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Optical Materials Express · 2016 ·Vol. 6 ·期 2 ·374-380 · IF 2.657

Color-tunable carbon dots/Y2WO6: Eu3+ embedded composite bulk

X. Y. Chen,Z. J. Zhang,F. F. Xu,S. Q. Shi,J. T. Zhao

A color-tunable fluorescence composite bulk based on carbon dots and Y2WO6: Eu3+ as blue and red emitting materials, respectively, was fabricated. Due to the different excitation regions of the two materials, the emission color of the composite can be tuned from red, across magenta into the blue via varying excitation wavelengths. At the same time, the material is still considerably optically transparent, which demonstrates a clear advantage for integration into real applications.

CAS / MDL: 94-36-0 5949-29-1 1308-96-9 80-62-6 1314-36-9 7697-37-2

研究领域: 材料科学 · 光学

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JOURNAL OF MATERIALS SCIENCE · 2016 ·Vol. 52 ·期 6 ·3110-3123 · IF 2.302

Controlled hydrothermal synthesis and luminescent properties of Y2WO6:Eu3+ nanophosphors for light-emitting diodes

Li Jingang,Wu Zheyi,Sun Xiaoyu,Zhang Xianwen,Dai Rucheng,Zuo Jian,Zhao Zhi

In this paper, Eu 3+ -doped yttrium tungstate (Y 2 WO 6 ) nanophosphors with different morphologies have been synthesized by a hydrothermal method with the assistance of cetyltrimethyl ammonium bromide. X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and photoluminescence spectroscopy (PL) were used to characterize the products. The pH value of the starting solution plays a crucial role in the structures and morphologies of the samples. When the precursors synthesized under alkaline condition are annealed at 1100 °C in the air, the pure monoclinic Y 2 WO 6 phase can be obtained. The results of HRTEM and SAED are consistent with those of the XRD patterns, confirming the high crystallinity of the products. A detailed study of the optical properties, including the UV–Vis diffuse reflection spectra, the excitation and emission spectra, CIE coordinate, and color purity of Y 2 WO 6 :Eu 3+ nanophosphors with different doping concentrations, are presented here. The critical distance R c and energy transfer mechanism for the concentration quenching of Eu 3+ ions are discussed in detail. In addition, the decay time and the thermal stability of the samples have been also investigated elaborately. The PL properties of the as-synthesized materials indicate promising applications in UV-pumped red light-emitting diodes.

研究领域: 材料科学 · 无机化学 · 纳米技术 · 光电子学 · 固体物理 · 稀土发光材料

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Color-tunable carbon dots/Y2WO6: Eu3+ embedded composite bulk

Controlled hydrothermal synthesis and luminescent properties of Y2WO6:Eu3+ nanophosphors for light-emitting diodes