Asian Journal of Physical and Chemical Sciences

The emission peaks located at 890 and 1005 nm relate to the ¹D₂→F_2,3,4 transitions, respectively. They detected these at 884 and 1060 nm when Pr3+ was added to SiO₂. The primary broad emission peak occurs at 309 nm in the UV spectral region; SiO₂ samples with Pr³⁺ concentrations of 0.05, 0.1, 0.2, and 0.5 mole% showed single exponential luminescence decay. These represent the luminescence decay curves for ZnO, SiO₂:0.2 mole% Pr³⁺ and ZnO emissions captured at room temperature. When the temperature increases from 8 K to 300 K, the lifetime of ¹D₂ decreases. The rapid decrease of the Pr^{3+ 1}D₂→³H₄ emission from SiO₂: Pr³⁺, which has a lifetime of 144 µs, indicated that both SiO₂:Pr³⁺ and ZnO exhibited similar emission characteristics from the Pr³⁺ ion, primarily featuring red emission peaks at 605 nm when excited by VUV light targeting the 4f, 5d state of the Pr³⁺ phosphors containing SiO₂ and Pr³⁺ particles. The ultraviolet spectrum from 200 to 300 nm relate to particles with diameters ranging from 2 to 10 nm. The ³H₆ and ³H₄ produce red lines at 605 and 614 nm, correspondingly.