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【答案】应助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ 超级老快: 金币+30, 翻译EPI+1, ★★★很有帮助 2016-11-22 11:37:43
电荷迁移态强烈依赖于Eu-O键长,随着键长的变化,键长越长,电荷传递态的能量越低。而在本实验中Eu3+离子均匀地分布于玻璃内部参与了玻璃结构组成,与玻璃中非桥氧键中的O2-离子形成Eu3+-O键,而氧的电负性较大,受激发时电子从配体O2-转移到Eu3+的难度较大,所需激发波长在近紫外波段的280nm附近。
Charge-transfer state is strongly dependent on the bond length between Eu-O, the longer length, the lower the energy is required for charge-transfer state transition. In this study, Eu3+ was evenly distributed within the glass and participated the ionic O2- and Eu3+ bond formation. Due to its strong electronegativity , it is difficult for electron transfer from ligand O2- to Eu3+, thus it requires a near ultraviolet excitation (280 nm) with higher energy level. |
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