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genhunter

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专业: 肿瘤化学药物治疗

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超级老快: 金币+70, 翻译EPI+1, ★★★很有帮助 2016-08-17 21:29:57

Europium-doped luminescent materials are unique among many other rare earth ion-doped luminescent materials in their excellent fluorescent properties, and hold very important roles in research and development in areas of lighting and image display. Europium is found in chemicals in two types: Eu3+ and Eu2+. The light emitted by Eu3+ is composed of a series of sharp emission peaks in red spectrum, which correspond to 4f-4f energy level transitions. Consequently, the frequency of the emission is hardly influenced by the nearby crystalline field. On the other hand, the light emission from Eu2+ originated from 4f5d-4f level transitions covers a broad spectrum. Since the electrons in the outmost layer are unshielded, the frequency of light emitted and the bandwidth are strongly dependent on the covalency ofthe matrix, the radius of cations, and the strength of crystalline field. As a result, the spectrum vary from violet to red.

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