Interaction between Frenkel exciton and surface plasmon

弗兰克尔激子和表面等离子体激元之间的相互作用

• 批准号: 13650882
• 负责人: SATO Tomoo
• 金额: $ 2.62万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650882/
• 关键词: Surface Plasmon; Exciton; Noble Metal Nano Particles; J-aggregate; Cyanine Dye; Suppressive Interaction; Enhanced Interaction; Dipole-Dipole Interaction Model; 吸収増強; 発光増強; 銀ナノ粒子; 金ナノ粒子; 吸収スペクトル温度依存性

We have found a unique spectroscopic property of noble metal nano-particles directly covered with a J-aggregate monolayer (J-aggregate/noble metal nano particle). In the absorption spectra, the spectral dip at the position of the J-band was observed in the surface plasmon band. The anomalous spectral feature has been observed only in the case of the adsorption of cyanine dyes, whose J -band was in the surface plasmon band of metal particles. The dip did not appear for other dyes adsorbed on the metal particles as monomer, dimer, H-aggregate and J-aggregate whose J-band was in the interband transition band of the metal. On the other hand, cooling down the temperature from 290 K to 90 K has brought about increase of the dip area and blue shift of the dip position and the narrowing of the dip width. We have supposed that the appearance of the dip is related to the strong suppressive interaction between the surface plasmon and Frenkel exciton.In the case of J-aggregate/aminothiol/noble metal nano particle, we have found special new features as absorption enlargement in the region of the J -band, surface plasmon-mediated strong resonance fluorescence, and considerable expansion of effective wavelength region for excitation of the J-aggregate. These special features would suggest the enhanced interaction between the surface plasmon and Frenkel exciton. It is important that the excited-state J-aggregate can be generated much more efficiently and in much wider region of wavelength, because we could expect the largely increasing the overall light-harvesting efficiency.The observed both spectral features in this work, suppressive and enhanced interactions, could be reproduced by a simple dipole-dipole interaction model. It has been suggested that difference of the surface morphology of the noble metal nano particle induces the different interaction mode.

我们发现了直接覆盖有J种群单层（J-Aggregate/Noble Metal Nano颗粒）的贵金属纳米颗粒的独特光谱特性。在吸收光谱中，在表面等离子体带中观察到了J波段位置的光谱倾角。仅在氰胺染料吸附的情况下才观察到异常的光谱特征，氰染料的J频带在金属颗粒的表面等离子体带中。对于单体，二聚体，h-聚集酸盐和J型聚集的其他染料的浸入并未出现在金属颗粒上的其他染料，其J波段在金属的频带间过渡带中。另一方面，将温度从290 K冷却到90 K，导致倾角区域增加，倾角位置的蓝移以及倾角宽度的狭窄。 We have supposed that the appearance of the dip is related to the strong suppressive interaction between the surface plasmon and Frenkel exciton.In the case of J-aggregate/aminothiol/noble metal nano particle, we have found special new features as absorption enlargement in the region of the J -band, surface plasmon-mediated strong resonance fluorescence, and considerable expansion of effective wavelength region for excitation of the J聚集。这些特殊功能将表明表面等离子体和Frenkel激子之间的相互作用增强。重要的是，可以更有效地和更宽的波长区域生成兴奋状态的J种群，因为我们可以期望这项工作中观察到的两个频谱特征在很大程度上提高了整体的轻度收获效率。已经提出，贵金属纳米粒子的表面形态差异会诱导不同的相互作用模式。

项目成果

Spectroscopic Properties of Noble Metal Nano-Particles Covered with J-Aggregates of Cyanine Dye

花青染料 J-聚集体包覆贵金属纳米粒子的光谱性能

• 发表时间: 2001
• 期刊: Chemistry Letters 2001
• 作者: Tomoo Sato

Fusahiro Tsugawa, Toshinori Tomita, and Mitsuo Kawasaki, Spectroscopic Properties of Noble Metal Nano Particles Covered with J-Aggregates of Cyanine Dye

Fusahiro Tsukawa、Toshinori Tomita 和 Mitsuo Kawasaki，花青染料 J 聚集体覆盖的贵金属纳米粒子的光谱特性

• 发表时间: 2001
• 期刊: Chemistry Letters 2001
• 作者: Tomoo Sato;Tomoo Sato
• 通讯作者: Tomoo Sato