High-temperature　afterglow　(HTA)　materials　have　attracted　significant　attention　due　to　their　potential　applications.　However,　triplet　excitons　are　highly　susceptible　to　thermal　stimulation,　leading　to　rapid　deactivation,　which　limits　the　ability　of　organic　afterglow　materials　to　sustain　long　afterglow　emission　at　high　temperatures.　In　this　work,　a　universal　and　effective　strategy　is　proposed,　wherein　aromatic　carboxylic　acids　(AMA)　are　dissolved　in　a　hot　boric　acid　(BA)　solution,　followed　by　drying　and　melt　dehydration　processing,　successfully　synthesizing　a　series　of　HTA　materials.　The　BO　matrix　provides　a　rigid　and　thermally　stable　environment,　effectively　constraining　molecular　vibrations　and　preventing　non-radiative　transitions　of　triplet　excitons.　In　this　HTA　material,　both　triplet　hot　exciton　afterglow　(HEA)　and　thermally　activated　delayed　fluorescence　(TADF)　dual-mode　emission　are　realized,　along　with　tunable　afterglow　colors　from　blue　to　green.　TCPB@BO　demonstrates　visible　blue　afterglow　with　a　duration　of　0.5　s　and　a　long　lifetime　of　175　ms　at　543　K.　This　synthetic　strategy　not　only　expands　the　application　of　HTA　materials　in　anti-counterfeiting,　but　also　offers　protective　solutions　for　temperature　monitoring　in　electric　vehicle　batteries　and　chips　in　servers,　with　broad　application　prospects.　It　provides　an　innovative　approach　to　preventing　the　detrimental　effects　of　thermal　damage　in　high-tech　devices.　©　2025　Elsevier　B.V.