| Synthesis and Optoelectronic Characteristics of
MGdAl3O7:Eu3+ Nanophosphors for Current
Display Devices |
Sonika Kadyan,a Sitender Singh,a Suman Sheoran,a Anura Samantilleke,b
Bernabe Maric and Devender Singha, b, *
Pages : 219-226
DOI : 10.1080/0371750X.2019.1690583 |
| Abstract |
| Novel Eu3+ doped MGdAl3O7 (M = Mg, Ca, Sr and Ba) phosphors were synthesized
and examined. The samples were prepared at 600oC using solution-combustion
procedure and investigated at 0.01 to 0.05 mole of dopant ion concentration. The
optimal concentration of Eu3+ ions was 0.03 mole for MGdAl3O7 host matrix. On
393 nm excitation, the materials exhibited sharp red emission at 608-614 nm
because of 5D0ï‚®7F2 (electric dipole allowed) transition. Structural and phase purity
of the materials were determined by X-ray diffraction (XRD) analysis. XRD patterns
of the phosphors exhibited single-phase tetragonal structure with P421m space
group. Significant rise in the luminous intensity and crystallinity of the materials
was observed with increase in temperature. Shape and size of the crystallites
were confirmed by transmission electron microscopy (TEM). TEM image displayed
spherical crystallites of 14-30 nm size. FTIR spectra of CaGdAl3O7 exhibited various
stretching modes at 455, 699 and 776 cm–1 comparable to Ca-O, Gd-O and Al-O.
Eu3+ doped MGdAl3O7 could be brilliant materials for applications in white lightemitting
diodes, fluorescent panels and modern display devices.
[Keywords: Solution combustion, MGdAl3O7:Eu; Luminescent, Tetragonal] |
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