Abstract
We synthesized and studied Eu3+-doped aluminoborate samples by an easy and low-cost polymeric precursor method. The samples containing 1mol% of Eu3+ were heat-treated at 800, 900, and 1000°C to eliminate organic compounds, providing high optical quality and structural purity. All materials were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, high-resolution transmission electron microscopy, selected area electron diffraction, diffuse reflectance spectra in the ultraviolet–visible–near-infrared regions, and photoluminescence measurements. A highly pure Eu3+-doped Al4B2O9 orthorhombic phasewith a well-crystallized grain dimension of around 30nm was obtained with high red photoluminescence emission. It is a potential host for rare-earth ions, especially due to its high aluminum concentration. The decay lifetime of 5D0 level of Eu3+ (the emission at 612nm) was determined to be between 1.6 and 2.1ms, and an averaged quantum efficiency of 54% was determined. Moreover, some parameters of the Judd–Ofelt theory applied to Eu3+ emissions from powders were calculated and analyzed. The results show that Eu3+-doped Al4B2O9 amorphous and crystalline compounds have large potential to be used in lighting devices.
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