Hybrid precursors synthesis and optical properties of LnNbO4:Bi3+ blue phosphors and Bi3+ sensitizing of on Dy3+'s luminescence in YNbO4 matrix

Xiao, Xu; Yan, Bing

doi:10.1016/j.jallcom.2005.11.035

Cited by 74 publications

(29 citation statements)

References 22 publications

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“…25) Many studies on the synthesis and characterization of rare earth niobate have been done using several preparation methods such as solid state reaction, 26),27) flux method, 28),29) combustion synthesis, 30) the method based on complexes, 31) hydrothermal method, 32), 33) and co-precipitation. 34 ) in the Teflon container was then placed in a stainless-steel vessel. The vessel was tightly sealed and it was heated at 180240°C for 5 h under rotation at 1.5 rpm.…”

Section: )14)mentioning

confidence: 99%

Direct synthesis of nanocrystalline GdNbO4 and GdNbO4-based phosphors doped with Eu3+ through hydrothermal route

Hirano

Ishikawa

2016

J. Ceram. Soc. Japan

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Nanocrystalline gadolinium niobate, GdNbO 4 with fergusonite structure was directly formed from the precursor solution mixtures of GdCl 3 and NbCl 5 under weakly basic conditions at temperatures higher than 210°C for 5 h in the presence of aqueous ammonia via hydrothermal route. The as-prepared GdNbO 4 nanocrystals and those after heating at 10001300°C showed UVblue and broad-band emission centered at 435 nm under excitation at 266 nm due to the blue recombination luminescence, associated with charge transfer transitions involving the tetrahedral NbO 4 group. The fergusonite-type complete solid solution nanocrystals having good luminescence in the red spectral region in the GdNbO 4 EuNbO 4 system were directly formed under hydrothermal conditions at 240°C. The photoluminescence spectra of the as-prepared nanocrystalline solid solutions containing europium under excitation at 240 nm are responsible for the characteristic weak orange luminescence (592 nm) and strong red luminescence (611 nm , the maximum intensity of red emission was observed and the emission was even more enhanced via heating at 1300°C.

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Section: )14)mentioning

confidence: 99%

Direct synthesis of nanocrystalline GdNbO4 and GdNbO4-based phosphors doped with Eu3+ through hydrothermal route

Hirano

Ishikawa

2016

J. Ceram. Soc. Japan

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“…8,9 Moreover, LaNbO 4 can transfer the absorbed energy to other emitting species, leading to different fluorescence emissions. 10,11 This oxide has been prepared by a number of techniques; for example, spray pyrolysis (SP), [12][13][14] solid-state reaction, [15][16][17] reactions in solution [18][19][20] and sol-gel route. 10,21 However, with an exception of our previously published work, 22 the authors were not able to finely control the size, shape, and distribution properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dy3+ Amount on the Structural and Luminescence Properties of LaNbO4:Dy3+ Phosphor Obtained by One-Step Spray Pyrolysis Process

Freiria¹,

Ribeiro²,

Verelst³

et al. 2017

J. Braz. Chem. Soc.

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In this study, Dy 3+ -doped LaNbO 4 phosphors with a blue to white emission that can be tuned by varying the activator concentration were prepared by one-step spray pyrolysis process. According to the powder X-ray diffraction results, increasing Dy 3+ concentration favored the tetragonal phase. Slight changes were observed in the recorded Raman spectra as a function of Dy 3+ concentrations while SEM (scanning electron microscopy) micrographs presented similar profiles regardless the Dy 3+ amount. Investigation of Dy 3+ emission data in the visible range showed that rising the Dy 3+ concentration progressively shifted the emission towards the white color. All samples presented a wide excitation range from 254 to 475 nm. Keywords: spray pyrolysis, luminescence, lanthanum niobate IntroductionOver the last years, rare earth ions (RE 3+ ) have received increasing attention: solid-state materials doped with these ions can be applied in color screens, lighting, and optical devices. [1][2][3][4][5] The luminescence properties of these materials heavily depend on the structure of the electron energy levels. In RE 3+ , chemical binding affects these levels very little because orbitals 5s and 5p shield orbital 4f efficiently. 6 The f-f transitions in RE 3+ cause an array of emissions at different wavelengths, giving rise to a plethora of colors. However, f-f transitions are forbidden by the parity selection rule (Laporte rule), so they have low excitation efficiency. Excitation requires the use of a matrix and/or sensitizer that is able to absorb energy and transfer it to an emitting ion. 6,7 Lanthanum niobate (LaNbO 4 ) is a promising material for multifunctional applications. It has a band-gap of approximately 4.8 eV and emits blue and ultraviolet light when excited with ultraviolet (UV) radiation and X-rays, respectively. 8,9 Moreover, LaNbO 4 can transfer the absorbed energy to other emitting species, leading to different fluorescence emissions. 10,11 This oxide has been prepared by a number of techniques; for example, spray pyrolysis (SP), 12-14 solid-state reaction, 15-17 reactions in solution [18][19][20] and sol-gel route. 10,21 However, with an exception of our previously published work, 22 the authors were not able to finely control the size, shape, and distribution properties. Moreover, the SP process is completed in only several seconds, while other currently available methods require several hours or days to complete the process, even requiring a post annealing treatment. Briefly, SP process involves the vaporization of precursor solution followed by the drying, precipitation and decomposition in heated tubular furnace reactors. The stoichiometric ratio in the final prepared material is the same as the precursor solution, since the reaction and aggregation volume are confined in each generated micrometric droplet, which can be seen as a micro reactor. Therefore, particles synthesized by the SP process can be obtained on a laboratory or on an industrial scale. [22][23][24][25] Among the various material...

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“…Thus, niobates are regarded as ideal host materials for luminescence. These materials are applied in the field of X-rays [7,8], and recently they have been reported to be used as ultraviolet luminescent materials [9,10]. Currently, with the development of LED technology, people have been interested in niobates used in the area of LEDs due to their chemical stability and simple process of synthesis.…”

Section: Introductionmentioning

confidence: 99%

Luminescence properties of novel red-emitting phosphor InNb_1-xP_xO₄:Eu³⁺ for white light emitting-diodes

Tang

et al. 2015

Materials Science-Poland

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InNb 1−x P x O 4 :Eu 3+ red phosphors were synthesized by solid-state reaction and their luminescence properties were also studied through photoluminescence spectra. The excitation and emission spectra make it clear that the as-prepared phosphors can be effectively excited by near-ultraviolet (UV) 394 nm light and blue 466 nm light to emit strong red light located at 612 nm, due to the Eu 3+ transition of 5 D 0 → 7 F 2 . The luminescence intensity is dependent on phosphorus content, and it achieves the maximum at x = 0.4. Excessive phosphorus in the phosphors can result in reduction of luminescence intensity owing to concentration quenching. With the increasing content of phosphorus, the phosphors are prone to emit pure red light. This shows that the InNb 1.6 P 0.4 O 4 :0.04Eu 3+ phosphor may be a potential candidate as a red component for white light emitting-diodes.

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Hybrid precursors synthesis and optical properties of LnNbO4:Bi3+ blue phosphors and Bi3+ sensitizing of on Dy3+'s luminescence in YNbO4 matrix

Cited by 74 publications

References 22 publications

Direct synthesis of nanocrystalline GdNbO<sub>4</sub> and GdNbO<sub>4</sub>-based phosphors doped with Eu<sup>3+</sup> through hydrothermal route

Direct synthesis of nanocrystalline GdNbO<sub>4</sub> and GdNbO<sub>4</sub>-based phosphors doped with Eu<sup>3+</sup> through hydrothermal route

Effect of Dy3+ Amount on the Structural and Luminescence Properties of LaNbO4:Dy3+ Phosphor Obtained by One-Step Spray Pyrolysis Process

Luminescence properties of novel red-emitting phosphor InNb_1-xP_xO₄:Eu³⁺ for white light emitting-diodes

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Hybrid precursors synthesis and optical properties of LnNbO4:Bi3+ blue phosphors and Bi3+ sensitizing of on Dy3+'s luminescence in YNbO4 matrix

Cited by 74 publications

References 22 publications

Direct synthesis of nanocrystalline GdNbO<sub>4</sub> and GdNbO<sub>4</sub>-based phosphors doped with Eu<sup>3+</sup> through hydrothermal route

Direct synthesis of nanocrystalline GdNbO<sub>4</sub> and GdNbO<sub>4</sub>-based phosphors doped with Eu<sup>3+</sup> through hydrothermal route

Effect of Dy3+ Amount on the Structural and Luminescence Properties of LaNbO4:Dy3+ Phosphor Obtained by One-Step Spray Pyrolysis Process

Luminescence properties of novel red-emitting phosphor InNb1-xPxO4:Eu3+ for white light emitting-diodes

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Luminescence properties of novel red-emitting phosphor InNb_1-xP_xO₄:Eu³⁺ for white light emitting-diodes