The　high　quality　LaxCe1　B-x(6)　(x　=　0,　0.2,　0.4,　0.6,　1)　single　crystals　with　large　emission　current　density　have　been　successfully　grown　by　floating　zone　method.　The　crystal　structure,　crystal　quality　and　emission　properties　of　LaxCe1　B-x(6)　single　crystals　were　characterized　by　360　degrees　Phi　scanning　single　crystal　diffractometer,　X-ray　Laue　diffraction　and　the　thermal　electron　emission　measurements.　It　is　found　that　the　as-grown　crystals　have　a　good　crystal　quality　without　subgrains　and　twin　crystal　phenomenon.　The　thermionic　emission　measurement　results　show　that　the　maximum　emission　current　density　on　(100)　surface　of　La0.2Ce0.8B6　single　crystal　is　71.2　A/cm(2)　at　1873　K　under　an　applied　voltage　of　800　V,　which　is　larger　than　the　reported　values　in　the　literatures　up　to　now.　Furthermore,　the　crystals　with　different　components　also　show　a　higher　emission　current　density　such　as　53.8A/cm(2)　for　La0.4Ce0.6B6　and　53.3　A/cm(2)　for　CeB6　single　crystals.　The　field　emission　single　tip　made　by　LaB6　single　crystal　shows　a　superior　performance　than　the　polycrystalline　LaB6　field　emission　tip　and　its　field　enhancement　factor　(beta)　is　36,231　cm　(1).　Thus,　the　LaxCe1　B-x(6)　single　crystals　will　have　promising　application　prospects　as　a　hot　or　cold　cathode.　(C)　2012　Elsevier　B.V.　All　rights　reserved.