Eu 2+ , Mn 2+ codoped BaMgAl10O17 (BAM) phosphors were synthesized using the method of solution combustion. Under the selective excitation at 306 nm, the emission spectra of the phosphors had a blue emission band at 450 nm and a green emission band at 513 nm. The energy transfer mechanism from Eu 2+ to Mn 2+ was clarified. The results indicated that the Eu 2+ ions replaced in the Ba 2+ sites and Mn 2+ ions occupied the Mg 2+ sites. The colour shift of phosphors under excitation of 306 nm was displayed at various concentrations of Mn 2+ ion.
The long afterglow phosphors CaAl 2 O 4 : Eu 2+ , Nd 3+ , RE 3+ (RE: Dy, Gd, Tb) were prepared by the combustion method at 580 C for 5 min. In this method, the B 2 O 3 oxide was used as flux. The influences of the flux B 2 O 3 quantity and the role of ion RE 3+ (RE: Dy, Gd, Tb) in the phosphor CaAl 2 O 4 : Eu 2+ , Nd 3+ were studied systemically. The X-ray diffraction pattern, scanning electron microscopy graphic, the photoluminescence spectra and decay time were presented. The emission spectra of phosphors had a broad band with maximum at 444 nm due to electron transition from the 4f 6 5d 1 to the 4f 7 of ion Eu 2+. It is showed that Nd 3+ and RE 3+ ions generated traps that resulted in the long persistent phosphorescence. Simultaneously, when the concentration of RE 3+ ion was high, they generated also emission centers in the phosphor.
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