Revealing the substitution mechanism in Eu3+:CaMoO4and Eu3+,Na+:CaMoO4phosphors

Becerro, Ana Isabel; Allix, Mathieu; Laguna, Mariano; González-Mancebo, Daniel; Genevois, Cécile; Caballero, A.; Lozano, Gabriel; Núñez, Nuria O.; Ocaña, Manuel

doi:10.1039/c8tc04595j

Cited by 44 publications

(17 citation statements)

References 26 publications

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“…The abnormal movement to the small angle side when y > 3% may be due to the minor non-equivalent substitution of divalent Mg 2+ or mono-valence Li + by trivalent Tm 3+ , which leads to an expansion of the lattice. [29][30][31] Figures 6a and 6b show the y dependent PLE spectra of LYMW: yTm 3+ (y = 0%, 0.1%，0.5%，1%, 2%, 3%, 4%, 6%, 8%, 10%) samples monitored at 455 nm and 475 nm, respectively. The PLE spectrum of pure LYMW: yTm 3+ (y = 0) is also presented for comparison.…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence Properties and Energy Transfers in the Novel LiYMgWO₆: Dy³⁺, Tm³⁺

Fan

et al. 2022

ECS Adv.

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A series of Dy3+/Tm3+ singly doped and co-doped double perovskite-structure compound LiYMgWO6 (LYMW) were prepared by a solid-state route. The structure and photoluminescence properties have been unraveled by combining experiments and first-principles calculations. The crystal structure was determined to be a monoclinic structure with space groups P21. Under the ultraviolet (UV) excitation, Dy3+ and Tm3+ single-doped LYMW samples emit yellowish-white and blue light, respectively. For Dy3+ and Tm3+ co-doped LYMW, the emission can be tuned from blue to white light and eventually to yellow through energy transfers by varying the Dy3+ and Tm3+ concentrations. The sample with 3%Dy3+ and 3%Tm3+ has chromaticity coordinates (0.3405, 0.3378), which are nearest to the ideal white light (0.33,0.33). The energy transfer mechanism is verified to be the quadrupole-quadrupole interaction. The temperature-dependent photoluminescence (PL) spectra show that LYMW: Dy3+, Tm3+ exhibits good thermal stability.

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Section: Resultsmentioning

confidence: 99%

Photoluminescence Properties and Energy Transfers in the Novel LiYMgWO₆: Dy³⁺, Tm³⁺

Fan

et al. 2022

ECS Adv.

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“…[83] Furthermore, in the work of Niedermeier et al [84] dealing with magnesium oxide nanoparticles with added mixtures of iron or cobalt ions, XAS was used to evaluate the coordination and symmetry around the transition-metal ions and to determine their actual oxidation state as a function of the synthesis conditions, as well as to point out a significant segregation of Fe ions into lowcoordinated sites. In a further recent work, [85] the aliovalent substitution mechanism and crystal structure of Eu 3+ :CaMoO 4 and Eu 3+ ,Na + :CaMoO 4 phosphors was addressed using complementary techniques like Raman spectroscopy and XAS. The authors evidenced, by exploiting the local atomic sensitivity of XAS, that the substitution mechanism in the two systems was different.…”

Section: Advanced Structural and Functional Characterization Of Doped Mossmentioning

confidence: 99%

Opportunities from Doping of Non‐Critical Metal Oxides in Last Generation Light‐Conversion Devices

Gatti

Lamberti

Mazzaro

et al. 2021

Advanced Energy Materials

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The need to develop sustainable energy solutions is an urgent requirement for society, with the additional requirement to limit dependence on critical raw materials, within a virtuous circular economy model. In this framework, it is essential to identify new avenues for light‐conversion into clean energy and fuels exploiting largely available materials and green production methods. Metal oxide semiconductors (MOSs) emerge among other species for their remarkable environmental stability, chemical tunability, and optoelectronic properties. MOSs are often key constituents in next generation energy devices, mainly in the role of charge selective layers. Their use as light harvesters is hitherto rather limited, but progressively emerging. One of the key strategies to boost their properties involves doping, that can improve charge mobility, light absorption and tune band structures to maximize charge separation at heterojunctions. In this review, effective methods to dope MOSs and to exploit the derived benefits in relation to performance enhancement in different types of devices are identified and critically compared. The work is focused specifically on the best opportunities coming from the use of non‐critical raw materials, so as to contribute in defining an economically feasible roadmap for light conversion technologies based on these highly stable and widely available compounds.

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“…27 No improvements in the emission of CaMoO 4 :Eu 3+ are found upon co-doping with Na + . 28 upon co-doping with Li + when compared to Na + and K + . 29 Li et al have observed Na + to be a better co-dopant for higher emission in CaMoO 4 :Tb 3+ .…”

Section: Introductionmentioning

confidence: 99%

Insight into the spectroscopic behavior of Dy³⁺‐substituted and Li⁺ charge–compensated molybdate phosphors

et al. 2022

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Efficient utilization of phosphors in solid-state lighting and phosphor-converted light-emitting diodes demands high emission intensity, narrow size distribution, and tunable luminescence. Here in this work, un-doped and Li + co-doped CaMoO 4 :Dy 3+ nanoparticles are synthesized via modified reflux method in ethylene glycol medium at 130 • C. The host shows broad dual band emission centered in blue and green regions endowed by charge transfer and defects.Upon Dy 3+ doping, the host-to-dopant energy transfer causes the CaMoO 4 :Dy 3+ nanoparticles to exhibit characteristic emission lines from Dy 3+ . The Commission Internationale de L'Eclairage (CIE 1931) chromaticity coordinates for the prepared phosphors are estimated and found to lie in the nearly white region of color space. The light output as well as excited state lifetimes are successfully improved by lithium co-doping by virtue of reduced charge compensating defects and sensitization via oxygen-related defects. The positron annihilation studies show that all the lithium concentration co-doped for charge compensation is merely helping in the removal of cations. This work shows the role of lithium co-doping and its optimum concentration in improving the optical properties of phosphors.

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Revealing the substitution mechanism in Eu³⁺:CaMoO₄and Eu³⁺,Na⁺:CaMoO₄phosphors

Abstract: Why is the Eu3+:CaMoO4 unit cell bigger than that of CaMoO4? Does Na+ co-doping improve the quantum yield of Eu3+:CaMoO4 phosphors?

Cited by 44 publications

References 26 publications

Photoluminescence Properties and Energy Transfers in the Novel LiYMgWO₆: Dy³⁺, Tm³⁺

Photoluminescence Properties and Energy Transfers in the Novel LiYMgWO₆: Dy³⁺, Tm³⁺

Opportunities from Doping of Non‐Critical Metal Oxides in Last Generation Light‐Conversion Devices

Insight into the spectroscopic behavior of Dy³⁺‐substituted and Li⁺ charge–compensated molybdate phosphors

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Revealing the substitution mechanism in Eu3+:CaMoO4and Eu3+,Na+:CaMoO4phosphors

Abstract: Why is the Eu3+:CaMoO4 unit cell bigger than that of CaMoO4? Does Na+ co-doping improve the quantum yield of Eu3+:CaMoO4 phosphors?

Cited by 44 publications

References 26 publications

Photoluminescence Properties and Energy Transfers in the Novel LiYMgWO6: Dy3+, Tm3+

Photoluminescence Properties and Energy Transfers in the Novel LiYMgWO6: Dy3+, Tm3+

Opportunities from Doping of Non‐Critical Metal Oxides in Last Generation Light‐Conversion Devices

Insight into the spectroscopic behavior of Dy3+‐substituted and Li+ charge–compensated molybdate phosphors

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Revealing the substitution mechanism in Eu³⁺:CaMoO₄and Eu³⁺,Na⁺:CaMoO₄phosphors

Photoluminescence Properties and Energy Transfers in the Novel LiYMgWO₆: Dy³⁺, Tm³⁺

Photoluminescence Properties and Energy Transfers in the Novel LiYMgWO₆: Dy³⁺, Tm³⁺

Insight into the spectroscopic behavior of Dy³⁺‐substituted and Li⁺ charge–compensated molybdate phosphors