Hydrothermal synthesis and luminescence behavior of rare-earth-doped NaLa(WO4)2 powders

Wang, Rui; Fan, Xianping; Pi, Daibo; Wang, Zhiyu; Wang, Minquan

doi:10.1016/j.jssc.2005.01.001

Cited by 59 publications

(39 citation statements)

References 31 publications

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“…The results of fitting yielded the lifetime of ~0.90 ms for both the as-synthesized and 600 °C calcined NaEu(WO 4 ) 2 under 395 nm excitation (Table 1), which is longer than the 0.49 and 0.54 ms reported for the 4.9 at% Eu 3+ doped NaGd(WO 4 ) 2 single crystal and 10 at% Eu 3+ doped NaLa(WO 4 ) 2 microcrystals (λ ex =394 nm, λ em =610 nm), respectively [5,51]. The similar lifetime values of ~0.75/0.79 ms were determined dipole transition (593 nm), as also observed by Wang et al [44][45][46]. Calcination did not bring about any appreciable change to the peak position but enhanced the intensities of the excitation and emission bands.…”

Section: Properties Of the Naln(wo 4 ) 2 (Ln=la-lu And Y)supporting

confidence: 85%

Facile hydrothermal crystallization of NaLn(WO₄)₂ (Ln=La-Lu, and Y), phase/morphology evolution, and photoluminescence

Shi

Wang

et al. 2017

Science and Technology of Advanced Materials

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With the successful synthesis of NaLn(WO 4 ) 2 for the full spectrum of Ln, the effects of lanthanide contraction on the structural features, crystal morphology, and IR responses of the compounds were clarified. The temperature-and timecourse phase/morphology evolutions and the phase conversion upon calcination were thoroughly studied for the Group I and Group II compounds with Ln=La and Lu for example, respectively. Unknown intermediates were characterized by elemental analysis, IR absorption, thermogravimetry, and differential scanning calorimetry to better understand their chemical composition and coordination. The photoluminescence properties of NaEu(WO 4 ) 2 and NaTb(WO 4 ) 2 , including excitation, emission, fluorescence decay, and quantum efficiency of luminescence, were also comparatively studied for the as-synthesized and calcination products.

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Section: Properties Of the Naln(wo 4 ) 2 (Ln=la-lu And Y)supporting

confidence: 85%

Facile hydrothermal crystallization of NaLn(WO₄)₂ (Ln=La-Lu, and Y), phase/morphology evolution, and photoluminescence

Shi

Wang

et al. 2017

Science and Technology of Advanced Materials

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“…The strongest emission is observed due to the 5 D 0 -7 F 2 electric dipole transition (at 616 nm), which is about 5.64 times stronger than that of the magnetic dipole transition 5 D 0 ? 7 F 1 (at 591 nm), indicating that Eu 3? ions are positioned at the sites without inversion symmetry in the NaY(WO 4 ) 2 host [30,39]. Furthermore, in Fig.…”

Section: Photoluminescence Propertiesmentioning

confidence: 90%

“…In consideration of this problem, the hydrothermal method is preferred because the synthesis conditions such as temperature and reaction time can be easily adjusted. Furthermore, the hydrothermal process has proved to be a facile and fast route with low cost and energy consumption, which has been widely employed for the synthesis of inorganic materials including alkali rare earth tungstates [11,12,[28][29][30]. Among the alkali rare earth tungstates, the NaY(WO 4 ) 2 lattice belongs to the scheelite CaWO 4 structures, which consists of two formula units in the unit cell, with space group C 4h 6 (I41/a).…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis, multicolor tunable luminescence and energy transfer of Eu3+ or/and Tb3+ activated NaY(WO4)2 nanophosphors

Liu

Wang

et al. 2016

J Mater Sci: Mater Electron

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Eu 3? and/or Tb 3? doped NaY(WO 4 ) 2 nanomaterials have been successfully synthesized by one-step hydrothermal method. The samples were characterized by X-ray diffraction, field-emission scanning electron microscopy, X-ray energy dispersive spectroscopy, and photoluminescence spectra. The results show that the novel nanoplates with a diameter of 300-600 nm and the thickness of 20-25 nm are observed. Under the excitation of 246 or 230 nm, individual RE 3? ions activated NaY(WO 4 ) 2 phosphors exhibit excellent emission properties in their respective regions. The as-prepared Eu 3? or Tb 3? doped samples show strong red and green emission, originating from the allowed 5 D 0 ? 7 F J (J = 0, 1, 2) transition of the Eu 3? ions and the 5 D 4 ? 7 F J (J = 6, 5, 4, 3) transition of the Tb 3? ions. In addition, by properly tuning the relative concentration of Eu 3? ions in the case of Eu 3? and Tb 3? co-doped systems, tunable emissions in a single component are obtained under the excitation of 230 or 395 nm. Moreover, an energy transfer from Tb 3? to Eu 3? is observed, which has been justified through the luminescence spectra and the fluorescence decay curves. Furthermore, the corresponding luminescence and energy transfer mechanism have been proposed in optical transitions and possible energy transfer scheme. These results indicate that Eu 3? and Tb 3? doped NaY(WO 4 ) 2 phosphors will find potential application in the field of solid-state lighting.

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“…Several chemical synthesis techniques to prepare rare earth doped phosphors are available such as sol-gel, coprecipitation, microwave, combustion, hydrothermal [18][19][20], and all these techniques produce high homogeneity of the ultimate product. But, hydrothermal technique is better over other solution phase conventional techniques in terms of its better homogeneity, low cost, low processing temperature, less energy consumption and uniformity in particle size [21,22].…”

Section: Introductionmentioning

confidence: 99%

EDTA-mediated morphology and tunable optical properties of Eu3+-doped NaY(MoO4)2 phosphor

Yang

Zhang

et al. 2015

J Mater Sci: Mater Electron

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Uniform and well-crystallized NaY(MoO 4 ) 2 : Eu 3? 3D hierarchical flower-like architectures self-assembled from different building blocks have been successfully synthesized by a facile ethylene diamine tetraacetic acid (EDTA)-mediated hydrothermal route. The crystalline phase, size, morphology, and down-conversion luminescence properties were systematically characterized using powder X-ray diffraction, field emission-scanning electron microscopy, photoluminescence (PL) and photoluminescent excitation spectra (PLE), respectively. It was found that the pH value in the initial solution was responsible for the crystal phase determination of final products. The experimental results showed that the amount of EDTA was a key parameter which not only determined their spacial arrangement, but also affected the down-conversion luminescence intensity of the final products. In PL spectrum, a prominent red emission was observed due to the hypersensitive 5 D 0 ? 7 F 2 transition, and the optimum doping level of Eu 3? was 20 %. Two strongest lines at 396 and 467 nm in excitation spectra of these phosphors matched well with the two popular emissions from near ultraviolet and blue GaN-based LEDs, so they could be explored for an efficient red region for white light-emitting diodes.

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Hydrothermal synthesis and luminescence behavior of rare-earth-doped NaLa(WO4)2 powders

Cited by 59 publications

References 31 publications

Facile hydrothermal crystallization of NaLn(WO₄)₂ (Ln=La-Lu, and Y), phase/morphology evolution, and photoluminescence

Facile hydrothermal crystallization of NaLn(WO₄)₂ (Ln=La-Lu, and Y), phase/morphology evolution, and photoluminescence

Hydrothermal synthesis, multicolor tunable luminescence and energy transfer of Eu3+ or/and Tb3+ activated NaY(WO4)2 nanophosphors

EDTA-mediated morphology and tunable optical properties of Eu3+-doped NaY(MoO4)2 phosphor

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Hydrothermal synthesis and luminescence behavior of rare-earth-doped NaLa(WO4)2 powders

Cited by 59 publications

References 31 publications

Facile hydrothermal crystallization of NaLn(WO4)2 (Ln=La-Lu, and Y), phase/morphology evolution, and photoluminescence

Facile hydrothermal crystallization of NaLn(WO4)2 (Ln=La-Lu, and Y), phase/morphology evolution, and photoluminescence

Hydrothermal synthesis, multicolor tunable luminescence and energy transfer of Eu3+ or/and Tb3+ activated NaY(WO4)2 nanophosphors

EDTA-mediated morphology and tunable optical properties of Eu3+-doped NaY(MoO4)2 phosphor

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Facile hydrothermal crystallization of NaLn(WO₄)₂ (Ln=La-Lu, and Y), phase/morphology evolution, and photoluminescence

Facile hydrothermal crystallization of NaLn(WO₄)₂ (Ln=La-Lu, and Y), phase/morphology evolution, and photoluminescence