Photoacoustic spectra for rhodamine 6G-doped thin films. The arrows indicate the analyzed regions.
(a) Energy value at the onset to absorption and at the inflection point of the R6G absorption band (see Fig. 1). (b) Energy value at the inflection point of the absorption band.
Excitation and fluorescence spectra for a sol-gel film doped with rhodamine 6G at 0.10 mol % concentration. For the excitation spectrum, the emission photon energy was set at 2.06 eV, whereas fluorescence was measured by setting the excitation photon energy at 3.4 eV.
Curves (a)–(d) show the measured absorption spectra of thin films: (a) an undoped sol-gel film, (b) an undoped sol-gel film post annealed at 400 °C for six days in air, (c) a film doped with R6G at 0.01%, and (d) an undoped film prepared by magnetron sputtering. Curve (e) represents the theoretical spectrum for bulk rutile .
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