Loading…

Structural and Optical Properties of Rhodamine Dye Aqueous Solutions and Thin Films

The absorption and emission spectra of six rhodamine dyes are examined in dilute aqueous solution and as thin films on a glass substrate. The absorption and emission spectra in water can be described using the displaced harmonic oscillator (DHO) model. The changes of the absorption maxima in aqueous...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physical chemistry. C 2022-11, Vol.126 (45), p.19386-19396
Main Authors: Dubnicka, Mara, Euler, William B.
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The absorption and emission spectra of six rhodamine dyes are examined in dilute aqueous solution and as thin films on a glass substrate. The absorption and emission spectra in water can be described using the displaced harmonic oscillator (DHO) model. The changes of the absorption maxima in aqueous solution are controlled by the substitution of alkyl groups on the xanthene nitrogen atoms, which is supported by density functional theory calculations. In addition, the nature of the alkyl substitution influences the excited state lifetimes. In contrast, the photophysical behavior of thin films of the dyes cannot be described using the DHO model. Rather, the spectral changes depend on interactions with the glass substrate for thin films and by aggregation for thicker films. The intensity of the emission spectra can be maximized by controlling the film thickness to be less than a monolayer.
ISSN:1932-7447
1932-7455
DOI:10.1021/acs.jpcc.2c05138