Light Assisted Dimer to Monomer Transformation in Heavily Doped Rhodamine 6G-Porous Silica Hybrids

被引：33
作者：
Carbonaro, Carlo M. [1 ]
Meinardi, Franco [2 ,3 ]
Ricci, Pier C. [1 ]
Salis, Marcello [1 ]
Anedda, Alberto [1 ,4 ]
机构：
[1] Univ Cagliari, Dipartimento Fis, I-09042 Cagliari, Italy
[2] Univ Milanno Bicocca, INFM, I-20125 Milan, Italy
[3] Univ Milanno Bicocca, Dipartimento Sci Mat, I-20125 Milan, Italy
[4] Univ Cagliari, CGS, I-09042 Monserrato, Italy
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2009年 / 113卷 / 15期
关键词：
FLUORESCENT J-DIMERS; POLY(VINYL ALCOHOL); POROUS SURFACE; GEL-GLASSES; 6G; PHOTOSTABILITY; BEHAVIOR; AGGREGATION; DYES; CAGE;
D O I：
10.1021/jp810835j
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：
The spectral properties of postdoping prepared type I Rhodarnine 6G-silica hybrids were investigated in the case of intentionally large doping (5 x 10(-2) mol/L). Beside expected concentration quenching effects, steady state and time resolved optical spectroscopy measurements displayed the presence of different kind of aggregates, both fluorescent and nonfluorescent. As the irradiation dose on the sample increases, the emission features change: the overall emission increases, the peak of the emission is blue-shifted, and the emission decay time also increases. The modifications of the spectral properties under light excitation are interpreted in terms of dimer to monomer light assisted transformation, and a thermodynamic model based on a monomolecular kinetics is presented.
引用
收藏
页码：5111 / 5116
页数：6
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