Enhancement of blue emission in Ce3+, Eu2+ activated BaSiF6 downconversion phosphor by energy transfer mechanism: A photochromic phosphor

Kadam, Abhijeet R.; Mishra, G. C.; Deshmukh, Abhay D.; Dhoble, S.J.

doi:10.1016/j.jlumin.2020.117676

Cited by 41 publications

(13 citation statements)

References 37 publications

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“…The particle sizes were distributed over a submicrometre range that made them advantageous for solid‐state lighting. [ 36 ] The voids and porosity noted in the SEM micrographs may be due to the emission of gas and an inappropriate distribution of temperature, respectively, throughout the synthesis. [ 37,38 ] The anomaly of molecule size was due to the temperature gradient during sintering.…”

Section: Resultsmentioning

confidence: 99%

“…As demonstrated in Figure 9, slope log(x) vs log(I/s) was found to be −1.2447 for θ = 3.7341 and indicated that the exchange interaction was the predominant interaction accountable for concentration quenching in the RE emission for YZO:Sm 3+ phosphors. [ 36 ]…”

Section: Resultsmentioning

confidence: 99%

“…As demonstrated in Figure 9, slope log(x) vs log(I/s) was found to be À1.2447 for θ = 3.7341 and indicated that the exchange interaction was the predominant interaction accountable for concentration quenching in the RE emission for YZO: Sm 3+ phosphors. [36] PL excitation spectra of Eu 3+ -activated YZO phosphors at emission of 618 nm are shown in Figure 10. The proposed PL excitation spectra revealed three narrow peaks positioned at 395 nm, 466 nm, and 534 nm.…”

Section: Photoluminescence Studiesmentioning

confidence: 99%

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Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

et al. 2022

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Pyrochlore phosphors have shown their worth in modern day lighting in the last few years. Colour tunability of the phosphor is one of the modern techniques used to obtain white light‐emitting diodes (WLEDs). In the proposed work, Y2Zr2O7:Sm3+,Eu3+ phosphors were investigated for WLED applications as well as display devices. A convectional solid‐state diffusion method was used to synthesize the proposed phosphors. X‐ray diffraction of the proposed phosphors was performed and compared with the standard Inorganic Crystal Structure Database. The crystal structure of the sample was cubic in nature, obtained from Rietveld refinement. Vibrational and morphological studies on the samples were carried out using Fourier transform infrared spectroscopy and scanning electron microscopy analysis. The photoluminescence study of the colour tunable phosphor showed the characteristic peak of Sm3+ together with the two sharp peaks of Eu3+ ions. Greenish yellow to red colour tunability was observed in the proposed phosphor with enhancement of Eu3+ ions. All these results showed the worth of this sample for WLEDs applications as well as in display devices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Photoluminescence Studiesmentioning

confidence: 99%

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Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

et al. 2022

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“…This point where maximum intensity occurred with respect to concentration of ions or exposure rate is called a concentration quenching point and the phenomenon occurring here is known as a concentration quenching phenomenon. [19][20][21] On increasing exposure rate, TL glow curve intensity carries on diminishing after a particular exposure and the sample shows a concentration quenching effect. The different dose rate study shows the maximum intensity of the irradiated phosphor at 456 Gy observed at a peak centered at 200 C as displayed in Figure 6 which is useful in dosimetric properties.…”

Section: The Thermoluminescence Studiesmentioning

confidence: 99%

Tailoring of thermoluminescent properties and assessment of trapping parameters of natural fluorite samples from Dogargaon fluorite mines, India

et al. 2021

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Mineral fluorite or fluorspar (CaF 2 ) can host significant quantities of trivalent REE 3+ (rare earth element) by substitution with divalent Ca 2+ . The fluorites associated with carbonatites are often REE-rich compared to those derived from sedimentary, hydrothermal, or Mississippi Valley-type (MVT) fluorites. The naturally occurring fluorites have several industrial applications one of which is for luminescence. Whether or not REE enriched, the fluorite makes an ideal host for REEs, which are very important phosphors. The naturally occurring fluorites are available in sufficient quantities to cater to the industrial demand. Investigations have been carried out on the fluorites from active fluorite mines at Dongargaon in central India. Thermoluminescence behavior of a natural fluorite sample was investigated using a Nucleonix TL 1009I thermoluminescence reader. Multiple traps formed in the broad thermoluminescent (TL) glow curve were found by TL anal deconvolution software. Trapping parameters for all multiple traps formed on deconvoluting broad TL glow curve were found by different methods like Initial rise method, Chen's Peak shape method and Ilich method.

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“…Therefore, there is usually energy transfer from Ce 3+ to Eu 2+ , whether in oxides, nitrides, fluorides, nitrogen oxides, phosphates, borates, silicates, or in most aluminate and aluminosilicate . In these host materials, when Ce 3+ and Eu 2+ are codoped, the Forster resonant energy transfer may perhaps occur, and a necessary condition for the realization of the energy transfer process is the existence of a sufficient spectral overlap between the emission of the donor and the absorption of the acceptor, and a suitable distance between the donor and the acceptor . In the vast majority of materials, the luminescence centers of Ce 3+ ions have higher energy than those of Eu 2+ ions; in other words, the emission spectra of Ce 3+ ions tend to overlap with the excitation spectra of Eu 2+ ions, and thus energy transfer from Ce 3+ to Eu 2+ can often occur.…”

Section: Introductionmentioning

confidence: 99%

Luminescence and Energy Transfer of Color-Tunable Y₂Mg₂Al₂Si₂O₁₂:Eu²⁺,Ce³⁺ Phosphors

Zhang

Zheng

et al. 2021

Inorg. Chem.

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Color-tunable phosphors can be obtained through codoping strategies and energy transfer regulation. Ce 3+ and Eu 2+ are the most common and effective activator ions used in phosphor materials. However, the energy transfer from Eu 2+ to Ce 3+ is rarely reported. In this work, Y 2 Mg 2 Al 2 Si 2 O 12 (YMAS):Eu 2+ ,Ce 3+ phosphors were successfully synthesized, which was confirmed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Rietveld refinement, scanning electron microscopy (SEM) and element mapping images, and spectral information. The luminescent color of YMAS:Eu 2+ ,Ce 3+ phosphors could be tuned from blue to cyan to light green to yellow-green and finally to green-yellow, which was achieved by adjusting the energy transfer between different dopants. The energy transfer from Eu 2+ to Ce 3+ was confirmed by photoluminescence spectra and fluorescence decay curves. Within the experimental gradient, the energy transfer efficiency could reach up to 48%. At 373 K, the Y 1.99 Mg 1.99 Al 2 Si 2 O 12 :0.01Eu 2+ ,0.01Ce 3+ (YMAS:0.01Eu 2+ ,0.01Ce 3+ ) phosphor exhibited a total integral emission loss of only 8%, and the emission peak intensity decreased to 95%, indicating the excellent thermal stability. The white light-emitting diode (WLED) fabricated by the YMAS:0.01Eu 2+ ,0.01Ce 3+ phosphor has the same level correlated color temperature (CCT = 5841 K), greatly improved color rendering index (R a = 87.8), and higher quality white light color (CIE = (0.3258, 0.3214)) than the WLED made by the YMAS:0.01Eu 2+ phosphor, indicating that the performance of the phosphor was significantly improved by introducing Ce 3+ . This work provides an effective guide for the design and development of highly efficient color-tunable phosphors involving energy transfer from Eu 2+ to Ce 3+ in some specific materials, such as garnet structures.

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Enhancement of blue emission in Ce3+, Eu2+ activated BaSiF6 downconversion phosphor by energy transfer mechanism: A photochromic phosphor

Cited by 41 publications

References 37 publications

Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Tailoring of thermoluminescent properties and assessment of trapping parameters of natural fluorite samples from Dogargaon fluorite mines, India

Luminescence and Energy Transfer of Color-Tunable Y₂Mg₂Al₂Si₂O₁₂:Eu²⁺,Ce³⁺ Phosphors

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Enhancement of blue emission in Ce3+, Eu2+ activated BaSiF6 downconversion phosphor by energy transfer mechanism: A photochromic phosphor

Cited by 41 publications

References 37 publications

Luminescence study of Sm3+,Eu3+‐doped Y2Zr2O7 host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Luminescence study of Sm3+,Eu3+‐doped Y2Zr2O7 host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Tailoring of thermoluminescent properties and assessment of trapping parameters of natural fluorite samples from Dogargaon fluorite mines, India

Luminescence and Energy Transfer of Color-Tunable Y2Mg2Al2Si2O12:Eu2+,Ce3+ Phosphors

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Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Luminescence and Energy Transfer of Color-Tunable Y₂Mg₂Al₂Si₂O₁₂:Eu²⁺,Ce³⁺ Phosphors