X-ray photoelectron spectroscopy and optical analysis of pure white light emitting Dy3+ and Mn2+ codoped Na3Y(PO4)2 phosphors for solid-state lighting

Munirathnam, K.; Nagajyothi, P.C.; Prakashbabu, D.; Raju, B. Deva Prasad; Shim, JeoungChill

doi:10.1016/j.ceramint.2018.09.230

Cited by 42 publications

(10 citation statements)

References 45 publications

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“…The two bands centered at 1334.88 eV and 1296.28 eV are attributed to the bound states 3d 3/2 and 3d 5/2 of Dy3d. The lower binding energy band (∼1296.28 eV) shows an asymmetric nature arising due to spin-orbit splitting in Dy3d level and therefore it can be deconvoluted into two or more symmetric peaks [49]. For the Z0.25 sample, this band is deconvoluted into three symmetric…”

Section: Resultsmentioning

confidence: 99%

Improvement in white light emission of Dy³⁺ doped CaMoO₄ via Zn²⁺ co-doping

Dixit¹,

Pandey²,

Chauhan³

et al. 2022

Methods Appl. Fluoresc.

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The research in developing a single ingredient phosphor for white-light emission is progressively increasing. It is well known that the 4F9/2→ 6H13/2 (yellow) and 4F9/2→ 6H15/2 (blue) transitions of Dy3+ ions give near-white light emission. The white light emission of the Dy3+ ions can be enhanced by improving the crystallinity of the host phosphor via co-doping of transition metal ions. In this paper, we report a significant improvement in the white light emission of Dy3+ doped CaMoO4 by co-doping Zn2+ ions. The X ray diffraction pattern confirms the tetragonal phase of pure and doped CaMoO- 4 phosphor. The peak broadening and a red-shift in the absorption peak are observed by UV-Vis absorption analysis of Zn2+/Dy3+ doped CaMoO4. From Photoluminescence studies, we have observed that in Dy3+ doped CaMoO4, the 4% Dy3+ doped CaMoO4exhibits maximum emission. The Zn2+ ions are co-doped to further increase the luminescence intensity of CaMoO4:4%Dy3+ and the maximum luminescence is obtained for 0.25% Zn2+ concentration. Two prominent emission peaks centered at 484 nm and 574 nm related to transitionsT⃗he 4F9/2→ 6H13/2 4F9/2 6H15/2 and 4F9/2→ 6H13/2 of Dy3+ ion are observed for Dy3+ doped phosphor.transition is the forced electric dipole transition which is affected by its chemicalenvironment. After Zn2+ co-doping, the 4F9/2→ 6H13/2 transition is affected due to a change in asymmetricity around the Dy3+ ions. The 0.25% co-doping of Zn2+ gives 34% enhancement in luminescence emission of 4% Dy3+ doped CaMoO4. As a result, the CIE coordinates and color purity of the 0.25% Zn2+ co-doped CaMoO4:4Dy3+ show improvement in the overall white light emission. We have shown that with Zn2+ co-doping, the non-radiative relaxations are reduced which results in improved white light emission of Dy3+ions.

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Section: Resultsmentioning

confidence: 99%

Improvement in white light emission of Dy³⁺ doped CaMoO₄ via Zn²⁺ co-doping

Dixit¹,

Pandey²,

Chauhan³

et al. 2022

Methods Appl. Fluoresc.

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“…XPS analysis of C, O, and Na was conducted, and it was verified that no significant changes took place, except for the emergence of new peaks for Na, which is ascribed to Na− O bonds. 25,26 The introduction of SDBS not only resulted in morphological transitions but also significantly altered hydrophobic/hydrophilic properties. These dynamic changes can be visually observed macroscopically by simply injecting a drop of water onto the conventional PI sponge and prepared sPI sponges (Figure 1g,h).…”

Section: Resultsmentioning

confidence: 99%

Ultralight, Structurally Stable Electrospun Sponges with Tailored Hydrophilicity as a Novel Material Platform

Cheong

Mafi

Benker

et al. 2020

ACS Appl. Mater. Interfaces

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Sponges based on short electrospun fibers have received significant attention due to their ultrahigh porosity, lightweight, and multifunctional characteristics. In particular, polyimide (PI) sponges have been researched due to their exceptional mechanical properties and thermal stability. Nevertheless, a number of sponges, including PI, are usually hydrophobic and synthesized in toxic, nonwater solvents (e.g., 1,4-dioxane). Conversely, hydrophilic sponges disintegrate upon contact with water. Here, we suggest a new strategy to fabricate PI sponges in water by introducing a suitable surfactant, sodium dodecylbenzenesulfonate (SDBS) (sPI sponges). With less than 1 wt % of SDBS with respect to PI short fibers, they can be homogeneously dispersed in water and mixed well with poly(amic acid) (PAA) solution. The synthesized sponge, depending on the concentration of SDBS, showed hydrophilic properties and substantial water uptake above 5000%. The hydrophilic properties of the sponges, which are not common, and the preparation from aqueous solution introduce new research opportunities. Such hydrophilic sponges are particularly special because they do not swell in contact with water, which makes them dimensionally stable. The methods presented here can serve as a milestone for the future development of various kinds of hydrophilic sponges applied for various applications, ranging from tissue engineering to oil/water separation.

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“…Therefore, the P-O-K, P-O-Ca (or partially Ce-O and Dy-O), P-O-Zn, and P-O-P (or PvO double bond) structural bonds resulted in the O1, O2, O3, and O4 peaks. 42 The Ca 2p spectrum consists of two fitted peaks at 350.92 eV (Ca 2p 1/2 ) and 347.35 eV (Ca 2p 3/2 ). The binding energy difference (Δ = 3.57 eV) of the two peaks is very similar to the standard value (3.60 eV), verifying the +2 valence state of the Ca ion.…”

Section: Paper Dalton Transactionsmentioning

confidence: 99%

Highly thermostable white-emitting Ca₉ZnK(PO₄)₇:Ce³⁺,Dy³⁺ single-phase phosphor with tunable photoluminescence and energy transfer

et al. 2022

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X-ray photoelectron spectroscopy and optical analysis of pure white light emitting Dy3+ and Mn2+ codoped Na3Y(PO4)2 phosphors for solid-state lighting

Cited by 42 publications

References 45 publications

Improvement in white light emission of Dy³⁺ doped CaMoO₄ via Zn²⁺ co-doping

Improvement in white light emission of Dy³⁺ doped CaMoO₄ via Zn²⁺ co-doping

Ultralight, Structurally Stable Electrospun Sponges with Tailored Hydrophilicity as a Novel Material Platform

Highly thermostable white-emitting Ca₉ZnK(PO₄)₇:Ce³⁺,Dy³⁺ single-phase phosphor with tunable photoluminescence and energy transfer

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X-ray photoelectron spectroscopy and optical analysis of pure white light emitting Dy3+ and Mn2+ codoped Na3Y(PO4)2 phosphors for solid-state lighting

Cited by 42 publications

References 45 publications

Improvement in white light emission of Dy3+ doped CaMoO4 via Zn2+ co-doping

Improvement in white light emission of Dy3+ doped CaMoO4 via Zn2+ co-doping

Ultralight, Structurally Stable Electrospun Sponges with Tailored Hydrophilicity as a Novel Material Platform

Highly thermostable white-emitting Ca9ZnK(PO4)7:Ce3+,Dy3+ single-phase phosphor with tunable photoluminescence and energy transfer

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Improvement in white light emission of Dy³⁺ doped CaMoO₄ via Zn²⁺ co-doping

Improvement in white light emission of Dy³⁺ doped CaMoO₄ via Zn²⁺ co-doping

Highly thermostable white-emitting Ca₉ZnK(PO₄)₇:Ce³⁺,Dy³⁺ single-phase phosphor with tunable photoluminescence and energy transfer