Photoluminescence properties of new deep red-emitting Mn2+-activated CaLaGa3S6O phosphors

A new deep red-emitting Mn2+-activated CaLaGa3S6O phosphor was prepared by using a solidstate reaction method. X-ray diffraction studies confirm a tetragonal structure with space group P21 m. The emission spectrum showed a broad band with an emission maximum at 676 nm under a host excitation of 332 nm. The optimum PL emission intensity was obtained at a concentration of 0.03 mole of Mn2+. The fluorescence lifetime of Mn2+ was calculated to be 0.368 ms for CaLaGa3S6O:0.03Mn2+. The Commission Internationale de I’Eclairage (CIE) chromaticity coordinates showed that the phosphors emissions were in the deep red region and were very near to the National Television Standards Committee (NTSC) standard values for red. Since the phosphor excitation lies in the near-UV excitable region, giving a deep red emission, it can be used for applications in near-UV phosphor converted white LED lighting and display devices.