Enhanced Luminescence of Ca ₁₄ Mg ₂ Si ₈ O _28+δ N _4−δ : Eu ²⁺ Phosphors by Codoping Ce ³⁺ , Mn ²⁺ for White LED s and Their Energy‐Transfer Mechanism

Abstract

The Eu 2+ , M ‐codoped( M = Ce 3+ , Mn 2+ ) phosphor powders were prepared by a solid‐state reaction. The addition of Ce 3+ in the Eu 2+ 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 Eu 2+ to Mn 2+ . Ce 3+ –Eu 2+ and Eu 2+ –Mn 2+ 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.