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Tuning the formation of aggregates in silica–Rhodamine 6G hybrids by thermal treatment

Paper ID Volume ID Publish Year Pages File Format Full-Text
27362 44018 2011 8 PDF Available
Title
Tuning the formation of aggregates in silica–Rhodamine 6G hybrids by thermal treatment
Abstract

The formation of fluorescent J aggregates in organic–inorganic Rhodamine 6G–silica hybrids is investigated in sol–gel prepared bulk samples in the concentration range of the transition from fluorescent to non-fluorescent aggregates (1.0 × 10−4–1.0 × 10−3 mol/l). The spectral properties of the observed aggregates are studied by recording the excitation and emission fluorescence spectra and the fluorescence decay kinetics and analyzed in the exciton theory framework. The reported optical features depend both on the synthesis technique and the post synthesis treatments. It is shown that the geometry of fluorescent J aggregates can be modified from oblique to coplanar inclined configuration by thermal treatment of the samples.

► Fluorescent J dimers in Rhodamine 6G–silica type I hybrids. ► J to H dimers concentration threshold is about 1.0 × 10−3 mol/l. ► Large decrease of dye mobility in chloride samples. ► Oblique to coplanar J dimers tuning by 65 ̊C thermal treatment.

Keywords
Aggregates; Organic–inorganic hybrids; Optical spectroscopy; Exciton theory
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 222, Issue 1, 5 July 2011, Pages 56–63
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
You save - $31
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