Influence of Precalcination and Boron-Doping on the Initial Photoluminescent Properties of SrAl2O4:Eu,Dy Phosphors

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• 作者：Jitao Chen ; Feng Gu ; Chunzhong Li
• 刊名：Crystal Growth & Design
• 出版年：2008
• 出版时间：September 3, 2008
• 年：2008
• 卷：8
• 期：9
• 页码：3175-3179
• 全文大小：290K
• 年卷期：v.8,no.9(September 3, 2008)
• ISSN：1528-7505

文摘

An improved process for the preparation of SrAl₂O₄:Eu,Dy phosphors was developed by introducing a precalcination process for the precursor synthesized via the coprecipitation method. The structural and initial photoluminescent characteristics of these SrAl₂O₄:Eu,Dy phosphors were investigated using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), electron paramagnetic resonance (EPR), Fourier transform infrared spectroscopy (FT-IR), and photoluminescence spectroscopy (PL). The experimental results revealed that the precalcination process could facilitate the doped boron’s effect as a flux along with the formation of more oxygen vacancies around Eu²⁺ ions, which resulted in the remarkable increase of the initial photoluminescent intensity of the samples. When the doping concentration of boron was 30%, the obtained SrAl₂O₄:Eu,Dy sample possessed a photoluminescent intensity two times higher than that of the sample prepared without the precalcination process. The boron doping also induced the appearance of Sr₄Al₁₄O₂₅ phase in the sample and an obvious blue shift of the emission band can be observed. Due to the promising initial photoluminescent properties, the as-prepared SrAl₂O₄:Eu,Dy samples show potential display applications in particular areas.