Traditional　solid-state　luminescent　materials　(e.g.,　phosphors　and　microcrystalline　glasses)　have　attracted　extensive　attention　due　to　their　high　energy　efficiency　and　long　lifespan.　However,　their　application　scope　is　limited　by　complex　compositions　and　manufacturing　processes,　as　well　as　single-function.　In　this　study,　solid-state　reaction　was　utilized　to　prepare　transparent-ferroelectric　(K0.5Na0.5)NbO3　(KNN)　ceramics　by　simply　codoping　with　Dy3+　and　Sr2+,　providing　possibilities　for　large-scale　production.　Ceramics　exhibit　high　optical　transmittance,　high-quality　white-light　emission　and　relaxor　ferroelectric　feature.　Under　irradiation　of　UV　light,　photochromic　behavior　occurring　in　the　ceramics,　resulting　in　modulating　the　optical　performances,　especially　quality　of　emitted　white　light.　Multifunctionality　can　expand　latent　applications　of　KNN-based　ceramics　from　white　light-emitting　diodes　to　modulated　optoelectronic　devices.