Intramolecular Energy Transfer and Co-luminescence Effect in Rare Earth Ions (La, Y, Gd and Tb) Doped with Eu3+ β-diketone Complexes
Intramolecular Energy Transfer and Co-luminescence Effect in Rare Earth Ions (La, Y, Gd and Tb) Doped with Eu3+ β-diketone Complexes
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DOI：
10.1007/s10895-008-0456-5
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发表时间：
2009-07-01
影响因子：
2.7
通讯作者：
Zhao, Yongliang
中科院分区：
文献类型：
--
作者：
Li, Ying;Zhao, Yongliang
本文合成了Eu3+与1-(2-萘甲酰基)-3，3，3-三氟丙酮(TFNB)和2‘2-联吡啶(BPY)的β-二酮配合物。此外，我们还系统地研究了稀土惰性离子(La3+、Gd3+、Y3+)和发光离子Tb3+对Eu(TFNb)(3)bPY的共荧光效应。通过对掺杂络合物发光光谱的研究可以发现共发光效应，这意味着其他稀土离子(La3+、Y3+、Gd3+和Tb3+)的存在可以增强中心Eu3+的发光强度，这可能是由于稀土离子与Eu3+之间的分子内能量转移所致。所有配合物中有效的分子内能量转移主要发生在配体TFNB和中心Eu3+之间。通过研究中心Eu3+与其他惰性离子之间的共荧光效应，对所有这些合成材料的发光性能进行了全面的表征和详细的研究。对所有配合物的发光性质的进一步研究表明，相应的Eu3+的特征发光通过分子内能量从配体转移到中心Eu3+。同时，所有合成材料的D-5(0)->；F-7(2)跃迁的发光强度、D-5(0)寿命和D-5(0)发光量子效率的差异证实了掺杂的配合物Eu0.5Tb0.5(TFNB)(3)BPY比纯Eu(TFNB)(3)BPY具有更高的D-5(0)发光量子效率和更长的寿命。
In this paper, Eu3+ beta-diketone Complexes with the two ligands 1-(2-naphthoyl)-3, 3, 3-trifluoroacetonate (TFNB) and 2'2-bipyridine (bpy) have been synthesized. Furthermore, we reported a systematical study of the co-fluorescence effect of Eu(TFNB)(3)bpy doped with inert rare earth ions (La3+, Gd3+ and Y3+) and luminescence ion Tb3+. The co-luminescence effect can be found by studying the luminescence spectra of the doped complexes, which means that the existence of the other rare earth ions (La3+, Y3+, Gd3+ and Tb3+) can enhance the luminescence intensity of the central Eu3+, which may be due to the intramolecular energy transfer between rare earth ions and Eu3+. The efficient intramolecular energy transfer in all the complexes mainly occurs between the ligand TFNB and the central Eu3+. Full characterization and detail studies of luminescence properties of all these synthesized materials were investigated in relation to co-fluorescence effect between the central Eu3+ and other inert ions. Further investigation into the luminescence properties of all the complexes show that the characteristic luminescence of the corresponding Eu3+ through the intramolecular energy transfers from the ligand to the central Eu3+. Meantime, the differences in luminescence intensity of the D-5(0)-> F-7(2) transition, in the D-5(0) lifetimes and in the D-5(0) luminescence quantum efficiency among all the synthesized materials confirm that the doped complex Eu0.5Tb0.5(TFNB)(3)bpy exhibits higher D-5(0) luminescence quantum efficiency and longer lifetime than the pure Eu(TFNB)(3)bpy complex and other materials.