Energy transfer mechanism of Eu2+, Mn2+Doped lithium aluminate phosphor: Synthesis, Hirshfeld surface analysis and optical study

Abstract

The LiAlO2 phosphor doped with Eu2+ sensitizer ions and Mn2+ ions activator were synthesized by employing microwave-assisted solution combustion synthesis method (SCS), and structural correlation investigations were elaborated. The host material was characterized by XRD, FT-IR, SEM, TEM analysis and their spectroscopic studies by photoluminescence study. The structural correlation i.e., 3D Hirshfeld surface analysis and 2D fingerprint plots of the LiAlO2 phosphor were generated using crystal explorer-17 software in order to discuss strength of different bonds and their inter-contacts. The energy transfer from Eu2+ to Mn2+ ions through exchange interactions was explained by Dexter's exchange interactions. The energy transfer interactions are possibly due to dipole-dipole transitions was best demonstrated by linear fitting with n: 6 (R2 = 0.987). The chromaticity diagram explains the nature of the color spectrum of phosphor-based on their particular wavelengths. The energy transfer from Eu2+ ions to Mn2+ ions leads to wavelength tunable ability of the phosphor suitable for the development of warm white light LEDs.