Materials　with　multicolor　persistent　luminescence　(PersL)　are　desirable　in　color-on-demand　applications,　such　as　dark-light　multicolor　displays　and　white-emitting　persistent　light　sources.　However,　such　phosphors　with　long　afterglow　duration　and　high　afterglow　brightness　are　rarely　reported.　In　this　work,　a　color-tunable　PersL　phosphor-in-glass　(PiG)　was　achieved　via　a　radiation　energy　transfer　from　Sr2MgSi2O7:Eu2+,Dy3+　(SMS)　PersL　phosphor　to　Y3Al5O12:Ce3+　(YAG)　color-conversion　phosphor.　Impressively,　5　wt%　SMS　and　1.5　wt%　YAG　co　-doped　PiG　exhibits　an　afterglow　duration　of　44　h　and　an　afterglow　brightness　of　50.9　mcd/m2　60　min　after　Xe　lamp　light　charging,　close　to　those　of　the　commercial　SMS　phosphor.　Impressively,　the　PersL　color　of　the　PiGs　can　be　tuned　from　blue　to　yellow　by　simply　adjusting　the　YAG　content.　Our　results　will　provide　a　facile　and　effective　strategy　to　produce　multicolor　PersL　materials　for　practical　applications.