Carbazole　and　carbazole-related　compounds　have　been　studied　for　their　unique　electrical,　electrochemical　and　optical-physical　properties　in　the　past　decades.　This　kind　materials　are　typical　hole　transporting　unit　due　to　the　electron　donating　character　and　can　be　easily　modified　with　electron　transport　units　in　different　position.　Thereby,　the　injection　of　electrons　and　holes　simultaneously　into　deep　blue　emitters　becomes　more　facility,　meanwhile,　there　is　a　good　balance　between　electrons　and　holes.　It　is　believed　that　carbazole　and　carbazole-related　compounds　have　great　promise　as　photoelectric　functional　materials　for　their　photo-physical　and　fluorescent　properties　in　the　blue　light　region.　Carbazole　and　carbazole-related　compounds　not　only　can　be　used　as　small　molecular　in　fluorescence　materials,　phosphorescence　materials　and　thermally　activated　delayed　fluorescence　materials,　but　also　as　high　molecular.　Recently,　the　syntheses　of　carbazole　and　carbazole-related　materials　and　their　applications　have　become　the　highlight　in　blue　emitting　organic　light-emitting　diodes.　In　this　review,　we　summarize　recent　progress　of　small　molecular　carbazole　and　carbazole-related　materials　as　organic　light　emitting　materials.　The　molecular　design　concept,　the　electric　structure,　optical　physical　properties,　thermal　stability,　electrochemical　properties　and　the　properties　of　carbazole-based　OLEDs　are　reviewed　as　well.Meanwhile,　carbazole-containing　polymers　OLED　materials　also　be　discussed.　At　last,　the　perspectives　of　foreseeable　future　and　trend　of　development　of　carbazole-based　OLEDs　are　also　presented.　Considering　the　conversion　efficiency　of　electrical-to-optical　and　the　cost　of　OLED,　thermally　activated　delayed　fluorescence　(TADF)　and　polymer　light-emitting　materials　(containing　carbazole-based　groups)　are　most　attractive　tendency　to　blue　OLEDs.　©　2015,　Editorial　Office　of　Progress　in　Chemistry.　All　right　reserved.