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Novel reddish-orange color emitting Ca2SiO4:Sm3+ phosphors for white LED applications prepared by using agricultural waste
Journal of Luminescence ( IF 2.961 ) Pub Date : 2019-12-26 , DOI: 10.1016/j.jlumin.2019.116996
L. Lakshmi Devi; C.K. Jayasankar

Ca2SiO4:Sm3+ phosphors, where CaO and Si2O are synthesized from agricultural waste, are prepared through regular solid state reaction (SSR) technique. The XRD pattern confirmed their monoclinic structure and well matches with ICDD card No. 01-083-0464. The morphological studies through SEM images reveal that these were irregular in size and shape. Decay rates, emission and excitation spectra are measured to estimate the luminescent characteristics of Ca2SiO4:Sm3+ phosphors. The CIE chromaticity color coordinate values are evaluated and it is shown in reddish-orange region. The luminescence is quenched for doping concentration is above 0.2 mol % of the Sm3+ ion owing to energy transfer through non-radiative process among the Sm3+ ions at different sites. The decay curves for all concentrations exhibit single exponential nature only and lifetime values are increasing from 1.54 to 2.28 ms with decrease in concentration of Sm3+ ions from 0.3 to 0.01 mol %. These results suggest that the Ca2SiO4:Sm3+ phosphors were appropriate candidate for low cost white LED applications.
更新日期:2019-12-27

 

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