Eu2+-doped M2SiO4 (M = Ca, Ba) phosphors prepared by a rapid microwave-assisted sol–gel method: Phase formation and optical properties

Birkel, Alexander; DeCino, Nicholas A.; George, Nathan C.; Hazelton, Katherine A.; Hong, Byung‐Chul; Seshadri, Ram

doi:10.1016/j.solidstatesciences.2013.02.003

Cited by 29 publications

(16 citation statements)

References 26 publications

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“…Most of the mass loss occurs up to 600 C while very little additional loss is seen when increasing the temperature to 1000 C. The TGA curve contains a total of two significant weight loss stages; one located between room temperature and below 200 C, where the corresponding DTA curve reveals an endothermic peak, and another weight loss between 200 C and~650 C, where the DTA shows several exothermic peaks. These results are comparable to our earlier studies on the solegel preparation of orthosilicates [32]. In short, the weight loss occurring below 200 C is due to the desorption of residual water and surface agents in the dried gel.…”

Section: Resultssupporting

confidence: 90%

A single-phase full-color phosphor based on Ba 3 MgSi 2 O 8 co-activated with Eu 2+ , Tb 3+ , and Mn 2+

Birkel

DeCino

Cozzan

et al. 2015

Solid State Sciences

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a b s t r a c tWe present a rapid and energy-efficient microwave-assisted approach to prepare a single-phase fullcolor phosphor based on Ba 3 MgSi 2 O 8 . The samples were prepared using a citric acid based solegel preparation pathway with a microwave-assisted heating step, which reduces the time required for the final heat treatment to less than 30 min. Thermogravimetric analysis was utilized to optimize the solution-based preparation prior to microwave heating. The structural properties of the obtained luminescent materials have been thoroughly investigated by means of X-ray powder diffraction and Rietveld analyses. To study the optical behavior, the excitation and emission spectra were recorded. Fullcolor emission is achieved using Eu 2þ (blue), Tb 3þ (green), and Mn 2þ (red) as the activator ions. The thermally robust emission was investigated using temperature-dependent luminescence spectroscopy. The energy-transfer processes within the samples were studied using time-dependent spectroscopy, and the quantum yield of this true color phosphor as a function of the composition was determined.

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Section: Resultssupporting

confidence: 90%

A single-phase full-color phosphor based on Ba 3 MgSi 2 O 8 co-activated with Eu 2+ , Tb 3+ , and Mn 2+

Birkel

DeCino

Cozzan

et al. 2015

Solid State Sciences

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“…In the conventional preparation of phosphors for white lighting applications, the combination of the extremely high temperatures necessary to react refractory starting materials The assisted-microwave method offers a degree of morphological control of complex oxides when combined with a sol-gel approach. The dried gel (process is described by Birkel et al 43 and Misch et al 44 ), may be ground and microwave-heated to obtain a final product in just a few minutes of heating, rather than hours or days by conventional (Ln = Y, La) 44 , where surface area plays an important role. The phase evolution of the gel, for which details of the preparation are provided in the reference, is evaluated using X-ray diffraction at different intervals.…”

Section: Complex Oxidesmentioning

confidence: 99%

Protocols for High Temperature Assisted-Microwave Preparation of Inorganic Compounds

et al. 2019

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Assisted microwave heating involves the use of a susceptor to initially heat up reactants in a microwave reaction. Once hot, the reactants themselves become directly susceptible to microwave heating, and interdiffuse to form products. Assisted-microwave methods are appealing for a wide variety of high-temperature solid-state reactions, reaching reaction temperatures of 1500 • C and more. Among the many advantages are that the direct volumetric heating associated with microwaves allows for rapid reaction times while employing significantly less energy than conventional furnace-based preparation. Shorter reaction times and selective heating permit volatile reactants to be incorporated stoichiometrically in the product. Undesirable reactions with containers or enclosures are also minimized. The morphology of powders obtained through microwave reactions are also more uniform and comprise smaller particles than obtained conventionally. This Methods/Protocols article is presented as a user manual for carrying out assisted-microwave preparation of bulk complex oxides in air or reducing atmospheres, sol-gel based processing of complex oxides, air sensitive intermetallics, and transition metal chalcogenides.

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“…There are various methods to prepare these rare earth doped compounds like solid state reaction, combustion reaction, hydrothermal method, precipitation method, micro emulsion method, microwave method, sol gel synthesis method [25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Luminescence Properties of CaAl₂O₄:Eu³⁺, Gd³⁺ Phosphors Synthesized by Combustion Synthesis Method

et al. 2017

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CaAl2O4:Eu3+ (1 mol.%) co-doped with varying concentration of Gd 3+ (1, 2, 5, and 10 mol.%) were prepared by combustion synthesis method at 600• C and further annealed at 1000• C. All the compositions were investigated for their structural and photoluminescence properties. It was observed that both states of europium i.e. Eu 3+ and Eu 2+ were present and ratio of these states changes on heating at 1000• C. The materials synthesized at 600• C showed high intense peak around 440 nm due to presence of Eu 2+ and less intense peaks in the red region which were due to presence of Eu 3+ . On annealing the compounds at 1000• C, intensity of peak around 440 nm decreases and intensity of peaks in the red region increases significantly. The 5 D0 → 7 F3 transition due to Eu 3+ at 657 nm appears as the highest intensity peak. All co-doped samples annealed at 1000• C showed the higher intensity than the mono doped sample which is due to energy transfer from the Gd 3+ to Eu 3+ . The second rare-earth ion (Gd 3+ ) acts as sensitizer and enhances the photoluminescence intensity. The X-ray diffraction spectra reveal the monoclinic phase of CaAl2O4 in all the samples which showed that Eu 3+ and Gd 3+ do not change the crystalline structure of calcium aluminate.

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Eu2+-doped M2SiO4 (M = Ca, Ba) phosphors prepared by a rapid microwave-assisted sol–gel method: Phase formation and optical properties

Cited by 29 publications

References 26 publications

A single-phase full-color phosphor based on Ba 3 MgSi 2 O 8 co-activated with Eu 2+ , Tb 3+ , and Mn 2+

A single-phase full-color phosphor based on Ba 3 MgSi 2 O 8 co-activated with Eu 2+ , Tb 3+ , and Mn 2+

Protocols for High Temperature Assisted-Microwave Preparation of Inorganic Compounds

Luminescence Properties of CaAl₂O₄:Eu³⁺, Gd³⁺ Phosphors Synthesized by Combustion Synthesis Method

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Eu2+-doped M2SiO4 (M = Ca, Ba) phosphors prepared by a rapid microwave-assisted sol–gel method: Phase formation and optical properties

Cited by 29 publications

References 26 publications

A single-phase full-color phosphor based on Ba 3 MgSi 2 O 8 co-activated with Eu 2+ , Tb 3+ , and Mn 2+

A single-phase full-color phosphor based on Ba 3 MgSi 2 O 8 co-activated with Eu 2+ , Tb 3+ , and Mn 2+

Protocols for High Temperature Assisted-Microwave Preparation of Inorganic Compounds

Luminescence Properties of CaAl2O4:Eu3+, Gd3+ Phosphors Synthesized by Combustion Synthesis Method

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Luminescence Properties of CaAl₂O₄:Eu³⁺, Gd³⁺ Phosphors Synthesized by Combustion Synthesis Method