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Luminescence studies on the blue–green emitting Sr4Al14O25:Ce3+phosphor synthesized through solution combustion route

Journal of Luminescence
Publication Date
DOI: 10.1016/j.jlumin.2008.09.002
  • Strontium Aluminate
  • Charge Transfer Process
  • Phosphorescence Decay
  • Tm–Tstop
  • Cgcd


Abstract New blue–green emitting Sr 4Al 14O 25:Ce 3+ phosphor is reported in this paper. The polycrystalline samples of phosphor were prepared by the conventional solution combustion method and checked for crystallization and phase by X-ray diffraction. Photoluminescence studies reveal the emission at 472 and 511 nm that correspond to the transition between lowest T 2g level of the 5d state to the 2F 5/2 and 2F 7/2 ground state levels of the Ce 3+. The excitation at 275 nm corresponds to O 2−→Ce 4+ charge transfer processes to lowest 5d state of Ce ion (T 2g). Phosphorescence decay procedures reveal the existence of slow, medium, and fast component involved in the process. Varying the γ-dose (1–6 Gy), thermoluminescence (TL) measurements were made and glow curve maximum is obtained at 383 K. The phosphor seems to follow a first-order kinetics due to non-shifting T m property. The T m– T stop method followed by the repeated initial rise method is applied to determine the distribution of activation energies and corresponding maximum positions. Chi-square minimization procedures provide the appropriate peak positions and other trapping parameters. From deconvolution results, the activation energies are found to be 0.84 and 1.06 eV, while the frequency factor is of the order of 10 10 and 10 11 s −1, respectively.

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