Luminescence and site occupancies of Eu3+ in La2CaB10O19.
Luminescence and site occupancies of Eu3+ in La2CaB10O19.
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DOI：
10.1039/c3dt50878a
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发表时间：
2013-08
影响因子：
4
通讯作者：
Huihong Lin;Dejian Hou;Lan Li;Ye Tao;Hongbin Liang
中科院分区：
文献类型：
--
作者：
Huihong Lin;Dejian Hou;Lan Li;Ye Tao;Hongbin Liang
制备了具有标称化学式La（2-x）Eu（x）CaB 10 O 19和La 2Ca（1-2x）Eu（x）Na（x）B 10 O 19的Eu（3+）激活的La 2CaB 10 O 19磷光体。研究了其在VUV-UV激发下的发光特性。发光光谱表明，Eu（3+）离子同时占据了Ca（2+）和La（3+）的位置。在Ca（2+）位和La（3+）位分别观察到O（2-）→ Eu（3+）的电荷转移带（CTB）和（5）D 0 →（7）F0发射。得到了Eu（3+）在两个位置上的能级示意图。测量了这两个位置的（5）D 0 →（7）F0跃迁的发光衰减。
Eu(3+)-activated La2CaB10O19 phosphors with nominal chemical formulae La(2-x)Eu(x)CaB10O19 and La2Ca(1-2x)Eu(x)Na(x)B10O19 were prepared. The luminescence properties under VUV-UV excitation were investigated. Luminescence spectra reveal Eu(3+) ions occupy both Ca(2+) and La(3+) sites in all samples. The O(2-)→ Eu(3+) charge transfer bands (CTBs) and the (5)D0→(7)F0 emissions of Eu(3+) at Ca (2+) site and La(3+) site are identified, respectively. The schematic energy levels for Eu(3+) in two sites were achieved. Luminescence decays of the (5)D0→(7)F0 transitions were measured for both sites.