The　development　of　electrochemiluminescence　(ECL)　emitters　over　a　broad　spectrum　of　wavelengths　is　anticipated　for　the　multiplexed　ECL　sensing　and　diagnostic　application.　Herein,　a　facile　dual-stabilizers-capped　strategy　was　developed　for　synthesizing　a　series　of　water-soluble　CdSe　nanocrystals　(NCs)　with　strong,　bandgap　engineered　and　monochromatic　ECL　emissions　in　greenish　region.　The　linkage　of　surface　cadmium　atoms　to　the　dual　stabilizers,　mercaptopropionic　acid　and　sodium　hexametaphosphate,　not　only　can　effectively　remove　the　nonradiative　surface　state　and　deep　surface　trap　of　CdSe　NCs　for　improved　ECL　efficiency　and　monochromaticity,　but　is　also　favorable　for　the　electrochemical　involved　electron　and　hole　injection　processes　for　higher　ECL　intensity.　ECL　spectra　of　dual-stabilizers-capped　CdSe　NCs　are　narrow　and　much　close　to　corresponding　photoluminescence　spectra,　which　indicates　a　series　of　bandgap　engineered　and　monochromatic　ECL　emitters.　The　ECL　signal　of　dual-stabilizers-capped　CdSe　NCs　also　shows　acceptable　accuracy　and　precision　for　the　detection　of　dopamine　concentration　in　the　practical　drug　(dopamine　hydrochloride　injection).　(C)　2013　Elsevier　B.V.　All　rights　reserved.