Abstract
Eu2+-Yb2+ codoped SrSi2O2N2 phosphors were prepared and their photoluminescence properties were investigated in comparison with the single Eu2+-doped and the single Yb2+-doped samples. Their photoluminescence properties were investigated as the factors of Yb2+ ion concentration, excitation wavelength, and temperature. Compared to the single Yb2+-doped sample, the Eu2+-Yb2+ codoped sample showed improved emission intensity, fluorescence lifetime, quantum efficiency, and thermal stability. An efficient energy transfer process from Eu2+ ions to Yb2+ ions was proposed to be responsible for the enhancement. The highest energy transfer efficiency was estimated to be 91.9%. A broadband yellow emission with full width at half maximum of ∼170 nm was also observed in the Eu2+-Yb2+ codoped sample, which could be assigned to the co-excitation of Eu2+ and Yb2+ ions. In view of too low quantum efficiency and the considerable thermal quenching of the emission at the operation temperature of high-power LED (>1 W/mm2), the SrSi2O2N2:Eu2+/Yb2+ phosphor might be only potential for low-power high Ra pc-white LED.
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