Facile one-step hydrothermal synthesis and luminescence properties of Eu3+-doped NaGd(WO4)(2) nanophosphors

作者：Jiang Zehan; Cai Peiqing; Chen Cuili; Pu Xipeng; Kim Sun Il^*; Seo Hyo Jin^*

来源：Materials Chemistry and Physics, 2017, 193: 227-233.

DOI：10.1016/j.matchemphys.2017.02.032

• Hydrothermal synthesis
• NaGd(WO4)(2)
• Luminescence
• Charge transfer band
• Eu3+

Eu3+-doped NaGd(WO4)(2) nanophosphors were synthesized via a facile one-step hydrothermal method without any surfactants or a further heat treatment. X-ray powder diffraction (XRD), scanning electron microscope (SEM), fourier transform infrared spectroscopy (FT-IR), the photoluminescence (PL) excitation and emission spectra, and decay curves were used to characterize NaGd(WO4)(2):Eu3+ phosphors. The results show that the Eu3+-concentration has little influence on the structure and morphology of the as synthesized samples. However, pH value plays a vital role on the structure and morphology of NaGd(WO4)(2). The well-crystallized sheet-like NaGd(WO4)(2) phosphors can be obtained only at pH = 5-7. On the basis of the time -dependent synthesis, a possible growth mechanism of sheet-like architectures is proposed. The luminescence properties of NaGd1-x ELx(WO4)(2))2 (0 <= x <= 1) are investigated. It is found that the charge transfer band of Eu3+ shifts to lower energy and broadens with increasing the Eu3+concentration.

• 出版日期2017-6-1