Utilizing urea as a precipitant and yttrium nitrate hexahydrate (YN3O9·6H2O) as the sole precursor,Y2O3∶Eu3+ spongy microspheres,were synthesized by a hydrothermal method.They were characterized by X-ray diffractometer,energy dispersive spectrometer,X-ray photoelectron spectroscopy,field emission scanning electron microscope,and fluorescence spectrophotometer.The effects of various reaction conditions on the product's morphology,crystal structure,elemental composition,and photoluminescent properties were investigated.and a potential formation mechanism of the spongy microspheres was proposed.The experimental results indicated that when the molar concentration ratio of YN3O9·6H2O∶CH4N2O was 1∶4 and annealed at 800℃ for 2 hours,the prepared product exhibited a spongy microsphere structure.As the molar concentration of CH4N2O decreased,the resulting product became spongy microspheres and nanoparticles.As the molar concentration of CH4N2O increased,the product transformed into microsheets and microrods.When the molar concentration of doped Eu3+ was 6%,the spongy microspheres exhibited the strongest red emission peak at the wavelength of 617nm,corresponding to the 5D0→7F2transition of Eu3+.With the increase of doping concentration,the luminance intensity significantly decreased.The hydrothermal synthesis method was user-friendly and cost-effective,and the resulting spongy microspheres structure exhibited better crystallinity and uniform size distribution.Adjusting only the concentration of the precipitant could effectively manipulate the product's morphological features,offering valuable insights for the production of Y2O3∶Eu3+ spongy microspheres with controlled morphologies and outstanding luminescent properties.
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基金资助
国家自然科学基金(U1704145);海南省自然科学基金(522MS062);海南省院士创新平台科研项目(YSPTZX202207)
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