Synthesis and Photoluminescence Properties of a Blue-Emitting La3Si8N11O4:Eu2+ Phosphor
Synthesis and Photoluminescence Properties of a Blue-Emitting La3Si8N11O4:Eu2+ Phosphor
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蓝光La3Si8N11O4:Eu2荧光粉的合成及光致发光性能
DOI：
10.1021/acs.inorgchem.7b02310
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发表时间：
2017-11-20
影响因子：
4.6
通讯作者：
Xie, Rong-Jun
中科院分区：
文献类型：
--
作者：
Cu, Hui-Bing;Zhuang, Wei-Dong;Xie, Rong-Jun
采用高温固相法合成了Eu 2+掺杂的La 3Si 8 N11 O 4荧光粉，并对其光致发光性能进行了研究。La_3Si_8 N_（11）O_4：Eu ~（2+）在320 nm处有一个很宽的吸收带，其光谱范围为300-600 nm，这是由于Eu ~（2+）的4f（7）-> 4f（6）5d（1）电子跃迁引起的。发射光谱显示了一个宽的和不对称的带峰在481-513 nm取决于Eu 2+的浓度，和发射颜色可以在很宽的范围内调谐，由于Eu 2+离子之间的能量转移占据两个独立的晶体位置。与Ce 3+掺杂的La 3Si 8 N11 O 4相比，Eu 2+掺杂的La 3Si 8 N11 O 4表现出更大的热猝灭，主要是由于光电离。在320 nm激发下，内、外量子效率分别为44%和33%.
Eu2+-doped La3Si8N11O4 phosphors were synthesized, by the high temperature solid-state method, and their photoluminescence properties were investigated in this work. La3Si8N11O4:Eu2+ exhibits a strong broad absorption band centered at 320 nm, spanning the spectral range of 300-600 rim due to 4f(7) -> 4f(6)5d(1) electronic transitions of Eu2+. The emission spectra show a broad and asymmetric band peaking at 481-513 nm depending on the Eu2+ concentration, and the emission color can be tuned in a broad range owing to the energy transfer between Eu2+ ions occupying two independent crystallographic sites. Compared to the Ce3+-doped La3Si8N11O4, the Eu2+-doped one shows a larger thermal quenching, predominantly owing to photoionization. Under 320 nm excitation, the internal and external quantum efficiencies are 44 and 33%, respectively.