Luminescence of Ce3+ in Different Lattice Sites of La2CaB10O19
Luminescence of Ce3+ in Different Lattice Sites of La2CaB10O19
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DOI：
10.1021/jp804149k
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发表时间：
2008-08
影响因子：
3.7
通讯作者：
Lan Li;Hong-bin Liang;Zifeng Tian;Huihong Lin;Q. Su;Guobin Zhang
中科院分区：
文献类型：
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作者：
Lan Li;Hong-bin Liang;Zifeng Tian;Huihong Lin;Q. Su;Guobin Zhang
采用高温固相反应法制备了一系列名义化学式为La2-xCexCa10O19和La2Ca1-2xCexNaxB10O19的样品。通过在真空紫外可见光谱范围内的稳态激发和发射光谱、发光衰减和时间分辨发射光谱(TRES)研究了它们的发光性质。结果表明，Ce3+离子在所有样品中占据两个晶格位置。两个中心的最低5d吸收带分别位于约272(La3+中心)和312 nm(Ca2+中心)。Ce3+离子在La3+格位上的发射衰减时间较短，为12 ns，双重态发射带在291和310 nm处有极大值。Ce3+离子在Ca2+位的发射寿命较长，为26 ns，最大能带位于329 nm和355 nm。在样品中，两个位置之间发生了有效的能量转移。
A series of samples with nominal chemical formulas La 2-x Ce x CaB 10 O 19 and La 2 Ca 1-2x Ce x Na x B 10 O 19 were prepared by a solid state reaction route at high temperature. Their luminescence properties were investigated by the steady state excitation and emission spectra in the VUV-vis range, the luminescence decays, and the time-resolved emission spectra (TRES). The results demonstrate that Ce 3+ ions occupy two lattice sites in all samples. The lowest 5d absorption bands for two sites are at about 272 (La 3+ site) and 312 nm (Ca 2+ site), respectively. The emission for Ce 3+ in the La 3+ site shows a shorter decay time of 12 ns, and the doublet emission bands have maxima at about 291 and 310 nm. The emission for the Ce 3+ in Ca 2+ site has a longer lifetime of 26 ns with band maxima at about 329 and 355 nm. Efficient energy transfer between both sites occurs in the samples.