Electrohydrodynamic　(EHD)　printing　is　a　promising　method　for　manufacturing　high-resolution　quantum　dot　light-emitting　diodes　(QLEDs).　The　stability　of　the　EHD　printing　process　and　the　morphology　of　final　quantum　dot　(QD)　film　are　highly　dependent　on　the　ink　formulation.　To　solve　this　problem,　we　selected　a　ternary　solvent　(decahydronaphthalene,　tetradecane　and　nonane)　ink　for　cadmium-based　QDs　(CdSe/ZnS)　to　achieve　excellent　QD　dispersion　while　eliminating　the　＇coffee　ring＇effect,　resulting　in　high　quality　QD　films.　We　also　fabricated　a　complete　QLED　device　by　printing　a　light-emitting　layer　formed　by　linearly　aligned　strips　of　QDs,　achieving　an　external　quantum　efficiency　(EQE)　of　19.2　%,　which　is　one　of　the　highest　levels　of　printing　devices.　On　this　basis,　we　introduced　patterned　PMMA　structures　prepared　by　nanoimprinting　method　to　achieve　ultrahigh　resolu-tion　devices.　The　pixel　density　achieved　was　8,758　pixels　per　inch　(PPI),　with　a　maximum　EQE　of　10.5　%.　The　luminance　is　9530.43　cd/m2　at　a　voltage　of　4　volts.　This　work　shows　promising　potential　in　realizing　ultra-high　resolution　and　high-performance　QLEDs.　©　1980-2012　IEEE.