The effect of flux materials on the physical and optical properties of Eu3+-activated yttrium oxide phosphors

Lee, Hyun Ju; Kim, Kyung Pil; Hong, Gun Young; Yoo, Jae Soo

doi:10.1016/j.jlumin.2010.01.002

Cited by 25 publications

(7 citation statements)

References 15 publications

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“…In addition, defects in the crystal grain are also a main factor to affect the luminescence of phosphor. To overcome the drawbacks mentioned above, adding flux in raw material in the solid-state reaction among various synthetic processes have been used [11,12,13,14,15,16]. For the flux used, a flux material has a melting point below the solid-state reaction temperature, which can dissolve one or more reaction components and allow the materials to enter the reaction zone.…”

Section: Introductionmentioning

confidence: 99%

Role of Fluxes in Optimizing the Optical Properties of Sr0.95Si2O2N2:0.05Eu2+ Green-Emitting Phosphor

et al. 2013

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Chlorides of NH4Cl and SrCl2 and fluorides of AlF3 and SrF2 were added to raw materials acting as the flux for preparing the SrSi2O2N2:Eu2+ phosphor. The effects of the fluxes on the phase formation, particle morphology, particle size, and photoluminescence properties were investigated. The results revealed that particle size, particle morphology and photoluminescence intensity were largely dominated by the type of the flux material and its adding amount. The chloride-based flux was found to favor the formation of the SrSi2O2N2:Eu2+ phase. Among the chloride-based fluxes, the sample added with the SrCl2 flux presented the narrow particle distribution and cleaner surface, with enhanced emission intensity and an increased external quantum efficiency by 68% and 22%, respectively, compared with those of the sample without any flux adding.

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Section: Introductionmentioning

confidence: 99%

Role of Fluxes in Optimizing the Optical Properties of Sr0.95Si2O2N2:0.05Eu2+ Green-Emitting Phosphor

et al. 2013

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“…Hence, some reports of using flux compounds have been presented in order to solve the mentioned weak points [12][13][14][15]. Due to the fact that the melting point of a flux is lower than the solid-state reaction temperature, it may facilitate the reaction process of the compounds without participating in the reaction [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of flux compounds on the luminescence properties of Eu³⁺doped YBO₃phosphors

Rafiaei

2016

Materials Science-Poland

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In this investigation, Eu 3+ doped YBO 3 phosphors were synthesized by conventional solid state method at 1100°C under atmosphere condition. Meanwhile, different amounts of LiCl, BaCl 2 and CaCl 2 were used as the flux compounds to modify the morphology of the phosphor particles and also final luminescent properties. It was concluded that even small amounts of fluxes play a vital role in the growth of particles. Then the emission and excitation photoluminescence spectra were measured respectively at λ exc = 240 nm and λ em = 610 nm and it was found that using 2 wt.% of flux compounds has a significant influence on the emission intensity of YBO 3 phosphors.

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“…Driven by today's ongoing display device improvement (e.g., high‐resolution display devices, field emission displays and high‐power white light‐emitting diodes), synthesis of phosphors with high luminous intensity, excellent chemical and thermal stability is of extraordinary importance . Besides, sphere‐like morphology and uniform particle size is also a critical factor for realizing high‐quality display devices . It is because that sphere‐like morphology can give a high packing density and minimize light‐scattering, whereas uniform particle size can yield high‐quality screen surface, etc .…”

Section: Introductionmentioning

confidence: 99%

“…Besides, sphere‐like morphology and uniform particle size is also a critical factor for realizing high‐quality display devices . It is because that sphere‐like morphology can give a high packing density and minimize light‐scattering, whereas uniform particle size can yield high‐quality screen surface, etc . Several methods such as spray pyrolysis, solvothermal, and hydrothermal method have been reported recently for the preparation of phosphor with spherical shape and uniform size.…”

Section: Introductionmentioning

confidence: 99%

“…Solid‐state reaction (SSR) method is the most popular method for the preparation of polycrystalline solids from a mixture of solid starting materials, and is one of the most promising methods for the preparation of phosphors from the viewpoint of industrial applications. However, it is difficult to control the morphology and size of phosphor particles by high‐temperature SSR …”

Section: Introductionmentioning

confidence: 99%

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Influence of Flux on Morphology and Luminescence Properties of Phosphors: A Case Study on Y_1.55Ti₂O₇:0.45Eu³⁺

et al. 2012

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A series of Y 1.55 Ti 2 O 7 :0.45Eu 3+ phosphors with orange-red emission under near ultraviolet excitation were prepared in solid-state reaction with NH 4 Cl, NH 4 F, H 3 BO 3 , LiF, and NaF as flux, respectively. Comparative studies showed that flux could not only modify the morphology and grain size, but have a significant influence on the spatial distribution of Eu 3+ activator across the Y 2 Ti 2 O 7 host. NaF flux, the best one among the five flux materials, helped the phosphor particles to have a sphere-like morphology, micrometer-level grain size as well as uniform spatial distribution of activator, and enhanced the photoluminescence of Y 1.55 Ti 2 O 7 :0.45Eu 3+ phosphor by a factor of about 16 at an optimal amount. Other fluxes also exhibited positive effect on photoluminescence of the phosphor in a sequence of NH 4 Cl < NH 4 F < H 3 BO 3 < LiF, and influenced the morphology, grain size, activator spatial distribution of the phosphor particles in varied extents. The influence of these flux materials on phosphor grain growth was discussed by the Ostwald ripening mechanism, with consideration of the melting point, boiling point (or decomposition temperature), as well as reactivity of the flux materials. In addition, the influence of flux on photoluminescence intensity and lifetime of Y 1.55 Ti 2 O 7 :0.45Eu 3+ was also discussed.

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The effect of flux materials on the physical and optical properties of Eu3+-activated yttrium oxide phosphors

Cited by 25 publications

References 15 publications

Role of Fluxes in Optimizing the Optical Properties of Sr0.95Si2O2N2:0.05Eu2+ Green-Emitting Phosphor

Role of Fluxes in Optimizing the Optical Properties of Sr0.95Si2O2N2:0.05Eu2+ Green-Emitting Phosphor

Effect of flux compounds on the luminescence properties of Eu³⁺doped YBO₃phosphors

Influence of Flux on Morphology and Luminescence Properties of Phosphors: A Case Study on Y_1.55Ti₂O₇:0.45Eu³⁺

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The effect of flux materials on the physical and optical properties of Eu3+-activated yttrium oxide phosphors

Cited by 25 publications

References 15 publications

Role of Fluxes in Optimizing the Optical Properties of Sr0.95Si2O2N2:0.05Eu2+ Green-Emitting Phosphor

Role of Fluxes in Optimizing the Optical Properties of Sr0.95Si2O2N2:0.05Eu2+ Green-Emitting Phosphor

Effect of flux compounds on the luminescence properties of Eu3+doped YBO3phosphors

Influence of Flux on Morphology and Luminescence Properties of Phosphors: A Case Study on Y1.55Ti2O7:0.45Eu3+

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Effect of flux compounds on the luminescence properties of Eu³⁺doped YBO₃phosphors

Influence of Flux on Morphology and Luminescence Properties of Phosphors: A Case Study on Y_1.55Ti₂O₇:0.45Eu³⁺