Er3+-doped　xK0.5Na0.5NbO3-(1-x)Ba0.85Ca0.15Ti0.9Zr0.1O3　(x　=　0.04,　0.05,　0.06　and　0.07)　translucent　ceramics　have　been　first　prepared　by　conventional　pressureless　sintering.　Owing　to　the　effective　suppression　of　grain　growth　induced　by　both　Er3+　and　K0.5Na0.5NbO3,　the　ceramics　possess　dense　and　fine-grained　microstructure.　The　XRD　patterns　demonstrate　cubic-like　phase　structure　with　minimal　optical　anisotropy.　The　ceramics　perform　good　photochormic　(PC)　properties　under　407-nm　light　irradiation　and　superior　reproducibility　after　heat　treatment　(200　°C,　5　min).　And　PC　reaction　is　responsible　for　coloration　and　decoloration　processes.　The　up-conversion　photoluminescence　before　and　after　irradiation　have　been　studied.　With　increasing　the　K0.5Na0.5NbO3　content　or　elevating　the　sintering　temperature　of　the　ceramics,　the　luminescent　quenching　degree　(ΔRt)　gradually　increases.　The　color　centers　induced　by　irradiation　can　be　reversibly　created　or　eliminated,　resulting　in　invertible　luminescent　modulations.　This　work　can　guide　other　multifunctional　PC　transparent　ferroelectric　materials　for　optoelectronic　applications.　©　2019　Elsevier　Ltd　and　Techna　Group　S.r.l.