The　electrogenerated　chemiluminescence　(ECL)　of　two　water-insoluble　iridium(III)　complexes　(pq)2Ir(acac)(pq　=　2-phenyl　quinolone　anion,　acac　=　acetyl　acetonate)　and　(ppy)2Ir(acac)(ppy　=　2-phenylpyridine　anion)　in　carbon　nanotube　(CNT)/Nafion　composite　films　was　investigated　at　a　glassy　carbon　(GC)　electrode.　CNT　and　Nafion　play　significant　roles　in　the　iridium(III)　complexes　immobilization.　The　excellent　chemical　stability　and　electrical　conductivity　of　CNT　promote　electron　transfer.　The　experimental　conditions,　such　as　potential,　pH,　concentrations　of　CNT　and　various　coreactants　were　investigated.　The　iridium(III)　complexes　modified　electrode　had　good　stability　and　reproducibility.　In　our　work,　the　(pq)2Ir(acac)/DBAE　(2-(dibutylamino)ethanol)　system　was　used　to　detect　the　codeine,　one　of　the　many　narcotics,　and　the　detection　limit　was　0.05　μM　(S/N　=　3).　This　method　enabled　the　two　water-insoluble　iridium(III)　complexes　to　be　used　for　the　determination　of　the　analyte　in　aqueous　solution.　©　2013　Elsevier　B.V.　All　rights　reserved.