Abstract
The Sr 2Al 2SiO 7:Eu 2+, Ce 3+ phosphors were synthesized by a high temperature solid-state reaction. Effective energy transfer occurs in Ce 3+ and Eu 2+ co-doped Sr 2Al 2SiO 7 due to large spectral overlap between the emission of Ce 3+ and excitation of Eu 2+ ions. Co-doping of Ce 3+ enhances the emission intensity of Eu 2+ greatly by transferring its excitation energy to Eu 2+ ions. The critical distance has been estimated to be about 1.83 nm by spectral overlap method. Furthermore, the developed phosphors can generate lights from blue to green region under the excitation of UV radiation by appropriately tuning the activator content. The Sr 2Al 2SiO 7:Eu 2+,Ce 3+ phosphors are promising phosphors for warm-white-light-emitting diode because of its effective excitation in the near ultraviolet range.
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