Quantum　dots　(QDs)　materials　are　rapidly　developing　in　the　field　of　electrochromic　devices　due　to　their　excellent　monochromatic　properties　and　tunable　luminescence.　In　this　paper,　we　investigate　the　physical　method　of　reducing　the　growth　time　of　QDs　by　diluting　the　concentration　of　monomer　with　solvent　during　the　growth　of　QDs　nuclei,　which　can　change　the　luminescence　wavelength　of　QDs　without　changing　the　chemical　composition　ratio.　Further　modulation　of　the　luminescence　wavelength　is　achieved　by　growing　the　ZnSe　and　ZnSeS　shell　layers,　resulting　in　green　QDs　with　a　photoluminescence　wavelength　of　540　nm.　The　principle　of　color　change　is　explained　by　comparative　experiments　as　well　as　by　the　LaMer　model.　The　luminescence　peak　position　of　QDs　can　be　controlled　only　by　interfering　with　the　growth　phase　of　the　nucleus.　We　also　found　that　increasing　the　cladding　temperature　of　the　QDs　shell　had　a　positive　effect　on　the　reduction　of　defects　in　the　QDs.　The　obtained　QDs　were　subsequently　used　to　prepare　quantum　dot　electroluminescent　devices,　and　a　brightness　of　348993　Cd/m2　and　a　current　efficiency　of　32　Cd/A　were　obtained　at　8　V.　In　addition,　the　method　can　provide　new　ideas　for　the　preparation　of　other　types　of　nanomaterials　prepared　by　the　thermal　injection　method.　©　2023　Science　Press.　All　rights　reserved.