TY - JOUR
T1 - Near UV excitable Eu-doped alumina nanophosphors synthesized by the microwave assisted solvothermal technique
AU - Padilla-Rosales, I.
AU - Cabanas-Moreno, J. G.
AU - Jiménez, G. L.
AU - Aguilar-Frutis, M. A.
AU - Alarcón-Flores, G.
AU - Falcony, C.
N1 - Publisher Copyright:
© 2017 IOP Publishing Ltd.
PY - 2017/12
Y1 - 2017/12
N2 - Europium doped alumina nanophosphors have been synthesized by the microwave assisted solvothermal technique. The dependence of the photoluminescence response and structural features of these nanophosphors on the europium content and annealing temperature has been characterized for a wide range of compositions and thermal treatments. The nanophosphors are composed of a mixture of nanocrystalline γ-Al2O3 and EuAlO3, in addition to an amorphous alumina phase. The relative quantities of each phase depend on both the europium content and the annealing temperature. High europium content and/or annealing temperature lead to larger fractions of EuAlO3 nanocrystals having with poor luminescence characteristics, while lower temperatures and europium contents result in the predominance of γ-Al2O3 nanocrystals and amorphous alumina, showing much more efficient luminescent emission. The luminescence spectra from all samples show the characteristic red emission peaks from the Eu3+ ion associated with inter-electronic energy level transitions. However, the excitation spectra in these nanophosphors are dominated, by the 7F0-5L6 transition (395 nm), as opposed to the dominant charge-transfer related band at ∼260 nm commonly reported for this material. The highest luminescence intensity was obtained for nanophosphors doped with 7.5 at.% of Eu, annealed at 900 °C, which exhibits a quantum yield of 45% when excited with 395 nm light.
AB - Europium doped alumina nanophosphors have been synthesized by the microwave assisted solvothermal technique. The dependence of the photoluminescence response and structural features of these nanophosphors on the europium content and annealing temperature has been characterized for a wide range of compositions and thermal treatments. The nanophosphors are composed of a mixture of nanocrystalline γ-Al2O3 and EuAlO3, in addition to an amorphous alumina phase. The relative quantities of each phase depend on both the europium content and the annealing temperature. High europium content and/or annealing temperature lead to larger fractions of EuAlO3 nanocrystals having with poor luminescence characteristics, while lower temperatures and europium contents result in the predominance of γ-Al2O3 nanocrystals and amorphous alumina, showing much more efficient luminescent emission. The luminescence spectra from all samples show the characteristic red emission peaks from the Eu3+ ion associated with inter-electronic energy level transitions. However, the excitation spectra in these nanophosphors are dominated, by the 7F0-5L6 transition (395 nm), as opposed to the dominant charge-transfer related band at ∼260 nm commonly reported for this material. The highest luminescence intensity was obtained for nanophosphors doped with 7.5 at.% of Eu, annealed at 900 °C, which exhibits a quantum yield of 45% when excited with 395 nm light.
KW - microwave assisted solvothermal technique
KW - photoluminescence
KW - red light emission nanophosphors
UR - http://www.scopus.com/inward/record.url?scp=85040059628&partnerID=8YFLogxK
U2 - 10.1088/2053-1591/aa9b67
DO - 10.1088/2053-1591/aa9b67
M3 - Artículo
SN - 2053-1591
VL - 4
JO - Materials Research Express
JF - Materials Research Express
IS - 12
M1 - 125007
ER -