Structural and photophysical investigation of gadolinium based Eu3 + doped Gd3GaO6 phosphor: A red emitter with high color purity for WLEDs application
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Date
2026
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Abstract
To understand different properties of Eu3+ions in inorganic phosphors, a series of red emitting Gd3GaO6:Eu3+
was synthesized via solution combustion method. XRD patterns supported by Rietveld refinement revealed
successful formation of crystalline sample with orthorhombic structure and Cmc21 space group. Microstructural
features and elemental mapping of samples were examined by means of FE-SEM and EDX techniques. Photo
luminescence spectra of Eu3+-activated Gd3GaO6 revealed red emission at 612 nm due to the 5D0→7F2 transition
under excitation at 261 nm. A decrease in emission intensity was observed after doping levels exceed 4 mol%
indicating energy transfer between activator ions results in concentrating quenching governed via dipole-dipole
interactions. The intensity parameters Ω2 and Ω4 defined by Judd Ofelt theory were calculated utilizing emission
spectra to investigate coordination symmetry around Eu3+ions. The photoluminescence decay profile was well
described by bi-exponential decay function. The activation energy 0.19873 eV suggests good thermal stability of
GGO:4 mol% Eu3+phosphor. The high color purity (98.15 %) inferred from CIE coordinates revealed their
applicability in white light emitting diodes.