Photoluminescence properties of sub-micron NaGd 1−x Eu x (WO 4 ) 2 red phosphor for solid state lightings application: Derived by different synthesis routes

Durairajan, A.; Kumar, Jitendra; Thangaraju, D.; Babu, S. Moorthy

doi:10.1016/j.spmi.2016.03.025

Cited by 28 publications

(18 citation statements)

References 42 publications

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“…Thus, the distance between neighboring Er 3+ atoms in NaLa(WO 4 ) 2 lattice should reach a critical value of R c =9.61 Å to have effective energy transfer for intense UC emission. The observed x c in our materials is higher compared to the similar kind of materials reported in the literature [20,22] . The optimized composition of NaLa 0.865 Yb 0.1 Er 0.035 (WO 4 ) 2 has been utilized for all further optical and biological experiments.…”

Section: Resultsmentioning

confidence: 65%

“…The observed x c in our materials is higher compared to the similar kind of materials reported in the literature. [20,22] The optimized composition of NaLa 0.865 Yb 0.1 Er 0.035 (WO 4 ) 2 has been utilized for all further optical and biological experiments. In addition, the effect of excitation pump power density on the UCB emission intensity showed linear dependency up to 17.6 W cm À 2 (Figure S9) beyond which intensity saturates signifying an optimum power density as seen in halide hosts.…”

Section: Room Temperature Upconversion Optical Studiesmentioning

confidence: 99%

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Synthesis, Neutron Diffraction, and DFT Studies of NaLa(WO₄)₂: Yb³⁺/Er³⁺; NIR Induced Green Fluorescent Bifunctional Probes for In Vitro Cell Imaging and Solid State Lighting

et al. 2022

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We report the synthesis, systematic crystal structure, and upconversion (UC) emission in bulk and nanomaterials of NaLa(WO4)2: Yb3+/Er3+. The disordered NaLa(WO4)2 matrix has been considered as the UC host and host lattice dynamics were investigated using DFT, and neutron diffraction studies. The presence of phonons at the cut‐off frequency of ∼912 cm−1 is revealed by DFT analysis which is further confirmed by room temperature Raman studies. The optimized concentration of NaLa0.865Er0.035Yb0.1(WO4)2 is referred to as UCB and UCN with respect to particle size derived from a facile solvothermal method. Interestingly, high‐resolution microscopy studies uncovered the existence of high‐density edge dislocations in UCN nanomaterials leading to enhanced phonon scattering. Both UCB and UCN materials have shown pump power‐dependent intense UC green emission upon 980 nm laser irradiation. In addition, we have also demonstrated an excellent non‐toxicity of UCB and UCN towards Escherichia coli, Staphylococcus aureus, Candida albicans, and mammalian HeLa cell lines followed by the potential use of nanomaterials for in vitro cell imaging. Thus, the combined neutron diffraction, DFT, microscopy, and spectroscopic analysis collectively resulted in the right structure‐property relationship in these biocompatible UC green fluorescent bifunctional NaLa(WO4)2 materials.

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Section: Resultsmentioning

confidence: 65%

Section: Room Temperature Upconversion Optical Studiesmentioning

confidence: 99%

Synthesis, Neutron Diffraction, and DFT Studies of NaLa(WO₄)₂: Yb³⁺/Er³⁺; NIR Induced Green Fluorescent Bifunctional Probes for In Vitro Cell Imaging and Solid State Lighting

et al. 2022

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“…Такая же величина содержания европия x = 0.7 приводится в работе, посвященной катион-дефицитной разновидности натрий-гадолиниевого молибдата Na 2 Gd 4 (MoO 4 ) 7 [22]. Близкое значение x = 0.6 получено в работе, где исследовался европийсодержащий вольфрамовый аналог NaGd(WO 4 ) 2 [44]. Высокие значения и близкие по величине содержания европия, соответствующие началу концентрационного тушения приводятся и для других изоструктурных двойных молибдатов как стехиометрического, так и катион-дефицитных составов [8,22].…”

Section: результаты и их обсуждениеunclassified

“…Концентрационное тушение в европий содержащих твердых растворах связано с взаимодействием активаторных центров между собой. В ряде работ рассматривались различные механизмы тушения европия в двойных молибдатах и вольфраматах (см., например, [22,43,44,45]). Среди возможных механизмов тушения называются реабсорбция излучения, обменное взаимодействие и мультиполь-мультипольное взаимодействие между соседними ионами европия.…”

Section: результаты и их обсуждениеunclassified

“…При этом, определенный вклад в тушение люминесценции может вносить также миграция энергии по близко расположенным активаторным ионам, приводя к пространственному распространению возбуждения, что увеличивает вероятность тушения на примесях. Анализ, проведенный в работах [44,45], позволил авторам сделать вывод о том, что наиболее вероятным механизмом тушения европия в двойных молибдатах и вольфраматах является электростатическое мультиполь-мультипольное взаимодействие.…”

Section: результаты и их обсуждениеunclassified

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Моделирование твердых растворов NaGd(MoO-=SUB=-4-=/SUB=-)-=SUB=-2-=/SUB=-- NaEu(MoO-=SUB=-4-=/SUB=-)-=SUB=-2-=/SUB=- и Na-=SUB=-2-=/SUB=-Gd-=SUB=-4-=/SUB=-(MoO-=SUB=-4-=/SUB=-)-=SUB=-7-=/SUB=--Na-=SUB=-2-=/SUB=-Eu-=SUB=-4-=/SUB=-(MoO-=SUB=-4-=/SUB=-)-=SUB=-7-=/SUB=- методом межатомных потенциалов

Dudnikova¹,

Zharikov²,

Eremin³

2019

Физика Твердого Тела

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Simulation of the solid solutions in the system of double sodium–gadolinium and sodium–europium molybdates, which are promising matrices for solid state lasers and phosphors has been carried out by the method of interatomic potentials. Two types of solid solutions have been studied, one of which contains finite components corresponding to the stoichiometric NaGd(MoO_4)_2–NaEu(MoO_4)_2 compositions with statistical distribution of cations in the crystal lattice. Another object is a cation-deficient Na_2Gd_4(MoO_4)_7–Na_2Eu_4(MoO_4)_7 system, in which we have examined the variants of statistical distribution and partial ordering of cations over structural positions. Atomistic simulation has been performed using the GULP 4.0.1 software package (General Utility Lattice Program). It is shown that when we pass from sodium-gadolinium molybdate to sodium-europium molybdate, both of stoichiometric and cation-deficient compositions, an increase in the unit cell volume is observed, while the density of the crystal, the energy of interatomic interactions in the structure, the vibrational entropy and the heat capacity decrease along with increasing europium content. The energy of interatomic interactions in the structure for cation-deficient solid solutions is less than for stoichiometric ones. Other aforementioned characteristics for cation-deficient solid solutions have greater values than for stoichiometric ones. The role of cluster europium centers in concentration quenching in NaGd(MoO_4)_2–NaEu(MoO_4)_2 solid solutions has been examined.

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Magnetic and electric characterizations of sol–gel-derived NaFe(WO4)2 rods

et al. 2018

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Photoluminescence properties of sub-micron NaGd 1−x Eu x (WO 4 ) 2 red phosphor for solid state lightings application: Derived by different synthesis routes

Cited by 28 publications

References 42 publications

Synthesis, Neutron Diffraction, and DFT Studies of NaLa(WO₄)₂: Yb³⁺/Er³⁺; NIR Induced Green Fluorescent Bifunctional Probes for In Vitro Cell Imaging and Solid State Lighting

Synthesis, Neutron Diffraction, and DFT Studies of NaLa(WO₄)₂: Yb³⁺/Er³⁺; NIR Induced Green Fluorescent Bifunctional Probes for In Vitro Cell Imaging and Solid State Lighting

Magnetic and electric characterizations of sol–gel-derived NaFe(WO4)2 rods

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Photoluminescence properties of sub-micron NaGd 1−x Eu x (WO 4 ) 2 red phosphor for solid state lightings application: Derived by different synthesis routes

Cited by 28 publications

References 42 publications

Synthesis, Neutron Diffraction, and DFT Studies of NaLa(WO4)2: Yb3+/Er3+; NIR Induced Green Fluorescent Bifunctional Probes for In Vitro Cell Imaging and Solid State Lighting

Synthesis, Neutron Diffraction, and DFT Studies of NaLa(WO4)2: Yb3+/Er3+; NIR Induced Green Fluorescent Bifunctional Probes for In Vitro Cell Imaging and Solid State Lighting

Magnetic and electric characterizations of sol–gel-derived NaFe(WO4)2 rods

Contact Info

Product

Resources

About

Synthesis, Neutron Diffraction, and DFT Studies of NaLa(WO₄)₂: Yb³⁺/Er³⁺; NIR Induced Green Fluorescent Bifunctional Probes for In Vitro Cell Imaging and Solid State Lighting

Synthesis, Neutron Diffraction, and DFT Studies of NaLa(WO₄)₂: Yb³⁺/Er³⁺; NIR Induced Green Fluorescent Bifunctional Probes for In Vitro Cell Imaging and Solid State Lighting