Sr3GdLi(PO4)(3)F:Eu2+, Mn2+: A tunable blue-white color emitting phosphor via energy transfer for near-UV white LEDs
Sr3GdLi(PO4)(3)F:Eu2+, Mn2+: A tunable blue-white color emitting phosphor via energy transfer for near-UV white LEDs
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Sr3GdLi(PO4)(3)F:Eu2 , Mn2 ：一种可调谐蓝白光荧光粉，通过能量转移用于近紫外白光 LED
DOI：
10.1016/j.ceramint.2017.04.015
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发表时间：
2017
影响因子：
5.2
通讯作者：
胡义华
中科院分区：
文献类型：
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作者：
吕洋;金亚洪;张绍安;王传龙;居桂芳;薛飞洪;何苗;胡义华
采用高温固相反应法合成了一系列Eu 2+和Mn 2+共掺杂Sr 3GdLi（PO 4）3F荧光粉。Eu 2+单掺杂Sr 3GdLi（PO 4）3F荧光粉在230-430 nm范围内具有很好的激发特性，与商用近紫外（n-UV）LED芯片的激发特性一致，并在445 nm处产生强烈的蓝光发射。计算了Eu ~（2+）离子在Sr_3GdLi（PO_4）_3F中的临界距离，证明Eu ~（2+）离子浓度猝灭机制主要是由偶极-偶极相互作用引起的。通过在Sr_3GdLi（PO_4）_3F基质中共掺杂Eu ~（2+）和Mn ~（2+），发现了Eu ~（2+）向Mn ~（2+）的能量传递。在380 nm激发下，随着Mn 2+含量的增加，发光颜色由蓝色向白色转变，对应的色坐标由（0.189，0.108）变为（0.319，0.277）。根据实验结果和对荧光光谱及衰减曲线的分析，证实了Eu ~（2+）与Mn ~（2+）之间的能量传递是偶极-偶极机制。研究表明，所制备的Sr 3GdLi（PO 4）3F：Eu ~（2+），Mn ~（2+）荧光粉有可能成为n-UV LED的潜在候选材料。
A series of Eu2+and Mn2+co-doping Sr3GdLi(PO4)3F phosphors have been synthesized through high temperature solid state reaction. Eu2+single doped Sr3GdLi(PO4)3F phosphors have an efficient excitation in the range of 230–430 nm, which is in good agreement with the commercial near-ultraviolet (n-UV) LED chips, and gives intense blue emission centering at 445 nm. The critical distance of the Eu2+ions in Sr3GdLi(PO4)3F is computed and demonstrated that the concentration quenching mechanism of Eu2+is mostly caused by the dipole-dipole interaction. By co-doping Eu2+and Mn2+ions in the Sr3GdLi(PO4)3F host, the energy transfer from Eu2+to Mn2+that can be discovered. With the increase of Mn2+content, emission color can be adjusted from blue to white under excitation of 380 nm, corresponding to chromatic coordinates change from (0.189, 0.108) to (0.319, 0.277). The energy transfer from Eu2+to Mn2+ions is proven to be a dipole-dipole mechanism on the basis of the experimental results and analysis of photoluminescence spectra and decay curves. This study infers that the obtained Sr3GdLi(PO4)3F:Eu2+, Mn2+phosphors may be a potential candidate for n-UV LEDs.