C　and　O　doped　BN　nanoflakes　and　hybrid　nanoflake-nanowire　structures　were　synthesized　in　N-2+H-2　environment　using　plasma-enhanced　hot　filament　chemical　vapour　deposition　with　solid　B4C　as　boron　and　carbon　precursor.　Structure　and　chemical　composition　of　the　C　and　O　doped　BN　nanoflakes　and　hybrid　nanoflake-nanowire　hybrid　structures　were　systemically　studied　using　advanced　characterization　instruments　including　high　resolution　transmission　electron　microscope,　micro-Raman　spectroscope,　Fourier　transform　infrared　spectroscope,　X-ray　diffractometer,　field　emission　scanning　electron　microscope,　and　X-ray　photoelectron　spectroscope.　The　obtained　results　evidence　that　the　C　and　O　doped　BN　nanowires　nucleate　and　grow　directly　on　the　tops　of　C　and　O　doped　BN　nanoflakes　due　to　the　presence　of　dangling　bonds　on　the　surfaces　of　tips　of　C　and　O　doped　BN　nanoflakes,　which　were　formed　by　the　ion　bombardment　in　plasma.　The　photoluminescence　(　PL)　properties　of　C　and　O　doped　BN　nanoflakes　and　C　and　O　doped　BN　nanoflake-nanowire　hybrid　structures　were　studied　at　room　temperature　using　a　micro-Raman　system　with　the　325　nm　line　of　He-Cd　laser　as　the　excitation　source.　The　results　of　PL　measurements　indicate　that　the　PL　properties　of　C　and　O　doped　BN　nanoflake-nanowire　hybrid　structures　significantly　change　with　the　length　of　C　and　O　doped　BN　nanostructures　due　to　the　interface　zones　caused　by　the　nanowire　length.　Thus,　the　PL　properties　can　be　efficiently　tuned　by　the　length　of　nanowires.　These　achievements　can　contribute　to　the　synthesis　of　novel　BN-based　hybrid　nanostructures　and　the　development　of　the　next　generation　BN-based　optoelectronic　nanodevices.　(C)　2017　Elsevier　B.V.　All　rights　reserved.