Organic　fluorescent　glassy　scintillators　hold　great　promise　for　security　screening　and　medical　imaging　due　to　their　excellent　optical　transparency　and　good　processability.　However,　their　limited　exciton　utilization,　particularly　the　inefficient　harvesting　of　75%　triplet　excitons,　restricts　radioluminescence　(RL)　efficiency　and　imaging　resolution.　Herein,　a　general　host-guest　doping　strategy　is　proposed　to　enhance　triplet　exciton　harvesting　and　scintillation　performance　in　organic　fluorescent　glass.　Specifically,　using　1,3-Bis(9H-carbazol-9-yl)benzene　(mCP)　as　a　glass-forming　host　and　doping　it　with　three　types　of　high　triplet-utilization　emitters　(HMB,　IrPA,　and　HXF),　the　obtained　HMB@mCPG,　IrPA@mCPG,　and　HXF@mCPG　glasses　exhibit　thermally　activated　delayed　fluorescence,　phosphorescence　and　delayed　fluorescence　from　inverted　singlet-triplet　gap,　respectively.　Compared　to　pristine　mCP　glass,　these　doped　glasses　exhibit　RL　intensity　enhancements　of　3.4-fold　(HMB@mCPG),　6.2-fold　(IrPA@mCPG),　and　3.4-fold　(HXF@mCPG),　respectively.　The　improvements　are　attributed　to　efficient　host-guest　energy　transfer,　which　enables　effective　harvesting　of　triplet　excitons　and　suppression　of　aggregation-induced　quenching　in　glassy　materials.　Furthermore,　all　samples　enable　X-ray　imaging　with　spatial　resolutions　exceeding　20　lp　mm-1,　with　HXF@mCPG　even　achieving　over　30　lp　mm-1.　This　work　highlights　a　versatile　and　effective　triplet-harvesting　strategy　for　advancing　the　performance　of　organic　glassy　scintillators,　paving　the　way　toward　high-resolution　X-ray　imaging　applications.