Green-emitting,　apatite　structure　of　Ca4-yLa6(AlO4)x(SiO4)6-xO1-x/2:　yEu2+　was　synthesized　by　using　the　high-temperature　solid-state　method　under　reducing　atmosphere　(90%N2–10%H2).　Corresponding　to　the　Eu2+　of　4f65　d1→4f7　transition　at　the　excitation　wavelength　of　335　nm,　a　broadband　emission　of　450–700　nm　showed.　Eu2+　lattice　selection　in　Ca4-yLa6(AlO4)x(SiO4)6-xO1-x/2:　yEu2+　phosphor　were　discussed　conjunction　with　apatite　crystal　structure　characteristics.　The　design　of　(AlO4)5-/(SiO4)4-　various　ratios　and　Eu2+　doping　concentration　improved　the　Eu2+　luminous　intensity　and　the　red-shift　of　optical　emission　spectra.　Energy　transfer　between　the　two　luminescent　centers　of　Eu(I)　and　Eu　(II)　happened,　and　clearly　distinguished　by　photoluminescence　decay　curves　monitored　at　480　nm　and　560　nm　with　the　average-lifetime　(τ)　of　Eu(I)　are　240.5　ns,　Eu　(II)　are　405.3　ns,　respectively.　The　temperature-dependent　emissions　along　with　blue-shift　phenomenon　were　addressed　through　the　transition　process　of　energy　level.　Eu(I)　and　Eu(II)　lattice　sites.　©　2021　Elsevier　B.V.