Cyan　phosphors　have　attracted　considerable　attention　in　recent　years　as　an　indispensable　component　for　realizing　full-spectrum　lighting.　In　this　study,　a　novel　nitride-based　cyan-emitting　phosphor　Ca2BN2Cl:Eu2+was　successfully　prepared.　Its　crystal　structure　refined　by　the　Rietveld　refinement　reveals　that　Ca2BN2Cl　is　formed　by　a　tight　host　lattice　and　the　edge-sharing　Ca(N,Cl)4tetrahedrons　along　with　multiple　crystallographic　Ca　sites　for　Eu2+ions　to　occupy,　which　corresponds　to　its　broad　emission　band.　Under　the　near　ultraviolet　(NUV)　light　excitation,　Ca2BN2Cl:Eu2+emits　a　broad-band　cyan　light　and　its　full　width　at　half-maximum　(FWHM)　can　reach　121　nm,　which　effectively　compensates　the　＇cyan　cavity＇.　The　time-resolved　photoluminescence　(TRPL)　spectra　of　Ca2BN2Cl:Eu2+were　investigated　to　expose　the　energy　transfer　between　the　multiple　luminescent　centers.　Furthermore,　the　temperature-dependent　spectra　of　Ca2BN2Cl:Eu2+were　measured　to　evaluate　its　thermal　stability.　All　of　the　discussion　and　results　reveal　that　Ca2BN2Cl:Eu2+is　a　promising　cyan　phosphor　for　use　in　white　light-emitting　diodes　to　realize　full-spectrum　lighting.　©　The　Royal　Society　of　Chemistry　2021.