Effect of Flux on Properties of Structure and Luminescence of LaMgB_5O_(10)∶Ce^(3+), Mn^(2+)

The influences of the flux KCl or KF on the XRD spectra, cell parameters and crystal appearance, and spectral properties of the phosphor LaMgB_5O_(10)∶Ce^(3+), Mn^(2+) were studied. The results indicate that when 4.2%, 8.6%, 12.8% KCl and 5.3%, 10.5%KF are respectively added into phosphor (La_(0.85)Ce_(0.15)) (Mg_(0.9)Mn_(0.1))B_5O_(10), compared with the normal card of JCPDS (No 35-120), the intensity of XRD spectra is enhanced, the values corresponded to 17/28, 18/28, 16/28, 18/28 and 2/28 and the cell parameters diminish because of the flux KCl and KF. The use of 5% KCl a fraction of Cu monocrystals are observed in the phosphor. There are six hexagonal crystal-faces and eight triangular crystal-faces representing crystal-face index {100} and {111}. When 15% KCl is added to the phosphor, law of crystal plane and self-regulaton are formed, the emission intensity of Ce^(3+) 5d-4f ((()~2F_(5/2),) (()~2F_(7/2))) and Mn^(2+) ((()~4G) and (()~6S)) increases by 3.41 times and 2.36 times respectively.