently, the long-lasting nanocrystals have attracted great attention because their high integration has been widely used in photoelectric information, automobile instrument, biochemical and medical devices and so on. Long-lasting nanocrystals can be obtained by many methods. One of the the most commonly used method is hydrothermal method. But traditional hydrothermal method synthesize long-lasting nanomaterials have some defects. We study the1-D Y2O2S:Eu3+, Mg2+,Ti4+prepared by improved hydrothermal process and samples properties in this paper.Nanocrystalline long-lasting phosphor Y2O2S:Eu3+,Mg2+,Ti4+was obtained by traditional hydrothermal method general process are as following as:the first step is that Y(OH)3nanotubes was obtained by hydrothermal method, the second step is that calcinating the precursor with Eu3+、Mg2+、Ti4+ions corresponding to compounds in CS2atmosphere. The disadvantage of this method is that the alkali carbonates and sulfur powder melt during the calcination which then serves as flux and causes the breakdown of the tube-like structure. In this paper, we proposed an effective method to synthesize Y2O2S: Eu3+,Mg2+,Ti4+nanotubes. And then study the influence of sulfuretted temperature, heating rate, soak time and different concentration of dopant on property of samples. The detailed conclusions were summarized:(1) We proposed an effective method to synthesize Y2O2S:Eu3+, Mg2+, Ti4+nanotubes. The Y(OH)3doped with Eu3+, Mg2+and Ti4+ions by hydrothermal method serves as the precursor. The red long-lasting phosphor Y2O2S:Eu3+, Mg2+, Ti4+nanotubes were obtained by means of calcinating the precursor in CS2atmosphere. The suitable temperature for the preparation of Y2O2S:Eu+, Mg2+, Ti4+nanotube is around750℃.(2) with4℃/min.6℃/min.8℃/min and10℃/min up to750℃, the result indicated that the morphology of samples would be best when heating rate is6℃/min, at the same time, luminescence property of samples are best, decay time could last915s(≥1mcd/m2).(3) when temperature rise to750℃, constant temperature time respective are2h、4h、6h and8h, the result indicated that when constant temperature time is6h, sample would have the best luminescence property.(4) The effect of Eu3+doping concentration on the luminescence properties was investigated. Result indicated that when the content of Eu3+dopant was5.0%, the trap depth of sample was0.88eV and the decay time could last for over1175s (≥lmcd/m2) after365nm UV radiation for10min.