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Detailed emission and excitation spectra of 1 were extensively examined to elucidate the energy-transfer mechanisms in this system . The typical EuIII emission at 612 nm with lifetime of 0.55 ms when excited at 360 nm can be assigned to the excitation of the auxiliary organic ligand followed by energy transfer to the EuIII ion. Excitation of TTA at 360 nm also triggered the characteristic coumarin blue emission and Rhodamine 6G green emission, beside the EuIII emission,through multichannel energy transfer.Moreover, the excitation at 415 nm has the potential to cause the characteristic Rhodamine 6G green emission, besides the major coumarin blue emission, through fluorescence resonant energy transfer.In this regard, the nearly white emission should be attributed mainly to the equilibrium of these multichannel energy-transfer processes, rather than simple overlap of the emission spectra, when the sample was excited at 388 nm, the middle point between 360 (red EuIII emission) and 415 nm (blue coumarin emission). These multichannel energy-transfer processes thus act as significant balancers that diminish the emission band edges for white-light emission. The considerably shorter lifetime (0.28 ns) of the emission at 460 nm of 1 compared to reference material N-butyl-7-diethylamino-2-oxochromen-3-carboxamide (0.46 ns) under the same experimental condition (excited at 388 nm) suggests the possibility of energy transfer from the coumarin moiety to the Rhodamine 6G moiety. |
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xxzhang010
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4楼2009-08-27 11:18:57
xxzhang010
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inter_dudu(金币+20,VIP+0):还有最后一小段。。 8-26 14:54
inter_dudu(金币+20,VIP+0):还有最后一小段。。 8-26 14:54
| 我们深入考察了样品1的详细的辐射和激发光谱以说明这个系统的能量转化机理。当在360 nm激发时，Eu3+在612nm片出再现了寿命为0.55 ms的发射。这归属于能量向Eu3+离子转移后有机配体的激发。通过多渠道能量转移，TTA在360nm处的激发引发了香豆素的蓝色特性发光，罗丹明6G的绿色发射以及Eu3+的激发。此外，通过荧光共振能量转移，在415 nm激发有可能导致特征罗丹明6G的绿光发射以及大量的香豆素蓝色发光。在这一点上，当样品在388nm片受激发时，在360nm（Eu3+的红色发射）和415nm（香豆素的蓝色发射）之间接近白色光发射主要归因于多通道能量转化过程的平衡，而不是简单的发射谱图的迭加。这些多通道能量转移过程起到了重要的平衡器的作用，它减少了白光发射频带边缘。 |
3楼2009-08-26 14:42:49