Luminescent characteristics of green emitting Li2Ca2Si2O7:Eu2+ phosphor

We present a novel green emitting phosphor of Eu2+-doped Li2Ca2Si2O7 which can be excited by ultra-violet light. The phosphors were synthesized at the low temperature of 900 °C without any impurity phases by a solid-state reaction. The phosphor shows broad green emission centered at 520 nm under excitation at 350 nm. We found in the phosphor that the critical quenching concentration of Eu2+ and the critical distance of energy transfer between Eu2+ ions are 0.5 mol% and 56.2 Å, respectively. The thermal activation energy of the green luminescence was also measured to be 0.51 eV. The present work suggests that the Li2Ca2Si2O7:Eu2+ phosphor is a kind of potential green-emitting phosphor.

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► The successful synthesis of a novel Li2Ca2Si2O7:Eu2+ green emitting phosphor
► Broad green emission centered at 520 nm and broad excitation band near UV area
► Analysis of optical properties of the Li2Ca2Si2O7:Eu2+ phosphor
► The Li2Ca2Si2O7:Eu2+ phosphor is a kind of potential green-emitting phosphor.