Luminescence enhancement of Tb3+ in Sr3SiO5:Eu2+ phosphor
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Sr3SiO5 phosphors co-doped with Eu2+ and Tb3+ were prepared by a conventional solid-state reaction method. The prepared Sr3SiO5:Eu2+,Tb3+,Li+ phosphors had characteristic luminescent spectra excited under near-UV excitation in which both the broadband spectrum assigned to Eu2+ and the line spectrum assigned to Tb3+ are observed, although Tb3+ is inactive with this photon energy in general. For Eu2+–Tb3+ codoped Sr3SiO5, energy transfer process takes place and the mechanism is ascribed to the overlap between the shorter Eu2+ luminescence band from the Sr3SiO5 crystal structure with two Sr sites and 5D4 energy level of Tb3+ ion. Due to the energy transfer, PL intensity of Eu2+ emission increased about 26 %. We suggest that this enhancement mechanism could shed light on the potential applications in white light-emitting diodes excited by near-UV light. In addition, the emission peak position near the orange region indicates that our system is a step towards a new class of wavelength sources for artificial lighting with improved PL intensity and lower energy consumption.
KeywordsEnergy Transfer Energy Transfer Process Prepared Phosphor Sr2SiO4 Yellow Phosphor
We are thankful to the financial support from the National Natural Science Foundations of China (21141001, 51272151), and the Fundamental Research Funds for the Central Universities (GK20111004).