In this work, we have developed a new strategy of organic scintillators to achieve excellent comprehensive performance of RL. This kind of scintillators overcomes the Additionally, we developed a novel strategy based on through-space heavy atom-π interactions for chemically modifying HLCT emitters. Thanks to the numerous spatial interactions between bromine atoms and π-electrons, BTD-HeBr shows short radiative lifetime (3.74 ns), high PLQY (100%), RISC rate (2.63×10 8 s -1 ), small nonradiative decay (3.8×10 5 s -1 ) and X-ray absorption cross-section in the aggregate state. The through-space-heavy-atom HLCT scintillators exhibit highly improved scintillation performance (light yield of ~42,400 photons MeV -1 , narrow FWHM of 56 nm, and detection limit of 84.6 nGy s -1 ). In addition, a transparent screen can be obtained by melting glassy films of BTD-HeBr to obtain ultrahigh X-ray imaging resolution of > 40.0 lp mm -1 , exceeding the resolution of all the reported organic and commercial scintillators. We believe that the present findings will serve as a benchmark for the fabrication of efficient organic scintillators in real-life applications, including medical and security screening from materials beyond high-cost metal complexes and perovskites by using a simple through-space-heavy-atom strategy on HLCT emitters.