Red-emitting  BaAl2O4:Eu3+ synthesized via Pechini and sol–gel routes: a comparison of luminescence and structure

Oliveira, Nagyla A.; Bispo‐Jr, Airton G.; Lima, Sergio A. M.; Pires, Ana Maria

doi:10.1007/s10853-021-06633-3

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“…Photoluminescent materials based on rare earth elements have been attractive for novel fluorescent probes, effective spectral converters for solar cells, , used in an anticounterfeiting application, optical sensors for oxygen detection, and used in solid-state lighting, ,− general fluorescent lamps, energy-saving lamps, and white light-emitting diodes (W-LEDs). − W-LEDs are the next-generation light source because of their high luminous efficiency, long lifetime, high thermal stability, , absence of pollution, ,, and low price. , For this reason, W-LEDs are a prospective replacement for conventional light sources. , Nowadays, commercial white LEDs available in the market are produced by combining a blue LED chip with yellow (YAG:Ce 3+ ) phosphors. Regrettably, this combination lacks a red component, rendering it poor quality for indoor lighting due to its high correlated color temperature (CCT > 6000 K) and low color rendering index (CRI, Ra < 80).…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Characterization of the Hybrid Molybdate–Tungstate Materials for Solid-State Lighting

Czajka,

Szczeszak

2023

J. Phys. Chem. C

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A series of trivalent europium-and samarium-doped calcium molybdate−tungstate phosphors were synthesized via the high-temperature solid-state reaction. The composition of the light-emitting materials was planned to consider different matrix content of Mo/W and various concentrations of dopant ions (Eu 3+ /Sm 3+ ) as the inorganic phosphors with tunable visible emission. X-ray powder diffractograms proved the formation of pure and highly crystalline tetragonal crystals with space group I4 1 / a. Images from a scanning electron microscope enable an analysis of the surface morphology of the microparticles and also functionalized polymer materials. The series of phosphors exhibit strong emission in the visible region at 617 nm, corresponding to the electric dipole transition of 5 D 0 → 7 F 2 of Eu 3+ and 646 nm assigned to the 5 D 5/2 → 6 H 9/2 transition typical for Sm 3+ . The emission intensity of CaMoWO 4 :Eu 3+ /Sm 3+ is tuned by changing the concentration of the Sm 3+ dopant, and 1931 Commission International de I'Eclairage (CIE) chromaticity coordinates showed the emission colors in the reddish-orange region under an excitation of 300 nm and in the red range under both 393 and 404 nm wavelengths. The investigated compounds can be used as a potential commercial tunable phosphor for solid-state lighting applications. For this purpose, the luminescent material was placed into the poly(styrene-co-acrylonitrile) and checked for its functionality.

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