In　this　letter,　Yb3+-Eu3　codoped　sol-gel　films　are　applied　to　the　surface　of　silica　microspheres.　Under　the　excitation　with　976　nm　laser,　we　observe　the　luminescence　of　Eu3　with　relatively　low　pump　power.　The　Yb3　→　Eu3　energy　transfer　process　and　the　pump　power　dependence　are　studied.　Because　of　high　energy　density　of　the　Yb　3+-Eu3+　codoped　microsphere　(YECM),　the　threshold　power　for　the　downconversion　(Yb3+:2F5/2　→　2　F7/2)　laser　is　as　low　as　8.99　μW.　In　addition,　a　self-stimulated　cascaded　Raman　laser　(SSCRL)　is　observed,　which　is　stimulated　by　the　down-conversion　laser　of　the　YECM.　©　1989-2012　IEEE.