Abstract
The investigation involves preparation and photoluminescence properties of CeO2:Eu3+ (1–11mol%) nano phosphors by eco-friendly green combustion route using Euphorbia tirucalli plant latex as fuel. The final product was characterized by powder X-ray diffraction (PXRD), Scanning electron microcopy (SEM) and Transmission electron microscopy (TEM). The PXRD and SEM results reveals cubic fluorite phase with flaky structure. The crystallite size obtained from TEM was found to be ∼20–25nm, which was comparable to W–H plots and Scherrer’s method. Photoluminescence (PL) emission of all the Eu3+ doped samples shows characteristic bands arising from the transitions of 5D0→5FJ (J=0, 1, 2, 3, 4) manifolds under excitation at 373 and 467nm excitation. The 5D0→7F2 (613nm) transition often dominate the emission spectra, indicating that the Eu3+ cations occupy a site without inversion center. The highest PL intensity was recorded for 9mol% Eu3+ ions with 5ml latex. PL quenching was observed upon further increase in Eu3+ concentration. The international commission on illumination (CIE) chromaticity co-ordinates were calculated from emission spectra, the values (x, y) were very close to national television system committee (NTSC) standard values of pure red emission. The results demonstrate that the synthesized phosphor material could be very useful for display applications. Further, the phosphor material prepared by this method was found to be non toxic, environmental friendly and could be a potential alternative to economical routes.
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