کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
608899 880611 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rare earth β-NaGdF4 fluorides with multiform morphologies: Hydrothermal synthesis and luminescent properties
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Rare earth β-NaGdF4 fluorides with multiform morphologies: Hydrothermal synthesis and luminescent properties
چکیده انگلیسی

In this paper, the synthesis of rare earth fluoride β-NaGdF4 with multiform morphologies via a facile hydrothermal method has been fulfilled. The phases and shapes of the products can be tuned by changing the experimental parameters, including F− source and pH value of mother liquor. The morphologies for the products range from submicrorods, submicrospheres, dumbbell-like nanorods, cobblestone-like particles to aggregates constructed from nanoparticles. The results indicate that F− source and pH value play a critical role in determining the morphologies of the final products. Additionally, we investigate the photoluminescence (PL) properties of Ce3+/Ln3+ (LnEu, Tb and Dy) codoped down-conversion (DC) and Yb3+/Er3+ (Tm3+, Ho3+) codoped up-conversion (UC) in β-NaGdF4 host lattices. In the process of DC photoluminescence, energy transfer has occurred. This energy transfer occurs through the energy migration process like S → Gd3+ → (Gd3+)n → A (S represents the sensitizer and A represents the activator) and the Gd3+ plays an intermediate role in the process.

Rare earth fluorides β-NaGdF4 nano/microstructures with multiform shapes and sizes as well as fruitful emission properties were synthesized by a simple hydrothermal process.Figure optionsDownload high-quality image (201 K)Download as PowerPoint slideResearch highlights
► A facile and effective hydrothermal method was developed to prepare gadolinium fluorides (β-NaGdF4 and GdF3) with multiform morphologies and sizes by tuning the pH value and F− sources.
► Simplicity, low-costs, ease of scale-up, the diverse morphologies and relative greenness (aqueous solution) constitute the key traits of this method.
► Multicolor down-conversion and up-conversion emissions can be obtained in β-NaGdF4 host lattice by simply changing the kinds and concentrations of the doping rare earth ions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 354, Issue 2, 15 February 2011, Pages 429–436
نویسندگان
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