Tunable emission and energy transfer of Sm³⁺/Eu³⁺ activated/ co-activated Mg₂₁Ca₄Na₄(PO₄)₁₈ phosphors for warm light emitting diodes and display applications

In the present period, phosphates are the new contenders for luminescence. In the proposed research article, simple combustion method using citric acid as a fuel was employed for the preparation of Sm³⁺, Eu³⁺ activated/co-activated Mg₂₁Ca₄Na₄(PO₄)₁₈ phosphor. XRD of prepared phosphor is investigated. SEM is used to evaluate the proposed phosphor's morphology and elemental composition alongside elemental analysis of the sample. The proposed phosphors' vibrational properties were confirmed using Fourier Transform Infrared Spectroscopy (FTIR). Sm³⁺ and Eu³⁺ doped Mg₂₁Ca₄Na₄(PO₄)₁₈ phosphors shows orange and red emission. By satisfying the energy transfer criteria of spectral overlap the energy transfer has been done from Sm³⁺ to Eu³⁺. The proposed energy transfer photoluminescence research reveals three contiguous emission peaks in the visible range that emits white light. All of these findings support the produced phosphor's suitability for use in WLEDs and display applications.