Sintering temperature and atmosphere modulated evolution of structure and luminescence of 2CaO-P₂O₅-B₂O₃: Eu phosphors

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• 作者：Chaofeng Zhu ; Jia Wang ; Xiaorong Ren ; Yanfei Zhang ; Shujiang Liu ; Jianxing Shen ; Yuanzheng Yue
• 关键词：LED ; Phosphor ; Luminescence ; Local environment
• 刊名：Journal of Luminescence
• 出版年：January, 2014
• 年：2014
• 卷：145
• 期：Complete
• 页码：110-113
• 全文大小：517 K

文摘

Europium doped 2CaO-P₂O₅-B₂O₃ phosphors prepared via high temperature solid state reactions are reported. The evolution of luminescence and structure of the phosphors induced by variation of sintering temperature and atmosphere is investigated using photoluminescence spectra and X-ray diffraction techniques. We found that the optical performance and structure of the phosphors are sensitive to the sintering temperature and atmosphere. The luminescence intensity due to ⁵D₀鈫?sup>7F₂ transition of Eu³⁺ is decreased with increasing sintering temperature. CaBPO₅ and BPO₄ crystals co-exist in the as-prepared phosphors and the relative content of these two phases is dependent on sintering temperature. CaBPO₅ crystal favors the transition of ⁵D₀鈫?sup>7F₁ of Eu³⁺ ions, while BPO₄ enhances the emission of 612 nm. This study gives insight into the correlation between optical properties and structure of the as-prepared phosphors. The phosphors reported here are good candidates for light emitting diode applications.