Photoluminescence Properties of (Ba&lt;sub&gt;1-(x+y)&lt;/sub&gt;Sr&lt;sub&gt;x&lt;/sub&gt;Eu&lt;sub&gt;y&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;Si&lt;sub&gt;6&lt;/sub&gt;O&lt;sub&gt;12&lt;/sub&gt;N&lt;sub&gt;2&lt;/sub&gt; Phosphors for White LED Applications

Sarda, Narendra G.; Fujigaki, Hiroshi; Ogita, Yuma; Chan, Andrew; Murai, Kei‐ichiro; Waterhouse, Geoffrey I. N.; Moriga, Toshihiro

doi:10.4028/www.scientific.net/jnanor.36.1

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…Both samples are much similar to large particle size and irregular morphologies. This result is also in line with the synthetic experiments of Moriga et al, who reported that a higher Si/Ba ratio was beneficial for the synthesis of Ba 3 Si 6 O 12 N 2 and (Ba 1–( x + y ) Sr x Eu y ) 2 Si 6 O 12 N 2 phases. , …”

Section: Resultssupporting

confidence: 91%

Eu²⁺-Activated Phase-Pure Oxonitridosilicate Phosphor in a Ba–Si–O–N System via Facile Silicate-Assisted Routes Designed by First-Principles Thermodynamic Simulation

Yun

Kim

et al. 2016

Inorg. Chem.

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Eu(2+)-activated single phase Ba(2+)-oxonitridosilicate phosphors were prepared under a mild synthetic condition via silicate precursors, and their luminescent properties were investigated. Both the preferred oxonitridosilicate formation as for the available host compounds and thermodynamic stability within the Ba-Si-O-N system were elucidated in detail by the theoretical simulation based on the first-principles density functional theory. Those results can visualize the optimum synthetic conditions for Eu(2+)-activated highly luminescent Ba(2+)-oxonitridosilicates, especially Ba3Si6O12N2, as promising conversion phosphors for white LEDs, including Ba3Si6O9N4 and BaSi2O2N2 phases. To prove the simulated design rule, we synthesized the Ba3Si6O12N2:Eu(2+) phosphor using various silicate precursors, Ba2Si4O10, Ba2Si3O8, and BaSiO3, in a carbothermal reduction ambient and finally succeeded in obtaining a phase of pure highly luminescent oxonitridosilicate phosphor without using any solid-state nitride addition and/or high pressure synthetic procedures. Our study provides useful guidelines for robust synthetic procedures for developing thermally stable rare-earth-ion activated oxonitridosilicate phosphors and an established simulation method that can be effectively applied to other multigas systems.

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Section: Resultssupporting

confidence: 91%

Eu²⁺-Activated Phase-Pure Oxonitridosilicate Phosphor in a Ba–Si–O–N System via Facile Silicate-Assisted Routes Designed by First-Principles Thermodynamic Simulation

Yun

Kim

et al. 2016

Inorg. Chem.

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“…The main difficulty when tackling this question is that a change of a compound's structure is usually linked to a change in its composition and vice versa. The influence of the composition can be evaluated by studying the effect of a partial substitution of one or more of the constituting elements in a system, which tolerates this substitution without undergoing structural change [17][18][19][20][21][22][23]. Much rarer is the case of a host structure which exhibits polymorphism, like e.g.…”

Section: Introductionmentioning

confidence: 99%

Polymorphs and derivates of Sr₂LiAlO₄:Eu²⁺

Hoerder

Peschke

Wurst

et al. 2019

Zeitschrift Für Naturforschung B

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Recently, Wang et al. (Z. Wang, J. Ha, Y. H. Kim, W. B. Im, J. McKittrick, S. P. Ong, Joule2018, 2, 914–926) predicted and discovered Sr2LiAlO4, a quaternary compound with a layered structure crystallizing in the monoclinic space group P21/m, and they refined the structure from PXRD data. Upon partially substituting strontium with europium, the substance exhibits a yellow broadband luminescence consisting of two overlapping emission bands. In this paper, the crystal structure of Sr2LiAlO4 is confirmed by additional SC-XRD measurements and a newly discovered polymorph of Sr2LiAlO4 is presented crystallizing in the orthorhombic space group Cmcm. When Eu2+ is incorporated, this polymorph exhibits only one of the emission bands present in the P21/m-polymorph. Additionally, two substitutional variants of Sr2LiAlO4 are presented along with their luminescence properties upon incorporating Eu2+. One with a partial substitution of strontium for barium, leading to a structure in space group Pnma, and one with a partial substitution of oxygen for nitrogen, exhibiting the structure in space group Cmcm. The structure-property relationships in the above mentioned compounds are discussed with regard to their luminescence performance.

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“…It is reported that partially replacing Ba 2+ ( r Ba2+ = 149 pm) ions in the host lattice with smaller Sr 2+ ( r Sr2+ = 132 pm) ions can lead to unit cell volume contraction. As a consequence, the local coordination environment around Eu 2+ ions is modified, and the corresponding luminescence properties are improved . On the basis of this consideration, we prepared a series of (Ba, Sr) 3 (Al, Si) 6 (O, N) 15 :Eu 2+ samples and studied the structure and luminescence properties in detail.…”

Section: Resultsmentioning

confidence: 99%

Influence of Anion/Cation Substitution (Sr²⁺ → Ba²⁺, Al³⁺ → Si⁴⁺, N^3– → O^2–) on Phase Transformation and Luminescence Properties of Ba₃Si₆O₁₅:Eu²⁺ Phosphors

et al. 2017

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A series of promising cyan, green, and yellow emission (Ba, Sr) 3 (Si, Al) 6 (O, N) 15 :Eu 2+ phosphors were synthesized by a Pechini-type sol−gel ammonolysis method. Variations in luminescence properties and crystal structure caused by the modification of phosphor composition were studied in detail. The prefired temperatures of the precursors play a key role in the process of forming the final products. Under UV light excitation, the as-prepared Ba 3 Si 6 O 15 :Eu 2+ phosphor presents a strong cyan emission located at 498 nm. Moreover, the as-prepared oxynitride phosphors, Eu 2+activated (Ba 1−y Sr y ) 3 Si 6−x Al x O 15−μ N δ (x = 0−1.2, y = 0−0.6), display a broader excitation band covering the entire visible region. Under blue light excitation, Ba 3 Si 6−x Al x O 15−μ N δ :Eu 2+ phosphors show a intense and narrow green emission at 520 nm, and the luminescent intensity can be enhanced by increasing Al content within a certain range. However, (Ba 1−y Sr y ) 3 Si 6 O 15−μ N δ :Eu 2+ phosphors exhibit green (520 nm) to yellow (554 nm) emission with increasing Sr content. Unexpectedly, Eu 2+ doped Ba 3 Si 6 O 9 N 4 -type Ba 3 Si 6 O 15−μ N δ −1300 °C phosphor exhibits a bluish green emission and strong thermal quenching behavior. The (Ba 1−y Sr y ) 3 Si 6−x Al x O 15−μ N δ :Eu 2+ phosphors exhibit a small thermal quenching, and the quantum yields measured under 460 nm excitation could reach up to 89% for green Ba 3 Si 6−x Al x O 15−μ N δ :Eu 2+ phosphor and 71% for yellow (Ba 1−y Sr y ) 3 Si 6x O 15−μ N δ :Eu 2+ phosphor. White LEDs with tunable color temperature and higher color rendering index were fabricated by combining the prepared cyan Ba 3 Si 6 O 15 :Eu 2+ /green Ba 2.91 Eu 0.09 Si 6−x Al x O 15−μ N δ (x = 0.06)/yellow (Ba 0.97−y Sr y ) 3 Eu 0.09 Si 6 O 15−μ N δ (y = 0.4) phosphor and a red phosphor with a UV or blue LED chip, indicating that they are promising phosphors for white LEDs.

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Photoluminescence Properties of (Ba<sub>1-(x+y)</sub>Sr<sub>x</sub>Eu<sub>y</sub>)<sub>2</sub>Si<sub>6</sub>O<sub>12</sub>N<sub>2</sub> Phosphors for White LED Applications

Cited by 7 publications

References 9 publications

Eu²⁺-Activated Phase-Pure Oxonitridosilicate Phosphor in a Ba–Si–O–N System via Facile Silicate-Assisted Routes Designed by First-Principles Thermodynamic Simulation

Eu²⁺-Activated Phase-Pure Oxonitridosilicate Phosphor in a Ba–Si–O–N System via Facile Silicate-Assisted Routes Designed by First-Principles Thermodynamic Simulation

Polymorphs and derivates of Sr₂LiAlO₄:Eu²⁺

Influence of Anion/Cation Substitution (Sr²⁺ → Ba²⁺, Al³⁺ → Si⁴⁺, N^3– → O^2–) on Phase Transformation and Luminescence Properties of Ba₃Si₆O₁₅:Eu²⁺ Phosphors

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Photoluminescence Properties of (Ba<sub>1-(x+y)</sub>Sr<sub>x</sub>Eu<sub>y</sub>)<sub>2</sub>Si<sub>6</sub>O<sub>12</sub>N<sub>2</sub> Phosphors for White LED Applications

Cited by 7 publications

References 9 publications

Eu2+-Activated Phase-Pure Oxonitridosilicate Phosphor in a Ba–Si–O–N System via Facile Silicate-Assisted Routes Designed by First-Principles Thermodynamic Simulation

Eu2+-Activated Phase-Pure Oxonitridosilicate Phosphor in a Ba–Si–O–N System via Facile Silicate-Assisted Routes Designed by First-Principles Thermodynamic Simulation

Polymorphs and derivates of Sr2LiAlO4:Eu2+

Influence of Anion/Cation Substitution (Sr2+ → Ba2+, Al3+ → Si4+, N3– → O2–) on Phase Transformation and Luminescence Properties of Ba3Si6O15:Eu2+ Phosphors

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Eu²⁺-Activated Phase-Pure Oxonitridosilicate Phosphor in a Ba–Si–O–N System via Facile Silicate-Assisted Routes Designed by First-Principles Thermodynamic Simulation

Eu²⁺-Activated Phase-Pure Oxonitridosilicate Phosphor in a Ba–Si–O–N System via Facile Silicate-Assisted Routes Designed by First-Principles Thermodynamic Simulation

Polymorphs and derivates of Sr₂LiAlO₄:Eu²⁺

Influence of Anion/Cation Substitution (Sr²⁺ → Ba²⁺, Al³⁺ → Si⁴⁺, N^3– → O^2–) on Phase Transformation and Luminescence Properties of Ba₃Si₆O₁₅:Eu²⁺ Phosphors