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La3+-activated BaZrO3 nanophosphors: A promising blue-light emitting material for optoelectronic application.

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Názov: La3+-activated BaZrO3 nanophosphors: A promising blue-light emitting material for optoelectronic application.
Autori: Abimalar, J.1,2 (AUTHOR), Adline Benila, S.1,2 (AUTHOR), Anslin Ferby, V.1,2 (AUTHOR) anslinferbyv@gmail.com
Zdroj: Ceramics International. Dec2025:Part B, Vol. 51 Issue 29, p60708-60723. 16p.
Predmety: *BARIUM zirconate, *OPTOELECTRONICS, *DIELECTRIC properties, *OPTICAL properties, *CHEMICAL synthesis, *DOPING agents (Chemistry), *PHOSPHORS, *PHOSPHORESCENCE
Abstrakt: In this work, we present the synthesis and detailed characterization of undoped and lanthanum (La3+) doped barium zirconate (BaZrO 3) nanophosphors, with different La3+ concentrations of 2, 5, and 10 mol%, prepared using the sol-gel auto-combustion method. The core objective is to develop high-performance La3+-activated BaZrO 3 nanophosphors exhibiting enhanced optical and dielectric functionalities for advanced optoelectronic applications. Although BaZrO 3 is widely recognized for its excellent thermal stability and dielectric behaviour, its potential as a host matrix for rare-earth (RE) doped luminescent materials remains insufficiently explored. To bridge this gap, we investigate the structural, optical, and dielectric properties of La3+-doped BaZrO 3 in detail. A comprehensive suite of analytical techniques was employed to examine the physicochemical attributes of the synthesized nanophosphors. X-ray diffraction (XRD) confirmed phase purity and revealed a reduction in crystallite size from 47 nm to 29 nm with increasing La3+ content. The vibrational properties and bonding environments were validated by Fourier-transform infrared (FTIR) and Raman spectroscopy. Surface morphology was studied via scanning electron microscopy (SEM), while elemental composition and uniformity were confirmed by energy-dispersive X-ray spectroscopy (EDAX). High-resolution transmission electron microscopy (HRTEM) further confirmed nanoscale particle size and moderate agglomeration. Dielectric and impedance spectroscopy revealed improved ionic conductivity and reduced bulk resistance with La3+ doping, indicating strong potential for use in solid-state electrolyte applications. Ultra Violet -Visible diffuse reflectance spectroscopy (UV–Vis DRS) showed a slight increase in bandgap energy from 3.64 eV to 3.70 eV, reflecting enhanced optical properties due to La3+ incorporation. Photoluminescence (PL) studies under UV excitation demonstrated four distinct emission peaks: 363 nm (UV), 404 nm, 448 nm (blue), and 494 nm (green). Among the compositions, the 10 mol% La3+-doped nanophosphors exhibited the highest colour purity of 96.25 %, emphasizing its potential for high-quality luminescent applications. The novelty of this study lies in the strategic incorporation of La3+ into the BaZrO 3 nanophosphors to concurrently enhance both luminescent and electrical properties, thereby extending the multifunctional applicability of this perovskite system. Overall, La3+-doped BaZrO 3 nanophosphors emerge as promising candidates for integration into next-generation optoelectronic devices, particularly in solid-state lighting and display technologies. [Display omitted] [ABSTRACT FROM AUTHOR]
Databáza: Academic Search Index
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Abstrakt:In this work, we present the synthesis and detailed characterization of undoped and lanthanum (La3+) doped barium zirconate (BaZrO 3) nanophosphors, with different La3+ concentrations of 2, 5, and 10 mol%, prepared using the sol-gel auto-combustion method. The core objective is to develop high-performance La3+-activated BaZrO 3 nanophosphors exhibiting enhanced optical and dielectric functionalities for advanced optoelectronic applications. Although BaZrO 3 is widely recognized for its excellent thermal stability and dielectric behaviour, its potential as a host matrix for rare-earth (RE) doped luminescent materials remains insufficiently explored. To bridge this gap, we investigate the structural, optical, and dielectric properties of La3+-doped BaZrO 3 in detail. A comprehensive suite of analytical techniques was employed to examine the physicochemical attributes of the synthesized nanophosphors. X-ray diffraction (XRD) confirmed phase purity and revealed a reduction in crystallite size from 47 nm to 29 nm with increasing La3+ content. The vibrational properties and bonding environments were validated by Fourier-transform infrared (FTIR) and Raman spectroscopy. Surface morphology was studied via scanning electron microscopy (SEM), while elemental composition and uniformity were confirmed by energy-dispersive X-ray spectroscopy (EDAX). High-resolution transmission electron microscopy (HRTEM) further confirmed nanoscale particle size and moderate agglomeration. Dielectric and impedance spectroscopy revealed improved ionic conductivity and reduced bulk resistance with La3+ doping, indicating strong potential for use in solid-state electrolyte applications. Ultra Violet -Visible diffuse reflectance spectroscopy (UV–Vis DRS) showed a slight increase in bandgap energy from 3.64 eV to 3.70 eV, reflecting enhanced optical properties due to La3+ incorporation. Photoluminescence (PL) studies under UV excitation demonstrated four distinct emission peaks: 363 nm (UV), 404 nm, 448 nm (blue), and 494 nm (green). Among the compositions, the 10 mol% La3+-doped nanophosphors exhibited the highest colour purity of 96.25 %, emphasizing its potential for high-quality luminescent applications. The novelty of this study lies in the strategic incorporation of La3+ into the BaZrO 3 nanophosphors to concurrently enhance both luminescent and electrical properties, thereby extending the multifunctional applicability of this perovskite system. Overall, La3+-doped BaZrO 3 nanophosphors emerge as promising candidates for integration into next-generation optoelectronic devices, particularly in solid-state lighting and display technologies. [Display omitted] [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2025.10.267