Photoluminescence and magnetic investigation of ternary ion activated enhanced multicolor LaF3 nanophasphores
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2017
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INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th
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The luminescence-tuneable multicolored LaF3:xCe3+,xGd3+,yEu3+ (x = 5; y = 1, 5, 10
and 15 mol%) nanoparticles have been synthesized via a new low cost polyol method. Powder
X-ray diffraction and high resolution transmission electron microscopy confirms the
hexagonal phase of LaF3:xCe3+,xGd3+,yEu3+ nanophosphors with average sizes (oval shape)
from 5-7 nm. Energy-dispersive X-ray spectroscopy analyses show the uniform distribution of
Ce3+, Gd3+ and Eu3+ dopants in the LaF3 host matrix. The photoluminescence spectra and
electron paramagnetic resonance measurement guarantee the presence of Eu2+, corroborated
through DC susceptibility measurements of the samples displaying the paramagnetic behavior
at 300 K, whereas a weak ferromagnetic ordering at 2 K. The non-radiative energy transfer
processes from the 4f1→4f5d1 state (Ce3+) (ultraviolet excitation, λex = 260 nm) to the
intraconfigurational 4f excited levels of rare earth ions and simultaneous emissions in visible
region from the 4f65d1 (Eu2+) and 5D0 (Eu3+) emitting level, leading to overlapped broad and
narrow emission bands, have been proclaimed. The energy transfer mechanism proposes
involvement of Gd3+ ion sub-lattice as bridge and finally trapping by Eu2+/3+, upon excitation
of Ce3+ ion. The calculation of experimental intensity parameters (2,4) have been discussed
and highest emission quantum efficiency (η = 85%) of Eu3+ ion for y = 10 mol% sample is
reported. The advantageous existence of Eu2+/Eu3+ ratio along with variously-doped
nanomaterials described in this work, exhibit tunable emission color in the blue-white-red
regions, highlighting their potential application in solid state lighting devices, scintillation,
and multiplex detection.
Como referenciar
SHRIVASTAVA, NAVADEEP; KHAN, L.U.; VARGAS, J.M.; OSPINA, CARLOS; COAQUIRA, J.A.Q.; ZOPPELLARO, GIORGIO; BRITO, H.F.; FELINTO, M.C.F.C.; SHARMA, S.K. Photoluminescence and magnetic investigation of ternary ion activated enhanced multicolor LaF3 nanophasphores. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th, August 27 - September 01, 2017, João Pessoa, PB. Abstract... p. 386-386. Disponível em: http://repositorio.ipen.br/handle/123456789/28646. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.