Na2BaMg(PO4)2: synthesis, crystal structure and europium photoluminescence properties

Boukhris, Amal; Hidouri, Mourad; Glorieux, Benoît; Amara, Mongi Ben

doi:10.1016/s1002-0721(12)60369-x

Cited by 18 publications

(19 citation statements)

References 22 publications

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“…It may be caused by the large size of the barium site (hBa-Oi = 2.923 Å) which can easily accommodate Eu 2+ leading to natural reduction of Eu 3+ . The large band at high energy (below 250 nm) is similar to those observed in the two Eu 3+ doped compounds Na 2 MMg(PO 4 ) 2 with M = Sr, Ba [10,11]. It is related to the localization of Eu 3+ in a low crystal field site.…”

Section: Photoluminescence Studysupporting

confidence: 75%

“…So, these spectra were all indexed in the same space group P 3m1 as Na 2 BaMg(PO 4 ) 2 (x = 0) [11]. The x = 0.4 composition was refined by the Rietveld method [13].…”

Section: X-ray Diffractionmentioning

confidence: 99%

“…The x = 0.4 composition was refined by the Rietveld method [13]. The initial model and the atomic coordinates are those obtained from the structural refinement of Na 2 BaMg(PO 4 ) 2 (x = 0) [11]. Crystal data are summarized in Table 1.…”

Section: X-ray Diffractionmentioning

confidence: 99%

“…Based on a systematic investigation of the Na 3 PO 4 -Mg 3 (PO 4 ) 2 -M 3 (PO 4 ) 2 (M = Sr, Ba) systems, we recently identified two new phosphate compounds: Na 2 SrMg(PO 4 ) 2 [10] and Na 2 BaMg(PO 4 ) 2 [11] adopting the glaserite-type structure with different symmetries. Their structures are characterized by an anionic framework built up by the stacking, along the [0 0 1] direction, of two kinds of alternating [MgP 2 O 8 4À ] 1 layers parallel to the (a, b) plane and consisting of corner-sharing MgO 6 octahedra and PO 4 tetrahedra.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

X-ray diffraction, 31P NMR and europium photoluminescence properties of the Na2Ba1−xSrxMg(PO4)2 system related to the glaserite type structure

Boukhris

Glorieux

Amara

2015

Journal of Molecular Structure

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Section: Photoluminescence Studysupporting

confidence: 75%

“…So, these spectra were all indexed in the same space group P 3m1 as Na 2 BaMg(PO 4 ) 2 (x = 0) [11]. The x = 0.4 composition was refined by the Rietveld method [13].…”

Section: X-ray Diffractionmentioning

confidence: 99%

Section: X-ray Diffractionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

X-ray diffraction, 31P NMR and europium photoluminescence properties of the Na2Ba1−xSrxMg(PO4)2 system related to the glaserite type structure

Boukhris

Glorieux

Amara

2015

Journal of Molecular Structure

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“…Ba 2+ is located at an independent position. Considering the Eu 3+ radius (1.17 Å) is similar to the Ba 2+ radius (1.35 Å), Eu 3+ can easily replace Ba 2+ within the crystal lattice [13,14]. Therefore, after Eu 3+ doping, it can replace Ba 2+ and not change the crystal structure.…”

Section: Methodsmentioning

confidence: 99%

Energy transfer mechanism and color-tunable luminescence properties of Eu3+-doped BaMg2V2O8 vanadate phosphors

Fang

Huang

et al. 2016

Chemical Physics Letters

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Enhancement of red emission and site analysis in Eu2+ doped new-type structure Ba3CaK(PO4)3 for plant growth white LEDs

Xiang

Zheng

Zhou

et al. 2019

Chemical Engineering Journal

171

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A novel compound Ba3CaK(PO4)3 (BCKP) with new-type structure was synthesized and its structure was determined by X-ray diffraction Rietveld refinement, in which crystal structure consists of Ba1O9, Ba2O12, Ba3O9, CaO8 and KO10 polyhedra, that's five cationic sites. As a phosphor host, Eu2+ doped BCKP emits cold white light with about 90% quantum efficiency (QE) through entering different cationic sites. Based on the results of refinement, three Eu2+ luminescence centers in sites Ca, Ba2 and K were clearly assigned in Eu2+ solely doped BCKP by the time-resolved emission spectra (TRES), Van Uitert equation, but the emissions of Eu2+ at Ba1 and Ba3 sites are not easy to be determined for the same coordination number (CN). According to their different spatial distribution of the coordinated atoms, the first-principles calculation was used to compute the d orbital splitting energy of Eu2+ ions in Ba1 and Ba3 sites to accurately distinguish the ambiguous luminescence centers. In order to meet the requirement of plant growth spectra, Mn2+ was introduced into BCKP: Eu2+ to enhance the red component of spectra, which not only perfectly match with the absorption spectra of carotenoid and chlorophyll-b, but also LEDs fabricated through combining 365 nm near ultraviolet (n-UV) chip with BCKP: Eu2+, Mn2+ phosphor exhibit excellent parameters including high color rendering index (Ra) (92), excellent correlated color temperature (CCT) (4486 K) and outstanding QE up to 65%. Results confirmed that BCKP: Eu2+/Mn2+ phosphor with great potential applications in white LEDs and plant growth. Response to Reviewers: Dear editor, We are pleasure to accept your decision and the reviewers' suggestion. We would like to thank the referees for providing us constructive and valuable queries in bettering our manuscript in the revision. According to the remaining questions of referees, we have answered those questions raised by the referees carefully, and necessary changes have been made in the text. For the received queries, the replies are given below, and the changes in the manuscript have been marked in italic red color letters to show clearly. Reviewers' comments: Reviewer #1: The authors response well to the reviewers' comments and I therefore recommend its publication in Chem. Eng. J. Answer to comments: Thanks for the reviewer's recognition of our answers. Reviewer #3: Compared with the original version, a significant amount of work has gone into the revision of this paper, which has improved it considerably. In my opinion, it is acceptable for publication at its present form. Answer to comments: Thanks for the reviewer's recognition of our answers. Reviewer #9: Question 1: The authors suggested that the results of BCKP structure refinement will convince readers in spite that Biso of cations were over 2 and those for oxygens were over 3. However, as a crystallographer, the suggested crystal structure was less than satisfactory. In addition, the authors discussed the emission properties of BCKP based on the insufficient structure. Answer:...

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Na2BaMg(PO4)2: synthesis, crystal structure and europium photoluminescence properties

Cited by 18 publications

References 22 publications

X-ray diffraction, 31P NMR and europium photoluminescence properties of the Na2Ba1−xSrxMg(PO4)2 system related to the glaserite type structure

X-ray diffraction, 31P NMR and europium photoluminescence properties of the Na2Ba1−xSrxMg(PO4)2 system related to the glaserite type structure

Energy transfer mechanism and color-tunable luminescence properties of Eu3+-doped BaMg2V2O8 vanadate phosphors

Enhancement of red emission and site analysis in Eu2+ doped new-type structure Ba3CaK(PO4)3 for plant growth white LEDs

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