| Popis: |
Multi-color single-phase white emission Sr 3 B 2 SiO 8 :Tm 3+ /Dy 3+ /Eu 3+ fluorescent powders were prepared by solid-state fritting method. The fluorescence performance of Tm 3+ , Dy 3+ and Eu 3+ ions single-activated Sr 3 B 2 SiO 8 phosphors were investigated and they exhibit desirable behaviors in their characteristic emissions. Meanwhile, the energy required for migration from Tm 3+ to Dy 3+ and from Dy 3+ to Eu 3+ in co-doped fluorescent substance was determined by the aids of steady-state and transient-state photoluminescence spectra /decay measurements. The energy transmission process from Tm 3+ to Dy 3+ and Dy 3+ to Eu 3+ has been explored to be a dipole–quadrupole interaction and a dipole-dipole interaction of the resonant type, respectively. More significantly, by tuning the molarity ratio of doping Dy 3+ /Eu 3+ ions, multicolor emission from yellow to red shall be achieved in Sr 3 B 2 SiO 8 :Dy 3+ , Eu 3+ phosphors for its potential adhibitions in solid-state lighting applications. The Sr 3 B 2 SiO 8 :Tm 3+ , Dy 3+ samples can implement white light emission by the appropriate changeable doping molar quantity of Tm 3+ and Dy 3+ , applying potentially in white LEDs. The energy migrations between co-doped rare earth ions play a decisive role in these processes. |
