Synthesis and Luminescent Properties of GdNbO4:RE3+ (RE = Tm, Dy) Nanocrystalline Phosphors via the Sol鈥揋el Process

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• 作者：Ying L眉 ; Xinghua Tang ; Liushui Yan ; Kexin Li ; Xiaoming Liu ; Mengmeng Shang ; Chunxia Li ; Jun Lin
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：October 24, 2013
• 年：2013
• 卷：117
• 期：42
• 页码：21972-21980
• 全文大小：554K
• 年卷期：v.117,no.42(October 24, 2013)
• ISSN：1932-7455

文摘

Nanocrystalline GdNbO₄:Tm³⁺ and GdNbO₄:Dy³⁺ phosphors were prepared through a Pechini-type sol鈥揼el process. X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, photoluminescence, and cathodoluminescence (CL) spectra were utilized to characterize the synthesized phosphors. XRD reveals that the samples begin to crystallize at 900 掳C and the pure GdNbO₄ phase can be obtained at 1000 掳C. FE-SEM images indicate that the GdNbO₄:Tm³⁺ and GdNbO₄:Dy³⁺ samples consist of fine and spherical grains with a size around 30鈥?0 nm. Under the excitation of UV light (264 nm) and low-voltage electron beams (1鈥? kV), the GdNbO₄:Tm³⁺ and GdNbO₄:Dy³⁺ phosphors showed the characteristic emissions of Tm³⁺ (¹D₂ 鈫?³H₆, ³H₅, ³H₄, and ¹G₄ 鈫?³H₆ transitions) and Dy³⁺ (⁴F_9/2 鈫?⁶H_15/2 and ⁴F_9/2 鈫?⁶H_13/2 transitions), respectively. The blue CL of the GdNbO₄:Tm³⁺ phosphor has higher color purity and comparable intensity to the Y₂SiO₅:Ce³⁺ commercial product. A single-composition white light emitting in response to near UV and low-voltage electron beam excitation has been realized in GdNbO₄:Dy³⁺ phosphor. The obtained GdNbO₄:Tm³⁺ and GdNbO₄:Dy³⁺ phosphors have potential applications in the areas of near UV white-light-emitting diodes and field emission display devices.