CaCO₃ (Calcite) Co-Doped with Eu and Cr: The Effect of Chromium/Europium Ratio on Blue Light Emission
DOI:
https://doi.org/10.29356/jmcs.v69i3.2185Keywords:
CaCO3: Eu-Cr, light emission, blueshiftAbstract
Abstract. The emission spectra of CaCO3 co-doped with Eu and Cr have been studied in the UV-Vis region. A change in both the emission wavelength from 426 to 423 nm and the intensity, which is 30 times higher with respect to CaCO3:Eu, indicates a significant modification of the optical properties of CaCO3:Eu due to the influence of chromium (Cr/Eu = 0.5). Changes in the band gap (Eg) from 6 to 5.2 eV were observed when the material was calcined at 700 °C. This emission phenomenon was also observed at 600, 800 and 900 °C, but with lower intensity. Analysis of the excitation and emission bands indicates that Eu is in the 2+ oxidation state and Cr is in the 6+ oxidation state. This is because the emission occurs in the blue-violet region of the visible spectrum when exposed to UV light with a wavelength of 254 nm. The material has potential LED applications.
Resumen. Se estudiaron los espectros de emisión del CaCO3 codopado con Eu y Cr en la región UV-Vis. Se observaron cambios en la longitud de onda de emisión de 426 a 423 nm y en la intensidad que resultó 30 veces mayor respecto a CaCO3:Eu, lo que indica una modificación significativa en las propiedades ópticas de CaCO3:Eu debido a la influencia del cromo (Cr/Eu = 0.5). Se observaron cambios en la energía de brecha (Eg) de 6 a 5.2 eV cuando el material se calcinó a 700 °C. Este fenómeno de emisión se observó también a 600, 800 y 900 °C, aunque con menor intensidad. El análisis de las bandas de excitación y emisión indica que el europio se encuentra en estado de oxidación 2+ y el cromo en estado de oxidación 6+. Esto se debe a que la emisión se produce en la región azul-violeta del espectro visible cuando se expone a una luz UV con una longitud de onda de 254 nm, por lo que el material puede tener aplicaciones potenciales como LED.
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