Optical properties of Eu, Dy, Mn activated M2SiO4, (M2=Ca, Sr, Zn) orthosilicate phosphors

Raut, Swati; Dhoble, N.S.; Dhoble, S.J.

doi:10.1016/j.jlumin.2012.08.026

Cited by 13 publications

(4 citation statements)

References 35 publications

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“…Kẽm silicat là chất nền có thể pha tạp nhiều chất kích hoạt, cho các sản phẩm có http://doi.org/10.51316/jca.2021. 048 xxx đặc tính phát quang khác nhau [3][4][5][6][7] . Tuy nhiên, kẽm silicat pha tạp Mn 2+ cho màu xanh lá được quan tâm hơn cả do có độ bền nhiệt, bền hóa và có độ phát quang cao [8][9][10][11] .…”

Section: Giới Thiệu Chungunclassified

A novel approach to the preparation of manganese - doped zinc silicate luminescent material according to the precipitation method

Thi¹,

Thi²,

Văn³

et al. 2021

Vietnam j. catal. adsorp.

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The purpose of this work is to study the effect of some precipitation conditions on the luminescent properties of manganese-doped zinc silicate when synthesized in a new approach - impregnated precipitation method. The samples are characterized by thermal analysis, infrared IR, luminescent spectrum (PL), X-ray diffraction spectrum and scanning electron microscope (SEM). The results showed that manganese - doped zinc silicate luminescent material prepared by the impregnated precipitation method has higher luminescence than the traditional co-precipitation method. Samples with the highest luminescent properties were synthesized under the following conditions: concentration of Zn (CH3COO)2 is 1M, the precipitate aging time of 20 minutes, the washed filtered precipitate, impregnated with Mn2+ with a content of 1.5 % mol compared to the total metal, dried at 80 °C and then heat at 900 0C for 45 minutes. The obtained product is single-phase zinc silicate with composition of Zn1,97Mn0,03SiO4, rhombic structure with most particles varying in size of 0.3 - 0.5 µm, emitting green light with λmax = 525 nm when excited by UV rays with wavelength of 254 nm. Forming a single-phase Zn2SiO4 crystal at 900 0C for 45 minutes allowed to reduce the energy required for the sintering process compared with the solid - phase reaction method.

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Section: Giới Thiệu Chungunclassified

A novel approach to the preparation of manganese - doped zinc silicate luminescent material according to the precipitation method

Thi¹,

Thi²,

Văn³

et al. 2021

Vietnam j. catal. adsorp.

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“…Silicate compounds have been extensively studied as host material for phosphors when doped by lanthanide ions . Silicate‐based phosphors have advantages such as relatively broad range of excitation, excellent luminescent characteristics, good chemical stability, easy, and inexpensive preparation . Particularly, Li 2 SrSiO 4 silicate have been investigated due to their diversiform crystal structures, excellent chemical, and thermal stability, in which rare‐earth ions are generally served as activator because of their abundant emission colors from 4f‐4f or 5d‐4f transitions.…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17] Silicate-based phosphors have advantages such as relatively broad range of excitation, excellent luminescent characteristics, good chemical stability, easy, and inexpensive preparation. 18,19 Particularly, Li 2 SrSiO 4 silicate have been investigated due to their diversiform crystal structures, excellent chemical, and thermal stability, in which rareearth ions are generally served as activator because of their abundant emission colors from 4f-4f or 5d-4f transitions. Dy 3+ -doped Li 2 SrSiO 4 is reported to be an excellent luminescent material which could be applied in near-UVexcited white LEDs.…”

Section: Introductionmentioning

confidence: 99%

Tunable emission color of Li₂SrSiO₄:Tb³⁺ due to cross‐relaxation process and optical thermometry investigation

et al. 2018

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A series of Li2SrSiO4:xTb3+ (0.2%, 0.4%, 0.6%, 0.8%, 2%, 4%, and 6%) phosphors were prepared by conventional solid‐state reaction. It was found that this silicate phosphor has a wide excitation band at near‐ultraviolet region (230‐300 nm) due to spin‐allowed 4f 8→4f75d1 transitions of Tb3+ ions, with the exact position dependent on the crystal field of the lattice. The cross‐relaxation process originating from 5D3→5D4 and 7F6→7F0 happened between different Tb3+ ions. It leads to the luminescence color of Li2SrSiO4: xTb3+ tuning from blue to green just by controlling Tb3+ concentrations. Furthermore, concentration quenching mechanism, energy migration type, cross‐relaxation rate and efficiency, are discussed in detail. Finally, optical thermometry properties were investigated via temperature‐dependent emission spectra. The results show that low‐concentration‐doped sample (Li2SrSiO4:0.4%Tb3+) shows remarkable optical thermometry based on fluorescence intensity ratio (FIR) between the blue and green emission of Tb3+ ions, whereas the high‐concentration‐doped sample (Li2SrSiO4:4%Tb3+) demonstrates small emission intensity loss. It illustrates that terbium‐doped silicate phosphor is a multifunctional material with potential application for display field and optical thermometry.

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“…The first method is combination of blue emitting GaN chips and yellow emitting YAG: Ce 3+ phosphors [4], which shows the high color temperature and relatively low color rendering index due to the lack of green and red component [5,6], thereby limiting its applications in construction and medical aspects. The second means which not only can avoid the above disadvantages but also have larger output power and optically stable uses an ultraviolet (UV) or near ultraviolet (NUV) chips to combine red, green and blue phosphors [7]. So it is very important to research green-yellow or red phosphors.…”

Section: Introductionmentioning

confidence: 99%

Luminescence Properties of Phosphor (Sr1-xBax) 1.95 SiO4: 0.05Eu2+

Jiang

Qiu

Lu³

et al. 2015

MSF

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The luminescence properties of green-yellow emitting (Sr1-xBax)1.95SiO4:0.05Eu2+ (0≤x≤1) phosphors were discussed in this paper. These phosphors were synthesized through the high temperature solid-state reaction technique and characterized by X-ray diffraction. The experimental results indicated that all the major phase of prepared phosphors gradually varied from α-Sr2SiO4 (x=0) phase to Ba2SiO4 (x=1) phase, and an intermediate phase between the two phases was observed at x=0.5. The excitation spectra (λem λem=524 nm) and emission spectra (λex λex=400 nm) showed a broad band character with peak located at 365 nm and range from 579 nm to 508 nm, respectively. With the increase of concentration of barium, the thermal stability of the phosphors increased first when x is less than 0.5, and then it decreased when x surpasses 0.5. In addition, luminescence intensity was enhanced with the barium concentration. Under the 400 nm NUV light excitation the (Sr1-xBax) 1.95SiO4:0.05Eu2+ phosphors have a potential application in white LED.

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Optical properties of Eu, Dy, Mn activated M2SiO4, (M2=Ca, Sr, Zn) orthosilicate phosphors

Cited by 13 publications

References 35 publications

A novel approach to the preparation of manganese - doped zinc silicate luminescent material according to the precipitation method

A novel approach to the preparation of manganese - doped zinc silicate luminescent material according to the precipitation method

Tunable emission color of Li₂SrSiO₄:Tb³⁺ due to cross‐relaxation process and optical thermometry investigation

Luminescence Properties of Phosphor (Sr<sub>1-x</sub>Ba<sub>x</sub>)<sub> 1.95</sub> SiO<sub>4</sub>: 0.05Eu<sup>2+</sup>

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Optical properties of Eu, Dy, Mn activated M2SiO4, (M2=Ca, Sr, Zn) orthosilicate phosphors

Cited by 13 publications

References 35 publications

A novel approach to the preparation of manganese - doped zinc silicate luminescent material according to the precipitation method

A novel approach to the preparation of manganese - doped zinc silicate luminescent material according to the precipitation method

Tunable emission color of Li2SrSiO4:Tb3+ due to cross‐relaxation process and optical thermometry investigation

Luminescence Properties of Phosphor (Sr<sub>1-x</sub>Ba<sub>x</sub>)<sub> 1.95</sub> SiO<sub>4</sub>: 0.05Eu<sup>2+</sup>

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Tunable emission color of Li₂SrSiO₄:Tb³⁺ due to cross‐relaxation process and optical thermometry investigation