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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.
Singh, Vijay,Shinde, K.N.,Singh, N.,Singh, Pramod K.,Hakeem, D.A.,Nagpure, A.S. Elsevier 2018 OPTIK -STUTTGART- Vol.158 No.-
<P><B>Abstract</B></P> <P>This article deals with green-emitting Tb-doped Sr<SUB>2</SUB>ZnSi<SUB>2</SUB>O<SUB>7</SUB> phosphors. The Sr<SUB>2</SUB>ZnSi<SUB>2</SUB>O<SUB>7</SUB>:Tb<SUP>3+</SUP> phosphor is prepared using the sol-gel method. The structural characterizations of the Sr<SUB>2</SUB>ZnSi<SUB>2</SUB>O<SUB>7</SUB>:Tb<SUP>3+</SUP> phosphors were conducted using the XRPD and SEM analyses. The excitation and emission spectra signified that the phosphor could be effectively excited by a 239-nm ultraviolet excitation, and a green emission that is centered at 543 nm and that corresponds to the <SUP>5</SUP>D<SUB>4</SUB> → <SUP>7</SUP>F<SUB>5</SUB> transition was exhibited. Sound green emissions with the CIE chromaticity coordinates (0.2661, 0.43204) could be achieved. The Sr<SUB>1.95</SUB>ZnSi<SUB>2</SUB>O<SUB>7</SUB>:Tb<SUB>0.05</SUB> powder showed the highest emission intensity for the 239-nm excitation, indicating its potential applicability in the fields of lighting and displays.</P>