Spectroscopic and phonon side band analysis of Tb2−xEux(MoO4)3 nanophosphor

• First time report on the J-O analysis of Tb2−xEux(MoO4)3 nanophosphor.
• Theoretically predicted radiative parameters were confirmed experimentally.
• Phonon Side Band (PSB) analysis was carried in Tb2−xEux(MoO4)3 nanophosphor.
• Phonon energy and multiphonon relaxation rate was estimated by PSB analysis.
• Established the suitability of the material for photonic applications.

Theoretical calculation of the spectroscopic parameters of Tb2−xEux(MoO4)3 nanophosphor using Judd-Ofelt (J-O) theory and its experimental verification were presented along with Phonon side band (PSB) analysis. The intensity parameters, radiative properties and stimulated emission parameters of the samples were evaluated using J-O theory and are compared with experimental results. Raman spectroscopy was used to analyze the vibrational modes associated with the sample and the chemical composition was confirmed using energy dispersive spectroscopy (EDS). The phonon side band analysis and nonradiative decay due to multiphonon relaxation in Tb2−xEux(MoO4)3 were also reported. PSB are observed in the excitation spectra of Eu3+ at 446 and 427 nm, on monitoring the 5D0→7F2 transition at 612 nm. PSB in Eu3+ ions are associated with the 7F0→5D2 transition or zero phonon line, and are used to analyze the phonon energy, electron–phonon coupling strength and multiphonon relaxation of the sample. The correlation between Raman vibrational modes and PSB spectra were established. The photoluminescence excitation and emission spectra were used to study the luminescence properties of the sample. Under host excitation, the prepared sample exhibit the characteristic emission of Eu3+ corresponding to 5D0→7F1,2,3,4 transitions due to an energy transfer from MoO42− and Tb3+ to Eu3+. These studies indicate that Tb2−xEux(MoO4)3 phosphor is a promising material for photonic applications such as fluorescent lamps and color display fields.

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