Luminescent properties of a novel afterglow phosphor Sr3Al2O5Cl2: Eu2+, Ce3+
Luminescent properties of a novel afterglow phosphor Sr3Al2O5Cl2: Eu2+, Ce3+
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DOI：
10.1016/j.ceramint.2014.01.020
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发表时间：
2014-07-01
影响因子：
5.2
通讯作者：
Wu, Haoyi
中科院分区：
文献类型：
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作者：
Chen, Ren;Hu, Yihua;Wu, Haoyi
采用高温固相反应法成功合成了Eu 2+和Ce 3+共掺杂Sr 3Al 2 O 5Cl 2系列余辉发光材料。通过X射线粉末衍射（XRD）、光致发光（PL）光谱、衰减曲线和热释光（TL）发光曲线对样品的结构和发光性能进行了表征。XRD结果表明，所有样品均为正交晶系，空间群为P2（1）2（1）2（1）。在254 nm和365 nm汞灯照射下，Sr 3Al 2 O 5Cl 2：Eu 2 +/Sr 3Al 2 O 5Cl 2：Ce 3+荧光粉分别出现了蓝/黄橙余辉发射，其峰值分别位于620 nm和435 nm附近，这是Eu 2 +/Ce 3+的4f（6）5d-4f（7）/5d（1）-4f（1）特征跃迁。由于Sr 3Al 2 O 5Cl 2：Eu 2+和Sr 3Al 2 O 5Cl 2：Ce 3+荧光粉的光谱范围重叠，因此发生了从Ce 3+到Eu 2+的能量转移（ET）。详细讨论了相关的ET过程。Ce ~（3+）的掺入可以显著延长Sr（3）Al（2）o（5）Cl（2）：Eu ~（2+）荧光粉的余辉时间，这是由于Ce ~（3+）的掺入增加了荧光粉的陷阱浓度。结果表明，Sr 3Al 2 O 5Cl 2：1.0%Eu2+，0.5%Ce3+样品的余辉时间为6 h，远大于Sr 3Al 2 O 5Cl 2：1.0%Eu2+样品的余辉时间（3 h）。从余辉衰减曲线和拟合结果，实验确定了增强余辉性能的最佳Ce 3+浓度为0.5%。(C)2014 Elsevier Ltd和Techna Group S.r.l. All rights reserved.
A series of Eu2+ and Ce3+ doped/co-doped Sr3Al2O5Cl2 afterglow phosphors that presented various bright colors were successfully synthesized via high temperature solid state reaction. The structure and luminescence properties of the obtained samples were characterized by X-ray powder diffraction (XRD), photoluminescence (PL) spectra and decay curves as well as the thermoluminescence (TL) glow curves. The XRD results showed that all the phase could be indexed to the orthorhombic structure with the space group P2(1)2(1)2(1). After being exposed to a 254 nm or 365 nm mercury lamp, blue/yellow-orange afterglow emissions with broad bands peaking around 620 nm/435 nm, which were ascribed to the characteristic 4f(6)5d-4f(7)/5d(1)-4f(1) transitions of Eu2+/Ce3+, could be observed in phosphors of Sr3Al2O5Cl2:Eu2+/Sr3Al2O5Cl2: Ce3+, respectively. Because of the overlap spectral range between the Sr3Al2O5Cl2:Eu2+ and Sr3Al2O5Cl2:Ce3+ phosphors, the energy transfer (ET) from Ce3+ to Eu2+ occurred. The related ET process was discussed in detail. Moreover, the incorporation of Ce3+ could significantly prolong the afterglow duration of Sr(3)Al(2)o(5)Cl(2):Eu2+ phosphor, which was due to the increase of trap concentration. Consequently, 6 h of the afterglow duration could be observed in Sr3Al2O5Cl2:1.0%Eu2+, 0.5%Ce3+ sample, exhibiting much longer than that of Sr3Al2O5Cl2: 1.0% Eu2+ (3 h). From the afterglow decay curves and the fitting results, the optimal concentration of Ce3+ for the enhanced afterglow property was experimentally determined to be 0.5%. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.