Color　conversion　layers　are　extensively　utilized　in　flat　panel　display　technology　for　their　capacity　to　provide　a　wide　color　gamut　and　improved　resolution,　along　with　exceptional　design　flexibility.　The　uniformity　and　thickness　of　cadmium　selenide　(CdSe)　quantum　dot　(QD)　films　are　often　difficult　to　control　in　the　preparation　of　color　conversion　layers.　Interestingly,　it　is　possible　to　precisely　deposit　QDs　by　inkjet　printing　to　improve　material　utilization.　Color　conversion　layers　with　optimized　spectral　properties　and　light　conversion　efficiency　are　successfully　prepared　by　inkjet　printing.　We　employ　inkjet　printing　technology　to　fabricate　CdSe　QD　color　conversion　layers　with　precise　control　over　layer　thickness.　The　effects　of　layer　thickness　on　spectral　properties　and　light　conversion　efficiency　are　systematically　investigated.　It　is　found　that　a　layer　thickness　of　5.5　μm　achieves　the　highest　light　conversion　efficiency　at　20.4%,　with　efficiency　decreasing　as　thickness　increases　to　6　μm.　In　addition,　it　is　observed　that　blue　light　transmittance　decreases　from　47.2%　to　11.4%　with　increasing　layer　thickness,　highlighting　the　importance　of　thickness　control　in　optimizing　spectral　properties.　©　2025　Society　of　Photo-Optical　Instrumentation　Engineers　(SPIE).