Enhanced Luminescence of Ca14 Mg2 Si8 O28+δ N4−δ: Eu2+Phosphors by Codoping Ce3+, Mn2+ for White LEDs and Their Energy-Transfer Mechanism.

The Eu2+, M-codoped( M = Ce3+, Mn2+) phosphor powders were prepared by a solid-state reaction. The addition of Ce3+ in the Eu2+ sites in partially nitridated bredigite-structure phosphor( CMSN) remarkably enhances the luminescent intensity by ~180% through sensitized luminescence. Dual band emission was observed for Eu, Mn-codoped CMSN through energy transfer from Eu2+ to Mn2+. Ce3+-Eu2+ and Eu2+-Mn2+ energy-transfer mechanism was investigated through decay profile analysis using Inokuti-Hirayama model and energy-transfer parameters are determined. Interaction mechanism was identified as dipole-dipole interaction. In addition, phosphor in glass plates was prepared using the phosphor and its feasibility in white LED application was studied and is presented. [ABSTRACT FROM AUTHOR]