New insights in the structure–luminescence relationship of Eu:SrAl2O4

Cordoncillo, Eloísa; Julián‐López, Beatriz; Martínez, Marta; Sanjuán, M. L.; Escribano, P.

doi:10.1016/j.jallcom.2009.05.018

Cited by 43 publications

(50 citation statements)

References 17 publications

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“…The calculated lattice parameters were a = 8.42 ± 0.02 Å, b = 8.78 ± 0.03 Å, c = 5.18 ± 0.02 Å, and β = 93.3° ( V = 382.3 Å 3 ), which are very close to those reported by other authors . This result is similar to those observed in previous publications by using other synthesis procedures . It is important to note that the molten salt processing route was applied for the first time to obtain single‐phase, monoclinic SrAl 2 O 4 materials at 1,100 °C.…”

Section: Resultssupporting

confidence: 88%

Polarization‐resolved Raman modes of monoclinic SrAl₂O₄ ceramics

Dias

Moreira

2018

J Raman Spectroscopy

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SrAl2O4 materials were obtained by molten salt synthesis and sintered at high temperatures to produce a ceramic body suitable for polarization‐resolved Raman spectroscopy measurements. Optimized experimental conditions were employed to study the complex vibrational spectrum of these ceramics under polarized light. A reliable set of experimental bands was obtained: 69 Raman modes were in fact observed, out of the 81 bands foreseen for the stable monoclinic polymorph of the material, from which 38 could be assigned as totally symmetric A‐type modes, and 31 attributed as asymmetric B‐type ones. Significant differences between experimental data and theoretical predictions indicated that additional efforts are necessary to understand these two sets of vibrational information. The knowledge of the optical phonon features reported here can help to understand the exceptional luminescence properties of SrAl2O4 in its monoclinic phase.

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Section: Resultssupporting

confidence: 88%

Polarization‐resolved Raman modes of monoclinic SrAl₂O₄ ceramics

Dias

Moreira

2018

J Raman Spectroscopy

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“…However, this strategy requires a detailed study taking into account that the monoclinic polymorph is stable below 650°C, and there is no clear agreement on the emission of the hexagonal structure. 46,61 3.6. Reaction Mechanism Schematic Diagram.…”

Section: Corroborating Sral 2 O 4 Formation By Rt-xrdmentioning

confidence: 99%

Original Synthetic Route To Obtain a SrAl₂O₄ Phosphor by the Molten Salt Method: Insights into the Reaction Mechanism and Enhancement of the Persistent Luminescence

et al. 2015

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SrAl2O4:Eu(2+), Dy(3+) has been extensively studied for industrial applications in the luminescent materials field, because of its excellent persistent luminescence properties and chemical stability. Traditionally, this strontium aluminate material is synthesized in bulk form and/or fine powder by the classic solid-state method. Here, we report an original synthetic route, a molten salt assisted process, to obtain highly crystalline SrAl2O4 powder with nanometer-scale crystals. The main advantages of salt addition are the increase of the reaction rate and the significant reduction of the synthesis temperature because of much higher mobility of reactants in the liquid medium than in the solid-state method. In particular, the formation mechanism of SrAl2O4, the role of the salt, and the phase's evolution have been explored as a function of temperature and time. Phosphorescent powders based on SrAl2O4:Eu(2+), Dy(3+) with high crystallinity are obtained after 1 h treatment at 900 °C. This work could promote further interest in adopting the molten salt strategy to process high-crystallinity materials with enhanced luminescence to design technologically relevant phosphors.

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“…A higher metal-oxygen bond order, corresponding to a shorter bond distance, shifts the Raman bond to higher wave numbers. In order to complement XRD data, Raman spectroscopy has been used for determining the coexistence of monoclinic and hexagonal polymorphs in earlier reports [11]. Unfortunately there is a very limited literature on this topic.…”

Section: Raman Scatteringmentioning

confidence: 99%