Optical Properties of Rhodamine 6G Doped AlPO₄ Gel

Homogeneous monolith of AlPO₄ gel doped with rhodamine 6G (Rh6G) at different dye loadings is prepared by a one−step process with sol-gel method using the precursors Al(lact)₃ and H₃PO₄. The optical properties of AlPO₄ gel doped with Rh6G are characterized by UV−Visible absorption spectra and fluorescence spectra. Rh6G molecular J-dimers and H-dimers even multimers are analyzed by excitation spectra based on exciton theory. The AlPO₄ gel doped with Rh6G dye with molar ratio of Rh6G/Al(lact)₃ of 1×10⁻⁴ has excellent optical properties without obvious aggregates.