Influence of flux on structure and luminescence of LaMgB5O10: Ce3+, Mn2+

The influences of the flux KCl or KF on the XRD patterns, cell parameters, crystal morphology, and spectral properties of the phosphor LaMgB5O10: Ce3+, Mn2+ are studied. The results indicate that as 4.2%, 8.6%, 12.8% KCl and 5.3%, 10.5% KF are added individually into the phosphor (La0.85Ce0.15) (Mg0.9Mn0.1) B5O10, some peaks of the XRD patterns are intensified and cell volume's are-decreased. A small amount of Cu mono-crystal typed phase appears as more than 5% KCl is added. There are six hexagonal crystal-faces and eight triangular crystal-faces attributed to the {100} and {111} respectively. When 15% KCl is added into the phosphor, multi-faced regular crystals are formed and the crystal self-regulation appears.' The emission intensity of 5d -> 4f (F-2(5/2), F-2(7/2)) of Ce3+ and (4)G ->S-6 of Mn2+ increases up 3.41 and 2.36 times respectively.