Pure red upconversion emission from Yb₃Al₅O₁₂ phase doped with high Er³⁺ concentration

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• 作者：Changfu Xu ; Qibin Yang ; Guozhong Ren ; Yunxin Liu
• 关键词：Yb₃Al₅O₁₂ (YbAG) ; Pure red upconversion emission
• 刊名：Journal of Alloys and Compounds
• 出版年：2010
• 出版时间：30 July 2010
• 年：2010
• 卷：503
• 期：1
• 页码：82-85
• 全文大小：303 K

文摘

Pure red upconversion luminescence was observed from Er³⁺ doped Yb₃Al₅O₁₂ powder synthesized by sol–gel method. X-ray diffraction (XRD) and transmission electron microscopy (TEM) patterns revealed two phases Yb₃Al₅O₁₂ and Yb₂O₃ coexisting as crystals. High resolution transmission electron microscopy (HRTEM) and energy dispersive spectroscopy (EDS) analysis showed that the luminescence was from Er³⁺ in Yb₃Al₅O₁₂. High pure red emission was obtained in all three samples with the emission intensity ratios of red to green (R/G) being 78, 110 and 136 respectively. It was found that Yb³⁺ was a composition of the host Yb₃Al₅O₁₂ rather than a doped ion and still played a sensitizing role and the R/G was in a positive variation with the ratio of Yb³⁺/Er³⁺. The possible mechanism can be ascribed to the resonant energy transfer ⁴F_7/2(Er³⁺) + ⁴I_11/2(Er³⁺) → 2²F_9/2(Er³⁺) caused by the high content of Yb³⁺.