Luminescence Properties and Energy Transfer of Eu/Mn-Coactivated Mg2Al4Si5O18 as a Potential Phosphor for White-Light LEDs

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• 作者：Jian Chen ; Yangai Liu ; Minghao Fang ; Zhaohui Huang
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：November 3, 2014
• 年：2014
• 卷：53
• 期：21
• 页码：11396-11403
• 全文大小：595K
• ISSN：1520-510X

文摘

A series of blue-to-white emitting Mg₂Al₄Si₅O₁₈: Eu²⁺, Mn²⁺ phosphors were synthesized via high-temperature solid-state method, and their luminescence properties were investigated in detail. Under near-ultraviolet (UV) light excitation of 365 nm, Eu²⁺-doped Mg₂Al₄Si₅O₁₈ exhibits a broad blue emission band peaked at 469 nm, and Mn²⁺-doped Mg₂Al₄Si₅O₁₈ shows a broad orange-red emission band near 600 nm. The energy transfer from Eu²⁺ to Mn²⁺ in Mg₂Al₄Si₅O₁₈ host matrix can be found, and the resonant type is demonstrated by a dipole鈥搎uadrupole mechanism. The emission hue can be tuned from blue (0.17, 0.17) to bluish green (0.22, 0.29) and finally to white (0.31, 0.33) by properly varying the ratio of Eu²⁺/Mn²⁺. The thermal quenching property of the sample was investigated, and the activation energy 螖E was estimated to be 0.30 eV. Additionally, the energy transfer critical distance between Eu²⁺ and Mn²⁺ was calculated. With appropriate tuning of activator content, the Mg₂Al₄Si₅O₁₈: Eu²⁺, Mn²⁺ phosphor may have potential application for UV light-emitting diodes.