The　high-quality　Praseodymium　hexaboride　(PrB6)　single　crystal　was　successfully　grown　by　a　floating　zone　method　using　PrB6　powders　as　starting　materials.　The　XRD　pattern　and　single　crystal　diffractometer　confirmed　that　the　high-quality　PrB6　single　crystal　could　be　successfully　obtained.　The　theoretical　calculation　results　show　that　the　d　orbital　electrons　of　Pr　atoms　contribute　the　electron　emission　of　PrB6.　Thermionic　emission　test　results　show　that　the　work　function　of　single　crystal　PrB6　(100)　surface　is　2.73　eV.　The　field　emission　study　shows　that　a　field　emission　current　of　8.2　mu　A　was　drawn　at　the　electric　field　of　8.8　V/mu　m　from　the　single　tip　corroded　by　PrB6　single　crystal.　Thus,　the　PrB6　single　crystals　could　have　potential　application　prospect　as　a　thermionic　and　field　emission　cathode　material.　(C)　2018　Elsevier　Ltd.　All　rights　reserved.