Divalent　europium-activated　chlorosilicate　Ca　6Sr　4(Si　2O　7)　3Cl　2:Eu　2+　phosphors　were　synthesized　by　a　conventional　solid-state　reaction　under　reductive　atmosphere.　These　phosphors　can　be　efficiently　excited　by　UVvisible　light　from　320　to　420　nm,　which　matches　that　of　a　near　UV-emitting　InGaN　chip.　Under　the　360　nm　excitation,　Ca　6Sr　3.97(Si　2O　7)　3Cl　2:0.03Eu　2+　phosphor　shows　a　strong　and　broad　emission　centering　at　515　nm,　which　is　attributed　to　the　5d→4f　transition　of　Eu　2+　ion.　The　mechanism　of　concentration　quenching　was　determined　to　be　the　dipoledipole　interaction　and　the　critical　energy-transfer　distance　of　Eu　2+　was　calculated　as　3.31　nm.　The　CIE　chromaticity　coordinates　of　Ca　6Sr　3.96(Si　2O　7)　3Cl　2:0.03Eu　2+　phosphor　are　(0.127,　0.770)　according　to　the　emission　spectrum.　It　can　be　expected　that　Ca　6Sr　4(Si　2O　7)　3Cl　2:Eu　2+　phosphor　is　a　promising　candidate　as　the　green　component　for　near-ultraviolet　InGaN-based　white　LED.