首页|Development of red phosphor Li8CaLa2Ta2O13∶Eu3+for WLEDs and anti-counterfeiting applications
Development of red phosphor Li8CaLa2Ta2O13∶Eu3+for WLEDs and anti-counterfeiting applications
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A set of novel red phosphors Li8CaLa2Ta2O13∶xEu3+(LCLTO∶xEu3+)were successfully prepared using a solid-state reaction method.The properties of the prepared samples,including phase purity,elemental composition,and morphology,were systematically investigated using X-ray diffraction,scanning electron microscopy,and diffuse reflectance spectroscopy analyses.The 610 nm maximum emission peak is attributed to the 5D0→7F2 transition of Eu3+ion under 394 nm irradiation.Among all the LCLTO∶xEu3+phosphors,LCLTO∶0.6Eu3+showed the strongest emission intensity because of the concentration quenching effect of the electric dipole-dipole in-teraction among the Eu3+ions,which was also demonstrated by the decay curves.Remarkably,the emission intensity of the optimal LCLTO∶0.6Eu3+phosphor,which exhibited a high internal quantum efficiency of 49.30％and excellent color purity of 96.79％,was approximately 2.29 times higher than that of commercial Y2O3∶Eu3+red phosphors.The thermal stability of the LCLTO∶0.6Eu3+sample with good color stability was meticulously inves-tigated.The fabricated white-light-emitting diode(WLED)exhibited a superior color-rendering index of Ra=82 and chromaticity coordinates of(0.3260,0.3639),suggesting that LCLTO∶0.6Eu3+has potential applicability in developing efficient and high-quality WLEDs.Moreover,the prepared LCLTO∶0.6Eu3+/PDMS composite film demonstrated exceptional flexural resistance and chemical stability,indicating considerable promise for practical anti-counterfeiting applications.
College of Chemistry and Materials,Fujian Province University Key Laboratory of Green Energy and Environment Catalysis,Ningde Normal University,Ningde 352100,China
School of Environment and Resources,School of Carbon Neutral and Modem Industry,Fujian Normal University,Fuzhou 350007,China
College of Information and Mechanical & Electrical Engineering Ningde Normal University,Ningde 352100,China
College of Chemistry,Fuzhou University,Fuzhou 350108,China
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Foundation of Fujian ProvinceInnovative Research Team of Ningde Normal UniversityFujian Provincial Department of Education
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