Structural Evolution of Ultrathin Films of Rhodamine 6G on Glass

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• 作者：Mingyu Chapman ; Matthew Mullen ; Elsa Novoa-Ortega ; Mona Alhasani ; James F. Elman ; William B. Euler
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：April 21, 2016
• 年：2016
• 卷：120
• 期：15
• 页码：8289-8297
• 全文大小：530K
• 年卷期：0
• ISSN：1932-7455

文摘

Self-organized rhodamine 6G (Rh6G) thin films on a glass substrate were prepared by spin-coating, dip-coating, and drop-coating. The thickness of the Rh6G layer strongly influences both the absorption and emission spectra, which are accounted for by monomers, exciton and excimer formation, and molecular aggregation. Submonolayer films of Rh6G show one maximum and one apparent shoulder in the absorption spectrum, but three peaks are required for deconvolution of the spectrum. As the thin film becomes thicker, the observed maximum shifts to lower energy, and a fourth peak is required for deconvolution. The emission spectra show similar features. In addition, the relative intensity of the emission is strongly dependent on the film thickness with thinner films being substantially more emissive than thick films.