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Abstract

The full information of the luminescence intensity as a function of excitation and emission wavenumber is contained in the excitation-emission matrix (EEM). An equal intensity contour plot of this EEM allows a convenient two-dimensional presentation of the experimental findings. In FLN spectra the excitation step selects one or more subsets of molecules which are excited into the S₁ state. Such spectra depend intrinsically on the excitation wavenumber, and their interpretation is greatly facilitated by study of their contour plots. This technique is applied to oxazine-4-perchlorate in PVB, which shows a very broad inhomogeneous width in comparison to its vibrational spacings and which is therefore difficult to interpret with conventional one-dimensional methods.

Keywords

Excitation-emission matrix EEM Total luminescence spectroscopy TLS Fluorescence line-narrowing spectroscopy FLN Fluorescence Oxazine-4-perchlorate CAS #41830-81-3

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The Excitation-Emission Matrix in Fluorescence Line-Narrowing Spectroscopy: A Study of Oxazine-4-Perchlorate in Polyvinylbutyral

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