Recently,　perovskite　quantum　dots　(PQDs)　were　employed　as　promising　emitters　in　light-emitting　diode　devices　(LEDs)　mainly　owing　to　their　marvelous　photoelectronics　properties.　However,　these　perovskite　QLEDs　suffered　from　the　inefficient　performance,　especially　their　serious　efficiency　roll-off　probably　due　to　the　exciton　recombination　dynamic　in　the　interface　of　PQDs　films　and　charge　imbalance　resulting　from　low　electrical　transportation.　Herein,　sodium　dodecyl　sulfate　(SDS)　was　effectively　introduced　to　synthesize　PQDs　with　many　excellent　properties　and　eventually　suppressed　the　efficiency　roll-off　of　QLEDs.　SDS-based　PQDs　films　exhibited　obviously　enhanced　radiative　recombination,　reduced　trap　density,　and　increased　carrier　mobility,　especially　the　transportation　of　electrons.　Therefore,　the　charge　carrier　was　balanced　at　high　current　density　together　with　the　remarkably　suppressed　efficiency　roll-off.　QLEDs　fabricated　by　SDS-capped　PQDs　exhibited　significantly　improved　maximum　brightness　of　193,810　cd/m2,　and　achieve　the　external　quantum　efficiency　of　10.13%.　More　importantly,　the　EQE　roll-off　of　QLED　optimized　in　the　thickness　of　emitting　layer　was　only　1.5%　at　the　current　density　of　200　mA/cm2,　representing　a　prominent　achievement　of　our　strategy.　©　2021　Elsevier　Ltd