Study of Luminescence Dependence of ZnO and SiO\(_2\):Pr\(^3\)+ Nanophosphor Concentration and Temperature

Abstract

The emission peaks located at 890 and 1005 nm relate to the 1D2→F2,3,4 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 Pr3+ 1D2→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.