Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5397750 | Journal of Luminescence | 2017 | 5 Pages |
Abstract
A green emitting long afterglow phosphor Li2SrSiO4:Tb3+ was obtained via a conventional high temperature solid-state reaction in air atmosphere. X-ray diffraction (XRD), photoluminescence spectroscope (PLS), long afterglow spectroscope (LAS) and thermal luminescence spectroscope (TLS) were performed to characterize the physical properties of the phosphors. Typical 5D4-7Fj transitions of Tb3+ ions were detected by PL spectra, corresponding to CIE chromaticity coordinates of x=0.3161, y=0.5472. An optimal concentration of Tb3+ in the substrate was determined to be 1%. The Li2SrSiO4:Tb3+ phosphors showed a typical afterglow behavior when the UV source was switched off. A typical triple exponential decay behavior was confirmed after fitting the experimental data. Thermal simulated luminescence study further indicated that the afterglow behavior of Li2SrSiO4:Tb3+ phosphors was generated by the recombination of electrons with the holes resulted from the doping of rare-earth ions (Tb3+) in Li2SrSiO4 host. The long afterglow luminescence mechanism of Li2SrSiO4:Tb3+ is illustrated and discussed in details on the basis of the experimental results.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Xinyu Li, Chunxin Liang, Shaojie Guo, Yingjun Xiao, Chengkang Chang,