Room　temperature　phosphorescence　(RTP)　materials　have　motivated　massive　attention　due　to　their　great　advantages　in　anti-counterfeiting　and　optical　encryption.　However,　the　commonly　used　carbon-based　RTP　materials　suffer　from　drawbacks　of　photobleaching,　quenching　and　single　phosphorescence　color　outputs,　which　obstruct　their　performance　in　high-level　anti-counterfeiting　techniques.　Herein,　we　present　a　universal　method　for　the　fabrication　of　a　carbon-dot@silica　(CDs@SiO2)　composite　that　possesses　ultralong　lifetime,　high　phosphorescence　quantum　efficiency　(PQE),　excellent　luminescence　stability,　and　dual-color　phosphorescence　emission.　Taking　advantage　of　the　restriction　by　rigid　network　of　SiO2　and　stable　covalent　bonding　between　CDs　and　SiO2,　the　triplet　excited　states　of　CDs　are　stabilized.　As　a　result,　the　CDs@SiO2　exhibit　ultralong　lifetime　of　1.33　s　and　0.38　s　under　excitation　at　254　nm　and　365　nm,　respectively.　Furthermore,　the　phosphorescence　color　of　CDs@SiO2　can　change　from　cyan　to　yellow　when　the　exciting　wavelength　switches　from　254　nm　to　365　nm.　The　obtained　CDs@SiO2　also　exhibit　outstanding　characteristics　of　anti-photobleaching　and　phosphorescence　stability　in　an　aqueous　solution.　Based　on　the　unique　phosphorescent　properties　of　the　CDs@SiO2,　a　stable　and　dual-color　phosphorescence　security　label　is　designed　for　advanced　information　encryption.　©　2022