Photoluminescence properties of novel white phosphor of Dy3+-doped LaBSiO5 glass

Liu, Shiqi; Liang, Yujun; Tong, Miaohui; Yu, Dongyan; Zhu, Yongwei; Wu, Xiaoping; Yan, Chunjie

doi:10.1016/j.mssp.2015.04.009

Cited by 30 publications

(5 citation statements)

References 20 publications

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“…The excitation spectra (Figure 5a) 45,46 The broad band at 254 nm in the excitation spectra corresponded to charge transfer band (CTB) from orbital 2p in oxygen to empty orbitals 4d and 4f in Nb 5+ and Dy 3+ , respectively. 22,47 Furthermore, the samples presented a wide excitation range, including all the UV-LED and blue emission regions.…”

Section: Raman Spectroscopymentioning

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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Section: Raman Spectroscopymentioning

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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“…Furthermore, it should be noted that there exists a feeble red emission with a wavelength of 663 nm, which arises from the transitions occurring between the energy levels 4 F 9/2 and 6 H 11/2 56,65 . It is important to mention that the most intense yellow luminescence comes from the electric dipole transition of the Dy 3+ ion, which exhibits a strong sensitivity toward the specific surroundings in which the Dy 3+ ions are situated 66,67 . If the intensity of yellow luminescence exceeds that of blue luminescence, it indicates that the Dy 3+ ions are situated in nearby surroundings with limited symmetry and lacking an inversion center 68,69 .…”

Section: Resultsmentioning

confidence: 99%

“…56,65 It is important to mention that the most intense yellow luminescence comes from the electric dipole transition of the Dy 3+ ion, which exhibits a strong sensitivity toward the specific surroundings in which the Dy 3+ ions are situated. 66,67 If the intensity of yellow luminescence exceeds that of blue luminescence, it indicates that the Dy 3+ ions are situated in nearby surroundings with limited symmetry and lacking an inversion center. 68,69 Conversely, when blue luminescence is stronger than yellow luminescence, it means that Dy 3+ ions have an inverted center in a highly symmetrical environment.…”

Section: The Optical Properties Of the Precursor Glassesmentioning

confidence: 99%

Dy³⁺‐ and/or Sm³⁺‐doped glass–ceramics containing NaGd(MoO₄)₂ crystalline phase for warm white light applications

Tong,

Luo,

Liu

et al. 2024

J Am Ceram Soc.

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The transparent glass–ceramics with Dy3+ and/or Sm3+ doping, which include the NaGd(MoO4)2 single‐crystal phase, were synthesized using the melt‐quenching method followed by heat treatment in the SiO2–B2O3–Na2O–ZnO–MoO3–Gd2O3 system. The formation and fluorescent properties of Dy3+ single‐doped precursor glasses were thoroughly examined, and the optimal doping amount of Dy2O3 was determined to be 0.3 mol% by fluorescence spectroscopy. The ideal heat treatment procedure for glass–ceramics containing Dy3+ and Sm3+ was determined to be crystallized at a temperature of 650°C for a duration of 7 h. After undergoing heat treatment, the luminescence performance of glass–ceramic is significantly boosted, exhibiting an improvement that is roughly twice as substantial when compared to the precursor glass. Extensive research has been conducted to thoroughly examine the fluorescence capabilities of glass–ceramics doped with both Dy3+ and Sm3+, and the intricate mechanism of energy transfer has been extensively explored. The transparent glass–ceramics doped with Dy3+ and Sm3+ and containing NaGd(MoO4)2 crystal phase can produce tunable luminescence from yellow to orange with a high color purity and a low correlated color temperature, which indicates that they have the potential to be applied to warm white light scenes such as household lighting under ultraviolet excitation.

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“…Many kinds of phosphors based on LBSO powders were studied for their potential application in the fields of luminescence display. Optically active ions, such as Eu 3+ , Bi 3+ , Sm 3+ , Dy 3+ , Ce 3+ , and Tb 3+ , were substituted into LBSO powders that were prepared by sol–gel method or high-temperature solid state reaction. − The obtained phosphors exhibit optical spectroscopy diversity because of the inclusivity of the LBSO crystal structure. It was demonstrated that the LBSO polycrystal powders could be used as a matrix of red or white LEDs.…”

Section: Introductionmentioning

confidence: 99%

Flux Exploration, Growth, and Optical Spectroscopic Properties of Large Size LaBSiO₅ and Eu³⁺-Substituted LaBSiO₅ Crystals

Lin

Zhang

et al. 2017

Crystal Growth & Design

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This article reports the flux composition optimization, crystal growth, and optical spectroscopic properties of LaBSiO 5 and Eu 3+ -substituted LaBSiO 5 crystals. The mixture design technology was successfully applied in the crystal growth area for the first time. By the direction of mixture design method, the composition of a complex flux comprising LaBO 3 , SiO 2 , and Li 2 MoO 4 was optimized and used for growth of LaBSiO 5 crystals. A large size of Eu 3+ -substituted LaBSiO 5 crystal with dimension of 12 × 10 × 8 mm 3 has been prepared by top-seeded solution growth method. As far as we know, it is the first report that active ionsubstituted LaBSiO 5 bulk crystal was obtained from an environmentally friendly flux without fluorides. The optical spectroscopy and electronic transition properties of Eu 3+ -substituted LaBSiO 5 crystals are studied thoroughly by analyzing the excitation and emission spectra and luminescence decay curves. The luminescence of Eu 3+ ions are characteristic of intense red light emission corresponding to transitions of 5 D 0 → 7 F 1 and 5 D 0 → 7 F 2 . Meanwhile, the splitting of emission bands mentioned above is apparent because of the lower symmetry of lattice sites where the active ion locates. Furthermore, the symmetry properties of the lattice sites where Eu 3+ ions locate are investigated by using Judd−Ofelt theory. The value of intensity parameters of Eu 3+ -substituted LaBSiO 5 ranges from 4.19 to 4.89 when the Eu 3+ concentration varies.

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Photoluminescence properties of novel white phosphor of Dy3+-doped LaBSiO5 glass

Cited by 30 publications

References 20 publications

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

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

Dy³⁺‐ and/or Sm³⁺‐doped glass–ceramics containing NaGd(MoO₄)₂ crystalline phase for warm white light applications

Flux Exploration, Growth, and Optical Spectroscopic Properties of Large Size LaBSiO₅ and Eu³⁺-Substituted LaBSiO₅ Crystals

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Photoluminescence properties of novel white phosphor of Dy3+-doped LaBSiO5 glass

Cited by 30 publications

References 20 publications

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

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

Dy3+‐ and/or Sm3+‐doped glass–ceramics containing NaGd(MoO4)2 crystalline phase for warm white light applications

Flux Exploration, Growth, and Optical Spectroscopic Properties of Large Size LaBSiO5 and Eu3+-Substituted LaBSiO5 Crystals

Contact Info

Product

Resources

About

Dy³⁺‐ and/or Sm³⁺‐doped glass–ceramics containing NaGd(MoO₄)₂ crystalline phase for warm white light applications

Flux Exploration, Growth, and Optical Spectroscopic Properties of Large Size LaBSiO₅ and Eu³⁺-Substituted LaBSiO₅ Crystals