Second Harmonic Generation of C60 Incorporated in Alkali Metal Ion Zeolites and Mesoporous MCM-41 Silica

详细信息    查看全文

• 作者：José ; Raul Herance ; Encarna Peris ; José ; Vidal ; José ; Luis Bourdelande ; Jordi Marquet ; and Hermenegildo Garcí ; a
• 刊名：Chemistry of Materials
• 出版年：2005
• 出版时间：August 9, 2005
• 年：2005
• 卷：17
• 期：16
• 页码：4097 - 4102
• 全文大小：68K
• 年卷期：v.17,no.16(August 9, 2005)
• ISSN：1520-5002

文摘

Different loadings of C₆₀ have been incorporated in mesoporous MCM-41 aluminosilicate as well asproton and alkali metal ion zeolites. These samples show non-linear optics activity whose efficiencyincreases upon C₆₀ content, size of the alkali metal ion, and laser exposure. The later unprecedentedsecond harmonic generation (SHG) enhancement effect can lead up to 2 orders of magnitude efficiencyincrease. After having irradiated the solid, the SHG enhancement decays upon standing in the dark towardthe initial value of fresh and unexposed samples. EPR measurements and alternative generation of zeoliteelectron-holes ions pairs have ruled out triplet excited states and radical ions as responsible for thisenhancement upon irradiation. One proposal at the moment is that this SHG activity enhancement arisesfrom unstable photoproducts such as photoadduct or dimers. However, attempts to isolate any C₆₀-derivedphotoproduct have met with failure so far.