A　series　of　Dy3+-doped　LaMgAl11O19　(Dy:　LMA)　phosphors　were　prepared　by　the　solid　state　reaction　method.　The　band　structure　and　density　of　states　of　LaMgAl11O19　were　calculated.　The　crystalline　structures　were　investigated　by　X-ray　diffraction　and　transmission　electron　microscopy.　The　chemical　elements　of　Dy:　LMA　phosphors　were　characterized　by　energy　dispersive　X-ray　spectroscopy　and　X-ray　photoelectron　spectroscopy.　All　the　Dy:　LMA　phosphors　exhibit　intense　yellow　emissions　at　573　nm　under　the　excitation　of　449　nm.　Based　on　the　measured　absorption,　emission　spectra　and　the　fluorescence　decay　curves,　as　well　as　the　discussion　and　comparison　of　their　spectral　parameters,　the　optimal　doping　concentration　of　Dy3+　in　LMA　is　confirmed　to　be　4　at.%.　The　Com-mission　International　del-Eclairage　(CIE)　1931　chromaticity　coordinates　of　all　the　samples　were　located　in　the　yellow　region.　The　mechanism　of　concentration　quenching　of　Dy3+　in　LMA　was　discussed.