The　lead-free　0.985(K0.5Na0.5)　NbO3-0.015ErBiO(3)　(KNN-EB-0.015)　ceramic　was　fabricated　by　pressureless　sintering.　It　possessed　a　pure　perovskite　phase　with　pseudo-cubic　symmetry.　Due　to　the　fine-grains,　small-sized　pores,　dense　microstructure　and　relaxor-like　characteristics,　the　ceramic　was　optically　clear,　exhibiting　the　highest　transmittances　of　similar　to　40%　and　similar　to　71%　in　the　visible　and　infrared　regions,　respectively.　The　photoluminescence　(PL)　properties　of　the　ceramic　were　studied,　including　the　up-conversion　(UC)　green　and　red　emissions,　down-conversion　near　infrared　emission　as　well　as　the　emission　lifetimes.　The　color-tunable　(from　green　to　yellow)　UC　emissions　were　observed　by　increasing　the　temperature,　based　on　the　temperature-dependent　emission　spectra,　which　also　exhibited　good　thermal　stability　(52.6%　of　the　initial　intensity　at　453　K)　of　the　ceramic.　Additionally,　the　temperature　sensing　properties　were　investigated　using　the　fluorescence　intensity　ratio　technique.　A　maximum　sensitivity　of　similar　to　0.0048　K　at　603　K　was　obtained.　Combined　with　the　good　optical　and　electrical　properties,　the　KNN-EB-0.015　transparent　ceramic　could　be　a　promising　candidate　for　multifunctional　optoelectronic　applications.　(C)　2017　Elsevier　B.V.　All　rights　reserved.