On the formation of aggregates in silica-rhodamine 6G type II hybrids

被引：33

作者：

Carbonaro, Carlo M. ^{[1
]}

Ricci, Pier Carlo

Grandi, Stefania ^{[2
]}

Marceddu, Marco ^{[1
]}

Corpino, Riccardo ^{[1
]}

Salis, Marcello

Anedda, Alberto ^{[1
]}

机构：

[1] Univ Cagliari, Dept Phys, CGS, I-09042 Monserrato, Italy

[2] Univ Pavia, Dept Chem, CNR IENI, I-27100 Pavia, Italy

来源：

RSC ADVANCES | 2012年 / 2卷 / 05期

关键词：

SOL-GEL-GLASSES; NORMALIZED EMISSION-SPECTROSCOPY; FLUORESCENT J-DIMERS; MONOMER TRANSFORMATION; POROUS SURFACE; FILMS; DYES; ADSORPTION; MOLECULES; SYSTEMS;

D O I：

10.1039/c2ra00830k

中图分类号：

O6 [化学];

学科分类号：

070301 [无机化学];

摘要：

The spectroscopic features of dye aggregates in organic-inorganic Rhodamine 6G-silica hybrids are investigated in sol-gel prepared type II bulk and thick film samples in the 10(-4)-10(-3) mol l(-1) concentration range. No aggregates are observed in film samples irrespective of the dye concentration and the spectroscopic features are ascribed to fluorescent monomers. On the contrary, by means of excitation and emission fluorescence measurements and the analysis of fluorescence decay kinetics the formation of fluorescent aggregates is reported in bulk samples and the geometry of the formed aggregates at the silica surface is discussed on the single exciton theory framework. Beside the distribution of a single emitting specie observed in bulk samples and individuated as oblique J dimers, the analysis of the excitation spectra indicate also the presence of "dark'' monomer units. An energy transfer mechanism is hypothesized to explain the interaction of the monomer-dimer pair.

引用

页码：1905 / 1912

页数：8

共 43 条

[1]

Formation of fluorescent aggregates in Rhodamine 6G doped silica glasses [J].