Synthesis and characterization of Y₂O₂S:Eu³⁺, Mg²⁺, Ti⁴⁺ nanotubes via hydrothermal method

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• 作者：Cai鈥瞖 Cui ; Guowei Jiang ; Ping Huang ; Lei Wang ; Dan Liu
• 关键词：Red long-lasting phosphor ; Y2O2S ; Eu3+ ; Mg2+ ; Ti4+ ; Nanotubes ; Luminescence
• 刊名：Journal of Luminescence
• 出版年：January, 2014
• 年：2014
• 卷：145
• 期：Complete
• 页码：665-668
• 全文大小：1050 K

文摘

We reported an effective method to synthesize Y₂O₂S:Eu³⁺, Mg²⁺, Ti⁴⁺ nanotubes. The Y(OH)₃ doped 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 CS₂ atmosphere. The samples were examined using X-ray diffraction (XRD), scanning electron microscope (SEM), photoluminescence (PL) and illuminometer. The results of XRD revealed that the phase of sample was Y₂O₂S when the sulfuretted temperature reached 750 掳C. SEM observations showed that the phosphors with diameters of 200-400 nm and lengths of 2-3 渭m inherited the tube-like shape from the precursor after calcination in CS₂ atmosphere. Under 325 nm UV excitation, the samples exhibited the strongest red emission at 625 nm, which corresponded to transition from ⁵D₀ to ⁷F₂ level of Eu³⁺ ion. After irradiation with 365 nm UV (Ultraviolet) radiation for 10 min, the nanotubes emitted red long-lasting phosphorescence which could last for about 870 s (1 mcd/m²). And the red-emitting long-lasting phosphorescence was attributed to the persistent energy transfer from the traps to the Ti⁴⁺ and Mg²⁺ ions.