Visible photoluminescence from nearly monodispersed Au12 clusters protected by meso-2,3-dimercaptosuccinic acid

被引：89

作者：

Negishi, Y

Tsukuda, T ^{[1
]}

机构：

[1] Res Ctr Mol Scale Nanosci, Inst Mol Sci, Okazaki, Aichi 4448585, Japan

[2] Grad Univ Adv Studies, Dept Photosci, Sch Adv Sci, Kanagawa 2400193, Japan

来源：

CHEMICAL PHYSICS LETTERS | 2004年 / 383卷 / 1-2期

关键词：

D O I：

10.1016/j.cplett.2003.10.136

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nearly monodispersed Au-12 clusters protected by monolayers of meso-2,3-dimercaptosuccinic acid (DMSA) exhibited luminescence at 630 nm with a quantum yield of 1 X 10(-6) upon the photoexcitation at 395 nm to the lowest electronic excited state. The visible PL is assigned to phosphorescence originating from a triplet-like excited state based on the large Stokes shift (1.2 eV). The PL quantum yield was enhanced up to approximate to0.9%, greater by eight orders of magnitude than that of bulk gold, by thickening the protecting layer and freezing a solvent at 77 K. The emission peak energy is discussed within the context of core-size dependent electronic structures by comparison with those of thiolate-protected gold clusters reported in the literature. (C) 2003 Elsevier B.V. All rights reserved.

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页码：161 / 165

页数：5

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