Concentration quenching of Eu2+ in Ba2LiB5O10:Eu2+ phosphor

An intense orange-reddish-emitting phosphor, Eu2+ doped Ba2LiB5O10 was prepared by solid-state reactions. The excitation spectrum showed a broad band from 250 nm to 400 nm with an intense peak at 322 nm. Under the excitation of 322 nm, the emission band showed one large broad band peaking at about 590 nm with full width at half maximum of 128 nm, which corresponds to the 4f65d1→4f7 transition of Eu2+. The critical quenching concentration of Eu2+ in Ba2LiB5O10:Eu2+ phosphor was about 3 mol%. The corresponding concentration quenching mechanism was verified to be a dipole–dipole interaction. The value of the critical transfer distance was calculated to be about 19 Å. The CIE coordinate (x, y) did not change from the value (0.54, 0.35) observed for 3 mol% of Eu2+ when Eu2+ concentration was changed.