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高手帮忙翻译了，要能通顺。谢谢 Fluorescence properties of 2 and 4 The ligand-assisted photoluminescence properties of the lanthanide compounds 2 and 4 were examined at room temperature.When excited at 335 nm, 2 emits red light, while 4 shows green light emission upon excitation at 334 nm.The photoluminescence spectra are shown in Fig.4.The characteristic emission bands of 2 at 584, 598, 622,and 693 nm are assigned to 5D0 → 7FJ (J =0,1,2, and 4) transitions,while the emission peaks of 4 at 495, 548, 590,and 625 nm can be attributed to 5D4→7FJ (J =6,5,4,and3) transitions,respectively.However,these characteristic emission bands indicate that the ligand-to-metal energy transfer is moderately efficient under the experimental conditions.It is noted that the forbidden transition 5D0 → 7F0 was also observed in the europium compound 2.Moreover,the preferred transition,5D0→7F2 for europium-containing luminescent materials,is much more intense than the 5D0→7F1 transition in 2.It is well-known that the 5D0→7F2 transition induced by the electric dipole moment is hypersensitive to the environment of the Euion,while the 5D0→7F1 transition is a magnetic dipole transition which is fairly insensitive to the coordination environment of the Euion.The intensity ratio I(5D0→7F2)/I(5D0→7F1) is equal to 3.57,which indicates that Eu3+ ions are not at an inversion center [12a].This is in agreement with the result of the single crystal X-ray diffraction. |
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kongxiangshi
金虫 (小有名气)
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zhchd2008(金币+2, 翻译EPI+1): 2010-04-13 16:56
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2和4的荧光性质 在室温下检测镧化物2和4的配基辅助光致发光特性。当激发波长在335，2发出红光，而4显示了绿色的光激发光光谱在334 nm。4显示绿光发射。图4给出了光致发光光谱。分别地，2的特征发射带为584, 598, 622,和693 nm可被分配到5D0 → 7FJ (J =0,1,2, 和4) 跃迁，4的发射峰在495, 548, 590,和625 nm处可归因于5D4→7FJ (J =6,5,4,and3)跃迁。然而这些特征发射带表明在实验条件下，配基到金属的能量转移是温和有效率的。应当注意，在铕化物2中也观察到了禁止的5D0 → 7F0 跃迁。更有甚者，在2中，对于含铕发光物质，可选的跃迁5D0→7F2 处比5D0→7F1 强烈的多。众所周知，被电偶极矩诱导的5D0→7F2 跃迁对Euion环境超敏感，然而，5D0→7F1 跃迁是一种磁偶极跃迁，对Euion的协调环境相当不敏感。I(5D0→7F2)/I(5D0→7F1) 的强度比率是3.57，表明Eu3+阳离子不在反伸中心。这与单晶X -射线衍射结果一致。  |
5楼2010-04-13 16:31:34
resonant
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2楼2010-04-13 12:50:14
resonant
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4楼2010-04-13 13:16:29
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