Oxonitridosilicate Y10(Si6O22N2)O2:Ce3+,Mn2+ Phosphors: A Facile Synthesis via the Soft-Chemical Ammonolysis Process, Lumin

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• 作者：Dongling Geng ; Hongzhou Lian ; Mengmeng Shang ; Yang Zhang ; Jun Lin
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：February 17, 2014
• 年：2014
• 卷：53
• 期：4
• 页码：2230-2239
• 全文大小：752K
• ISSN：1520-510X

文摘

Ce³⁺- and/or Mn²⁺-activated Y₁₀(Si₆O₂₂N₂)O₂ phosphors have been prepared via a soft-chemical ammonolysis method. Structure refinement, scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared, and thermogravimetry analysis have been employed to characterize the phase purity, crystal structure, morphology, crystallization condition, chemical composition, and thermal stability of the products. The photoluminescence and cathodoluminescence properties for Ce³⁺- and Mn²⁺-doped Y₁₀(Si₆O₂₂N₂)O₂ phosphors were studied in detail. For Ce³⁺/Mn²⁺ singly doped Y₁₀(Si₆O₂₂N₂)O₂ phosphors, typical emissions of Ce³⁺ (blue) and Mn²⁺ (reddish-orange) ions can be observed. Especially, Ce³⁺ emission at different lattice sites 4f and 6h has been identified and discussed. Energy transfer from Ce³⁺(I) and Ce³⁺(II) to Mn²⁺ ions in Y₁₀(Si₆O₂₂N₂)O₂:Ce³⁺,Mn²⁺ samples has been validated and confirmed by the photoluminescence spectra and luminescence decay times. A color-tunable emission in Y₁₀(Si₆O₂₂N₂)O₂:Ce³⁺,Mn²⁺ phosphors can be achieved by an energy-transfer process and a change in the doping concentration of the activators. The temperature-dependent photoluminescence properties and degradation property of cathodoluminescence under continuous electron bombardment of as-synthesized phosphors prove that the Y₁₀(Si₆O₂₂N₂)O₂ host has good stability. Therefore, the Y₁₀(Si₆O₂₂N₂)O₂:Ce³⁺,Mn²⁺ phosphors may potentially serve as single-phase blue/reddish-orange phosphors for white-light-emitting diodes and field-emission displays.