Up-converted luminescence in Yb, Tm co-doped LaGaO₃ phosphors by high-energy ball milling and solid state reaction

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• 作者：Hyun Kyoung Yang^a ; Byung Kee Moon^a ; Byung Chun Choi^a ; Jung Hyun Jeong^a ; ^{jhjeong@pknu.ac.kr} ; Jung Hwan Kim^b ; Kwang Ho Kim^c
• 关键词：LaGaO3 ; Tm3+ ; Yb3+ ; Luminescence ; Up-conversion
• 刊名：Solid State Sciences
• 出版年：2012
• 出版时间：February, 2012
• 年：2012
• 卷：14
• 期：2
• 页码：236-240
• 全文大小：858 K

文摘

LaGaO₃:Tm³⁺, Yb³⁺ powder was synthesized by a high-energy ball milling (HEB) and a conventional solid state reaction (SSR). The X-ray diffraction patterns confirmed the LaGaO₃:Tm³⁺, Yb³⁺ powder phosphors to have an orthorhombic structure. The spectrum consisted of ¹G₄?¡ú?sup>3H₆, weak ¹G₄?¡ú?sup>3F₄, and intense ³H₄?¡ú?sup>3H₆ transition bands within the f¹² configuration of Tm³⁺, together with the ²F_5/2?¡ú?sup>2F_7/2 transition of Yb³⁺. Up-converted emission of the LaGaO₃:Tm³⁺, Yb³⁺ powders were observed under laser diode excitation of 975?nm. The PL intensity of the HEB-LaGaO₃:Tm³⁺, Yb³⁺ powders sintered at 1300?¡ãC were higher than those of all LaGaO₃:Tm³⁺, Yb³⁺ powder samples examined. The energy transition probability of HEB-LaGaO₃:Tm³⁺, Yb³⁺ powders are higher than that of the SSR-LaGaO₃:Tm³⁺, Yb³⁺ powders. Compared to the solid state reaction method, synthesis by high-energy ball milling is simple and provides improved crystallinity of the host.