We　have　synthesized　monodispersed　Au-25　nanoclusters　(NCs)　stabilized　with　eco-friendly　glutathione　and　report　here　an　insight　into　their　interactions　with　dye　molecules.　In　the　presence　of　such　gold　NCs,　consistent　fluorescence　quenching　was　observed　for　all　the　dye　molecules　that　we　examined　in　this　study　regardless　of　their　maximum　emission　wavelengths.　The　steady-state　and　time-resolved　spectroscopic　results　demonstrate　that　the　weakened　luminance　is　associated　with　the　protective　ligand　pertaining　to　a　static　quenching　mechanism.　Having　expounded　this　issue,　we　further　employed　proper　laser　irradiation　enabling　dissociation　of　Au-25(SG)(18)　so　as　to　attain　a　transformation　of　nonplasmonic　NCs　into　plasmonic　gold　nanoparticles　(NPs)　via　photo-assisted　aggregation　of　the　dissociated　gold　clusters.　As　a　result,　emission　enhancement　for　these　dyes　was　observed,　which　is　largely　attributed　to　the　local　electromagnetic　field　enhancement　of　gold　NPs.　The　alternation　of　fluorescence　quenching　to　emission　enhancement　reflects　an　accommodation　of　quantum　size　effects　upon　the　ligand-stabilized　gold　clusters.