White-light　emission　has　evoked　great　attention　as　one　of　the　most　promising　technologies　in　the　applications　of　solid-state　lighting　devices,　light　emitting　diodes,　and　flat-panel　displays.　However,　up　to　now,　pure　white-light　emitting　materials　have　rarely　been　reported.　Here,　we　present　a　single-component　white-light　emitting　semiconductor,　[C5H9-NH3](4)CdBr6,　which　exhibits　CIE　chromaticity　coordinates　of　(0.33,　0.33).　Notably,　this　value　is　the　same　as　that　of　the　standard　pure　white-light　emission.　Remarkably,　it　shows　an　ultrahigh　color　rendering　index　of　92.5,　which　exceeds　that　of　mixed-phosphor　light　sources　and　is　comparable　to　the　recently　reported　highest　one　among　single-component　materials.　Mechanistic　studies　indicate　that　the　white-light　emission　originates　from　the　synergetic　effect　of　deep　defects　coupled　with　the　organic　component.　Such　an　organic-inorganic　hybrid　with　outstanding　color　characteristics　will　pave　a　new　approach　in　the　development　of　white-light　emitting　materials　with　practical　applications.