Crystal structure characterization and up-conversion luminescent properties of BaIn2O4 phosphor.

Er 3+ / Yb 3+ doped BaIn 2 O 4 up-conversion (UC) phosphors are synthesized and their UC luminescent properties are characterized. BaIn 2 O 4 has P 21 /c space group but Rietveld refinement suggests it has twice smaller cell parameter (a = 10.3975 Å, b = 5.8295 Å, c = 14.4457 Å) and volume than previous reported structure. Refinement also reveals Er 3+ /Yb 3+ replaces In 3+ ions in lattice because of the existence of InO 6 octahedra. In these BaIn 2 O 4 phosphors, co-doping with Yb 3+ ions changes the predominant UC emission from green ( 2 H 11/2 , 4 S 3/2 → 4 I 15/2 of Er 3+ ) to red (about 665 nm, 4 F 9/2 → 4 I 15/2 of Er 3+ ). By controlling of Er 3+ /Yb 3+ concentrations, the BaIn 2 O 4 phosphors have the potential of generating various UC spectra and color tunability. The pumping powers study shows two-photon process in these phosphors. [ABSTRACT FROM AUTHOR]