Optical properties and energy transfers of Ce3+ and Mn2+ in Ba9Sc2(SiO4)(6)
Optical properties and energy transfers of Ce3+ and Mn2+ in Ba9Sc2(SiO4)(6)
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DOI：
10.1016/j.jlumin.2013.10.017
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发表时间：
2014-02
影响因子：
3.6
通讯作者：
Xia Zhang;Yongfu Liu;Jian Lin;Z. Hao;Yongshi Luo;Qingzhe Liu;Jiahua Zhang
中科院分区：
文献类型：
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作者：
Xia Zhang;Yongfu Liu;Jian Lin;Z. Hao;Yongshi Luo;Qingzhe Liu;Jiahua Zhang
XRD分析表明，Ce 3+和Mn 2+分别优先存在于Ba 2+和Sc 3+位。Ba_9Sc_2（SiO_4）_6：Ce ~（3+）（BSS：Ce ~（3+））在383 nm处有一个强的发射带。共掺杂Mn ~（2+）可以通过Ce ~（3+）-Mn ~（2+）的能量转移（Ce ~（3+）-Mn ~（2+））产生Mn ~（2+）在615 nm处的红光发射带。基于Inokuti-Hirayama模型，研究了蒸散的动力学过程，得到了蒸散的机理、临界距离和临界系数。当Ce ~（3+）浓度为5mol%时，相应的速率常数和临界距离分别为8.4×10 ~（-37）cm ~ 6s ~（-1）和0.52nm。ET效率可达48%。还研究了Mn 2+与Ce 3+的发射强度比，以了解蓝色Ce 3+被UV光激发时的颜色可调发光。这些结果显示了该荧光粉在白色LED中的应用前景。
Analysis of XRD patterns indicates that Ce3+and Mn2+in Ba9Sc2(SiO4)6(BSS) presents preferably at the Sc3+and the Ba2+site, respectively. Ba9Sc2(SiO4)6:Ce3+(BSS:Ce3+) exhibits an intense emission band peaked at 383 nm. Codoping Mn2+into this material can generate a red emission band at 615 nm of Mn2+through Ce3+–Mn2+energy transfers (ETs). To achieve the ET mechanisms, critical distance and coefficient, the dynamical processes of the ET are investigated based on Inokuti–Hirayama model. For Ce3+concentration of 5 mol%, the corresponding rate constant and the critical distance are evaluated to be 8.4×10−37cm6s−1and 0.52 nm, respectively. The ET efficiency can reach 48%. The emission intensity ratio of the Mn2+to the Ce3+is also studied to understand color-tunable luminescence as the blue Ce3+is excited by UV light. These results show the promising application of this phosphor for white LEDs.