Inkjet　printing　technology　of　perovskite　quantum　dots（PQD）hold　great　potential　in　full-color　display　applications，but　several　key　issues　still　affect　their　efficiency，such　as　unbalanced　charge　carrier　injection，low-quality　perovskite　films，and　non-radiative　recombination　pathways　of　PQDs　themselves.　To　address　these　issues，we　introduce　an　interface　improvement　layer　of　Phenethylammonium　bromide（PEABr）to　balance　the　charge　carrier　transport　in　devices.　PEABr　has　a　similar　structure　to　the　binary　solvent　of　perovskite（toluene，naphthalene），which　can　improve　the　printing　characteristics　and　film-forming　ability　of　PQDs　and　effectively　passivate　the　Br-　vacancies　and　interface　defects　of　PQD　films.　Based　on　this　strategy，we　successfully　achieved　inkjet-printed　perovskite　quantum　dot　light-emitting　diodes（PeLEDs）with　a　maximum　external　quantum　efficiency（EQE）of　8.　82%　and　a　current　efficiency（CE）of　29.　15　cd/A　at　a　brightness　of　414　cd/m2，providing　beneficial　insights　for　inkjet　printing　technology　in　future　display　applications.　©　2024　Editorial　Office　of　Chinese　Optics.　All　rights　reserved.