Role of Fluxes in the Synthesis and Luminescence Properties of Ba sub(3) Si sub(6) O sub(12) N sub(2):Eu super(2+) Oxynitride Phosphors by Microwave Sintering

Eu super(2+) activated Ba sub(3) Si sub(6) O sub(12) N sub(2) oxynitride green phosphors were synthesized by microwave sintering method with the aid of fluxes, namely BaCl sub(2), H sub(3) BO sub(3), KF, and NH sub(4) F. We employed a combination of X-ray diffraction, photoluminescence spectra and scanning electron microscopy measurements, in conjunction with detailed quantum efficiency(QE), life time and thermal quenching studies of luminescence properties to understand the origins of the improved luminescence properties. The results showed that the photoluminescence intensity of the phosphors was increased obviously by using varied fluxes and the intensity rise was recorded in order of fluxes as following: H sub(3) BO sub(3)> KF > BaCl sub(2)> no flux > NH sub(4) F. The maximum emission intensity of the Ba sub(3) Si sub(6) O sub(12) N sub(2):Eu super(2+) phosphor was achieved at containing 1.0wt% H sub(3) BO sub(3), due to the high crystallinity, narrow particle-size distribution and smooth surface, which s