Concentration quenching and thermal stability of Eu2+ emission in green emitting phosphor Li2BaSiO4: Eu2+

A broad-band green emitting phosphor Li2BaSiO4: Eu2+ was synthesized by solid-state method. Under UV light excitation, Li2BaSiO4: Eu2+ phosphors exhibit a green emission peaking at 505 nm with a full width at half maximum ~61 nm, and CIE coordinates of Li2BaSiO4: Eu2+ are (0.174, 0.539). The critical quenching concentration of Eu2+ in Li2BaSiO4 was about 0.01 and the value of the critical transfer distance was calculated to be about ~26 Å. The corresponding concentration quenching mechanism was verified to be the dipole-dipole interaction. Li2BaSiO4: Eu2+ phosphor remaining 80% photoluminescence emission intensity at 100 °C and 63% at 200 °C with activation energy of 0.158 eV. Thus, This phosphor finds potential application as converted phosphor in NUV LED devices.