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UV-Driven Luminescence and PAR Emission in SrCoO₃-Based Perovskites
Luminescencia inducida por radiación UV y emisión de PAR en perovskitas basadas en SrCoO₃
DOI:
https://doi.org/10.15446/mo.n73.125003Keywords:
Sol-gel, Perovskite, Fluorescence, Red emission, Visible spectra, Energy efficient, UV excitation (en)Sol-gel, Perovskita, Fluorescencia, Emisión roja, Espectros visibles, Eficiencia energética, Excitación UV (es)
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Abstract
Perovskites have garnered significant attention for applications such as microwave dielectric ceramics, solar cells, and luminescence. Recently, there has been growing interest in using perovskite materials to enhance optical properties in the visible spectrum for energy-efficient light sources. This study investigates the role of UV-dependent excitation in the emission spectra of the SrCoO3 perovskite synthesized by the sol-gel method. The synthesized sample was sintered at 900°C and then characterized using various techniques to analyze its structure and optical properties. X-Ray Diffraction (XRD) revealed two phases: one corresponding to SrCoO3 with a tetragonal structure and the other to SrCO3 with an orthorhombic structure. Fourier Transform Infrared Spectroscopy (FTIR) identified several bands at 560 cm-1, 697 cm-1, and 854 cm-1, which are attributed to asymmetric stretching vibrations of Co3+, anti-symmetric vibrations of Sr-O, and twisting vibrations of the carbonate ion. Morphological analysis conducted via Field Emission Scanning Electron Microscopy (FESEM) revealed two distinct shapes: spherical for SrCoO3 and rod-shaped for SrCO3. UV absorption spectra were due to the inter-band transition of 4A2 (4F) to 4T1 (4P) Co2+ ions. Visible broad emission spectra were observed using fluorescence under various UV excitations at wavelengths of 220 nm, 280 nm, 360 nm, 390 nm, 435 nm, and 500 nm. The study revealed that the prepared material has excellent spectroscopic properties and can be explored for display devices.
Las perovskitas han despertado gran interés por sus aplicaciones en cerámicas dieléctricas para microondas, celdas solares y luminiscencia. Recientemente, ha aumentado el interés en el uso de materiales de perovskita para mejorar las propiedades ópticas en el espectro visible, con miras al desarrollo de fuentes de luz energéticamente eficientes. Este estudio investiga el papel de la excitación dependiente de la radiación UV en los espectros de emisión de la perovskita SrCoO3 sintetizada mediante el método sol-gel. La muestra sintetizada fue sinterizada a 900 °C y posteriormente caracterizada mediante diversas técnicas para analizar su estructura y sus propiedades ópticas. La difracción de rayos X (XRD) reveló dos fases: una correspondiente a SrCoO3 con estructura tetragonal y otra a SrCoO3 con estructura ortorrómbica. La espectroscopía infrarroja por transformada de Fourier (FTIR) identificó varias bandas en 560 cm-1, 697 cm-1 y 854 cm-1, atribuidas a vibraciones de estiramiento asimétrico de Co³⁺, vibraciones antisimétricas de Sr-O y vibraciones de torsión del ion carbonato, respectivamente. El análisis morfológico realizado mediante microscopía electrónica de barrido de emisión de campo (FESEM) reveló dos formas distintas: esférica para SrCoO3 y en forma de varilla para SrCoO3. Los espectros de absorción UV se atribuyeron a la transición interbanda de los iones 4A2 (4F) a 4T1 (4P) Co2+. Mediante fluorescencia, se observaron espectros de emisión amplios en la región visible bajo diferentes excitaciones UV, a longitudes de onda de 220 nm, 280 nm, 360 nm, 390 nm, 435 nm y 500 nm. El estudio reveló que el material preparado presenta excelentes propiedades espectroscópicas y puede explorarse para su uso en dispositivos de visualización.
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