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Luminescence investigations on LiAl_5O_8:Tb^3+ nanocrystalline phosphors
Shreyas S. Pitale,Vinay Kumar,Indrajit Nagpure,O.M. Ntwaeaborwa,H.C. Swart 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Tb^3+-doped porous LiAl_5O_8 nanophosphors were successfully synthesized using a single step combustion method. Structural characterization of the luminescent material was carried out with X-ray diffraction (XRD) analysis and high resolution transmission electron microscopy (HRTEM). Surface composition was estimated from X-ray photoelectron and Auger spectroscopic techniques. The average particle size was estimated as 37 ± 3 nm. Luminescence properties were studied by the photoluminescence spectroscopy. The phosphor showed intense luminescence in the green region due to the magnetic dipole transition of 5^D_4→7^F_5 of the Tb^3+ ion at 543 nm under 241 nm excitation. The intense 4f―4f transitions of Tb^3+outshine the luminescence from host which would otherwise deteriorate the color quality of the display device under operation.