A Single-Component White-Emitting CaSr2Al2O6:Ce3+, Li+, Mn2+ Phosphor via Energy Transfer

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• 作者：Yanyan Li ; Yurong Shi ; Ge Zhu ; Quansheng Wu ; Hao Li ; Xicheng Wang ; Qian Wang ; Yuhua Wang
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：July 21, 2014
• 年：2014
• 卷：53
• 期：14
• 页码：7668-7675
• 全文大小：569K
• ISSN：1520-510X

文摘

A series of single-component Ce³⁺, Li⁺, Mn²⁺ ions codoped color-tunable CaSr₂Al₂O₆ phosphors were synthesized by a high-temperature solid-state reaction, and the photoluminescence properties as well as the energy transfer mechanism from Ce³⁺ to Mn²⁺ ions have been investigated in detail. The Ce³⁺ activated phosphors have strong absorption in the range of 250鈥?20 nm and can give a blue emission centered at about 460 nm. When Mn²⁺ ions are codoped, the emission of CaSr₂Al₂O₆:Ce³⁺, Li⁺, Mn²⁺ phosphors can be tuned from blue to red through adjusting the doping concentration of the Mn²⁺ ions, under the irradiation of 358 nm. When the concentration of Mn²⁺ is increased to 0.02, a warm-white light can be obtained with good CIE coordinates of (0.388, 0.323) and a low CCT of 3284 K. The energy transfer mechanism from the Ce³⁺ to Mn²⁺ ions is demonstrated to be a quadrupole鈥搎uadrupole interaction based on the analysis of the decay curves of the phosphors. The thermal quenching stability was also investigated. The results indicate that CaSr₂Al₂O₆:Ce³⁺, Li⁺, Mn²⁺ samples might have potential applications in w-LEDs.