Effect of flux on the composition and luminescent properties of Ca 0.68 Mg 0.2 SiO 3 :0.12Eu 3+ red phosphor

Wang, Jin shan; Zhu, Daoben; Zheng, Qi; Han, Tao

doi:10.1016/j.jlumin.2016.06.063

Cited by 10 publications

(6 citation statements)

References 26 publications

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“…A flux is typically used in preparing phosphor powders through a solid-state reaction method, producing regular-shaped particles and enlarged crystallites, which cause the emission intensity to be enhanced [7][8][9][13][14][15][16][17]. However, this process is rarely researched for nanocrystalline, submicrometer-sized phosphors prepared by wet chemical processes [18][19][20][21]. Table 1 shows the effect of various flux compositions on phosphor properties for application in nUV-LED lighting [7][8][9][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…However, this process is rarely researched for nanocrystalline, submicrometer-sized phosphors prepared by wet chemical processes [18][19][20][21]. Table 1 shows the effect of various flux compositions on phosphor properties for application in nUV-LED lighting [7][8][9][13][14][15][16][17][18][19][20][21]. In each case, the phosphor properties (e.g., quantum efficiency, particle size and surface smoothness) were enhanced with the addition of a flux.…”

Section: Introductionmentioning

confidence: 99%

“…In each case, the phosphor properties (e.g., quantum efficiency, particle size and surface smoothness) were enhanced with the addition of a flux. In fact, after adding a flux, aluminates and oxides showed enlarged particles and smooth particle surfaces [7,8,15,18], silicates and oxy-nitrides have larger crystallite sizes and regular particle morphology [14,16,19,20]. Most importantly, these phosphors all have enhanced emission intensity or quantum efficiencies with the addition of a flux.…”

Section: Introductionmentioning

confidence: 99%

“…A flux is typically mixed with reactants [7,8,[14][15][16]19] or as-synthesized product [20] before an annealing step; thus, is present as the molten phase during the post-synthesis annealing process. Since the flux material should be evaporated after annealing to avoid formation of impurities or second phases in the final product, the melting and boiling temperatures should be considered in relationship to the annealing conditions (temperature, atmosphere), when selecting a flux material.…”

Section: Introductionmentioning

confidence: 99%

“…The emission intensity decreased when the concentration of BaF 2 was higher than 0.5 wt.%, which was attributed to particle agglomeration. Wang et al [20] examined the effect of Li 2 CO 3 and K 2 CO 3 fluxes on the formation of Ca 0.68 Mg 0.2 Eu 0.12 SiO 3 prepared by a co-precipitation method. The crystallite size increased from~93 nm to 99 nm (6% of Li 2 CO 3 ) or to 100 nm (5% of K 2 CO 3 ), and the quantum efficiencies were improved (from 12% to 27% with Li 2 CO 3 flux and to 31% with K 2 CO 3 flux).…”

Section: Introductionmentioning

confidence: 99%

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A Facile Method Using a Flux to Improve Quantum Efficiency of Submicron Particle Sized Phosphors for Solid-State Lighting Applications

Novitskaya

Hirata³

et al. 2018

Ceramics

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This work successfully verified that the addition of a flux (NH 4 F, NH 4 Cl, and H 3 BO 3 ) during synthesis has an impact on the crystallite size and quantum efficiency of submicron-sized particles of CaMgSi 2 O 6 :Eu 2+ phosphors. The addition of NH 4 F or NH 4 Cl increased the crystallite size in the submicron-sized particles, yielding an increase in emission intensity and quantum efficiency. On the other hand, the use of the H 3 BO 3 flux crystallized a secondary phase, SiO 2 , and changed the lattice parameters, which degraded the luminescent properties. In addition, an excessive amount of NH 4 Cl was examined, resulting in nucleation of a secondary phase, CaSiO 3 , which changed the lattice parameters with no improvement in luminescent properties. These results demonstrate that the addition of a flux could be a method to improve the quantum efficiency of submicron-sized particles composed of nanocrystallites; however, a judicious choice of the flux composition and amount has to be carefully considered.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Facile Method Using a Flux to Improve Quantum Efficiency of Submicron Particle Sized Phosphors for Solid-State Lighting Applications

Novitskaya

Hirata³

et al. 2018

Ceramics

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Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode

et al. 2017

Self Cite

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Abstractpoor color rendering index and low stability of CCT. [1,4] Given that issue, it is necessary to explore single-phase white emissive phosphors for application in w-LEDs.Numerous efforts have previously been made to develop codoped single-phase white-emitting phosphors. [5,6] However, with the tri-doped phosphor it is easier to achieve tri-chromatic (RGB) emission with complete coverage when compared with co-doped phosphors. It is well known that the mixture of RGB emissions is more beneficial to generate an ideal warm white-light emission according to trichromatic theory. [7] Hence, more researchers have devoted themselves to developing the more complex tri-doped single-phase white-emitting phosphors. For example, Jiang and colleagues [8] It is a known reality that most phosphors are prepared via a conventional solid-state route, which has unavoidable disadvantages such as high synthesis temperature, nonhomogeneous mixtures and uncontrollable morphology. In particular, the obtained particles are very large with sizes in the range 1-10 μm. [9,10] In recent years, more researchers have focused on the co-precipitation method, which can overcome the above disadvantages and obtain nanophosphors with excellent luminescence properties. [9][10][11][12][13][14] Among these, Yi and colleagues [15] short, the co-precipitation method is very safe, energy-saving, timesaving option.At present, the most common hosts are aluminate and silicate systems with high stability and high QE. [16] But their synthesis conditions are harsh, in particular the synthesis temperatures are often as high as 1300°C. [17] Other materials, such as tungsten phosphate and rare earth oxides, can be easily synthesized, however they are chemically instable.[18] Barium pyrophosphate is a promising host for luminescent materials due to its low sintering temperature and stability. [18][19][20] Among the trivalent rare earth ions, Tb 3+ ion has been used frequently as the green emission center owing to its predominant 5 D 4 ! 7 F 5 transition with a peak centered at 545 nm. However, because of the forbidden transition and the weak absorption of Tb 3+ ion in the NUV region, the emission efficiency is low. [20,21] As is well known, Ce 3+ and Eu 2+ are often considered as the most important activator and effective sensitizer for Tb 3+ because of their unique electronic energy levels. [22][23][24][25] To the best of our knowledge, the crystal structures and lumines- | CharacterizationThe crystal phase of phosphor sample was analyzed by a SHIMADZU XRD-6000 diffractometer (Shimadzu Co., Japan) with Ni-filtered Cu single-phase. Ba 2 P 2 O 7 crystallized as a hexagonal structure with a space group p-62m and the lattice parameters were determined to be a = b = 9.415Å, c = 7.078Å, the crystal structure diagram of which is presented in Figure 2(a). The hexagonal form of Ba 2 P 2 O 7 signified that the sample host was at a higher temperature phase as σ-Ba 2 P 2 O 7 .Ba ions have two different types of coordination environments, in which one is coordinated b...

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Photoluminescence properties and crystal structure of color-tunable yellow–orange–carroty–red emissive Sr2(1−x)NaxP2O7:xSm3+ phosphors for near-UV/blue light-based white LEDs

Liu

Zhu

Yang

et al. 2018

J Mater Sci: Mater Electron

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Effect of flux on the composition and luminescent properties of Ca 0.68 Mg 0.2 SiO 3 :0.12Eu 3+ red phosphor

Cited by 10 publications

References 26 publications

A Facile Method Using a Flux to Improve Quantum Efficiency of Submicron Particle Sized Phosphors for Solid-State Lighting Applications

A Facile Method Using a Flux to Improve Quantum Efficiency of Submicron Particle Sized Phosphors for Solid-State Lighting Applications

Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode

Photoluminescence properties and crystal structure of color-tunable yellow–orange–carroty–red emissive Sr2(1−x)NaxP2O7:xSm3+ phosphors for near-UV/blue light-based white LEDs

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Effect of flux on the composition and luminescent properties of Ca 0.68 Mg 0.2 SiO 3 :0.12Eu 3+ red phosphor

Cited by 10 publications

References 26 publications

A Facile Method Using a Flux to Improve Quantum Efficiency of Submicron Particle Sized Phosphors for Solid-State Lighting Applications

A Facile Method Using a Flux to Improve Quantum Efficiency of Submicron Particle Sized Phosphors for Solid-State Lighting Applications

Luminescent properties of single‐phase Ba2‐x‐1.5y‐1.5zP2O7:xEu2+,yCe3+, zTb3+ phosphors for white light‐emitting diode

Photoluminescence properties and crystal structure of color-tunable yellow–orange–carroty–red emissive Sr2(1−x)NaxP2O7:xSm3+ phosphors for near-UV/blue light-based white LEDs

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Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode