Temperature dependence of the Eu3+ D-5(0) lifetime in europium tris(2,2,6,6-tetramethyl-3,5-heptanedionato)
Temperature dependence of the Eu3+ D-5(0) lifetime in europium tris(2,2,6,6-tetramethyl-3,5-heptanedionato)
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DOI：
10.1021/jp953702x
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发表时间：
1996-05-30
影响因子：
--
通讯作者：
Xu, H
中科院分区：
文献类型：
--
作者：
Berry, MT;May, PS;Xu, H
提出了固体铕三(2,2,6,6-四甲基-3,5-七乙二酸)中Eu3+ D-5(0)弛豫率的温度依赖性。 Eu3+ 发射在室温范围内被强烈猝灭。有人提出，D-5(0) 发射的热猝灭是通过从 D-5(0) 到配体到镧系元素电荷转移态的交叉。使用Mott 模型以及Englman 和Jortner 模型确定交叉过程的活化能，分别产生4120 +/- 和5700 +/- 300 cm(-1) 的值。在 Eu(thd)(3) 作为单体存在的介质中，交换过程效率较低。
The temperature dependence of the Eu3+ D-5(0) relaxation rate in solid europium tris(2,2,6,6-tetramethyl-3,5-heptaaedionato) is presented. Eu3+ emission is strongly quenched in the region of room temperature. It is proposed that thermal quenching of D-5(0) emission is via crossover from the D-5(0) to a ligand-to-lanthanide charge transfer state. Activation energies for the crossover process were determined using the models of Mott and of Englman and Jortner, yielding values of 4120 +/- and 5700 +/- 300 cm(-1), respectively. The crossover process is less efficient in media in which Eu(thd)(3) exists as a monomer.