Synthesis and spectral characterization of Sr4Al14O25:Eu2+/Dy3+ blue–green phosphorous powders by sol–gel method

Demirci, Selim; Gültekin, Serdar; Akalin, Salih Alper; Öter, Özlem; Ertekin, Kadriye; Çelik, Erdal

doi:10.1016/j.mssp.2014.12.066

Cited by 14 publications

(2 citation statements)

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“…One compound which has received tremendous attention in phosphorescent display materials and as a thermally stable catalyst support is a rare-earth doped phosphor [26,27]. Precisely, strontium aluminate phosphor materials such as Sr 4 Al 14 O 25 :Eu,Dy [26,28,29] and SrAl 2 O 4 :Eu,Dy produce an aesthetic visible light (blue or green, respectively) after UV-light excitation [30]. Recent studies revealed that solution combustion method is a robust method for synthesizing strontium aluminate phosphor with nanoparticle size distribution [31].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Properties of g-C3N4–Supported on the SrAl2O4:Eu,Dy/SiO2

Mavengere

Kim

2020

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Graphitic carbon nitride (g-C3N4) was supported on SrAl2O4:Eu,Dy-SiO2 by a colloidal-sol coating method to improve its light absorption property. Transmission electron microscopy (TEM) revealed that the nanoparticles of g-C3N4 were coated on sub-micron phosphor particles and nanoscale surface roughness was imparted by the SiO2-binder. Photoluminescence (PL) spectrum of the g-C3N4 supported on SrAl2O4:Eu,Dy exhibited a broadband emission from 400 to 650 nm. Increasing silica-binder in the g-C3N4/SrAl2O4:Eu,Dy composites suppressed the PL emission peak at 525 nm for SrAl2O4:Eu,Dy. Photocatalytic degradation activity was evaluated with 5 ppm methylene blue (MB) solutions under germicidal ultraviolet (UV) and visible (Vis) solar light illuminations. The UV/Vis photocatalytic efficiency was improved by supporting g-C3N4 on the SrAl2O4:Eu,Dy phosphor and with the addition of SiO2 as a binder. In addition, low silica addition effectively improved the adhesiveness of the g-C3N4 coating on the SrAl2O4:Eu,Dy surface. Recyclability tests of photocatalysis for the SrAl2O4:Eu,Dy-0.01M SiO2/50wt% g-C3N4 composites exhibited a remarkable stability by maintaining the degradation efficiencies above 90% in four cycles. Therefore, the composite of g-C3N4-supported SrAl2O4:Eu,Dy-SiO2 is a prospective photocatalyst activating under UV/Vis light irradiation for the elimination of environmental pollutants.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Properties of g-C3N4–Supported on the SrAl2O4:Eu,Dy/SiO2

Mavengere

Kim

2020

Coatings

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“…For consolidation, spark plasma sintering [24], hot and cold pressing [25,26], hot and cold isostatic pressing [27,28], and ceramic preparation technique [4] have been commonly used. Among these methods, sol-gel method is a chemical process to obtain TE powders, which is easy, has lower reaction temperatures, leads homogeneous mixtures of precursors, and has low process cost compared to the other synthesis methods [29,30]. To consolidate the powder samples, high gas pressure can be applied isostatically to all surfaces of a sample at high temperatures by hot isostatic pressing (HIP) [28].…”

Section: Introductionmentioning

confidence: 99%