Energy Transfer and Tunable Luminescence of NaLa(PO3)4:Tb3+/Eu3+ under VUV and Low-Voltage Electron Beam Excitation

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• 作者：Chunmeng Liu ; Dejian Hou ; Jing Yan ; Lei Zhou ; Xiaojun Kuang ; Hongbin Liang ; Yan Huang ; Bingbing Zhang ; Ye Tao
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：February 13, 2014
• 年：2014
• 卷：118
• 期：6
• 页码：3220-3229
• 全文大小：725K
• ISSN：1932-7455

文摘

Series of NaLa(PO₃)₄:Tb³⁺/Eu³⁺ phosphors were prepared by a high-temperature solid-state reaction technique. Structure refinements were performed based on powder X-ray diffraction (XRD) data. VUV鈥揢V鈥搗is photoluminescence (PL), fluorescence decays, time-resolved emission spectra (TRES), and low-voltage cathodoluminescence (CL) spectra were utilized to investigate the luminescence and energy transfer processes. Under VUV鈥揢V light and low-voltage electron beam excitation, NaLa(PO₃)₄:Tb³⁺ and NaLa(PO₃)₄:Eu³⁺ exhibit characteristic emissions of Tb³⁺ (⁵D_4聽鈫?⁷F_J) and Eu³⁺ (⁵D₀ 鈫?⁷F_J), respectively. By adjusting the doping concentration of Eu³⁺ ions in NaTb_0.70La_(0.30-x)Eu_x(PO₃)₄, tunable emission colors are realized in a large color gamut, in which energy transfer from Tb³⁺ to Eu³⁺ was observed and discussed in detail. On the basis of the good VUV鈥搗is PL and CL properties, NaLa(PO₃)₄:Tb³⁺/Eu³⁺ phosphors might be promising for applications in plasma display panels (PDPs) and field emission displays (FEDs).