Electrospinning synthesis and photoluminescence properties of SnO2:xEu3+ nanofibers

Abstract

SnO 2 :xEu 3+ (x=0, 1%, 3%, 5%, molar fraction) fibers were synthesized by electrospinning technology. The size of the as-prepared fibers is relatively uniform and the average diameter is about 200 nm with a large draw ratio. The as-prepared Eu 3+ doped SnO 2 nanofibers have a rutile structure and consist of crystallite grains with an average size of about 10 nm. A slight red shift of the A 1g and B 2g vibration modes and an additional peak at 288 nm were observed in the Raman spectra of the nanofibers. The energies of bandgaps of the SnO 2 nanofiber with Eu doping of 1% and 3% are 2.64 eV, and the energy of bandgap is 2.94 eV with Eu doping of 5%(molar fraction). There is only orange emission( 5 D 0 → 7 F 1 magnetic dipole transition) for Eu doped SnO 2 nanofibers, and no red emission could be observed. The orange emission upon indirect excitation splits into three peaks and the peak intensity at the excitation wavelength of 275 nm is higher than that at the excitation wavelength of 488 nm.

Long lasting phosphorescence properties and multi-peak fitting on thermoluminescence of red LaAlO3:Eu3+ phosphor

“…On the other hand, the characteristics emission lines at 592 nm( 5 D 0 → 7 F 1 ), 610 nm( 5 D 0 → 7 F 2 ) and 628 nm( 5 D 0 → 7 F 3 , all f-f emission) substantiate the presence of Eu 3+ in the sample. It also shows that magnetic dipole transition( 5 D 0 → 7 F 1 ) is prominent over the electric dipole transition( 5 D 0 → 7 F 2 ), which has been assigned to the occupancy of inversion symmetry sites by Eu 3+ ions in LaAlO 3 [8,9] . This result confirms that the Eu 3+…”

“…Eu 3+ [8,9] . On the other hand, the characteristics emission lines at 592 nm( 5 D 0 → 7 F 1 ), 610 nm( 5 D 0 → 7 F 2 ) and 628 nm( 5 D 0 → 7 F 3 , all f-f emission) substantiate the presence of Eu 3+ in the sample.…”