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Emerging LaOCN matrix with controllable 3D morphology for photoluminescence applications
La 2 O 2 CN 2 and La 2 O 2 CN 2 :RE 3+ (RE = Eu, Dy, Tb, Tm, and Yb/Er) complexes with special morphologies, having uniform rod-like, umbrella-like, cauliflower-like and mushroom-like microarchitectures, have been successfully synthesized by combining a simple hydrothermal route with cyanamidation t...
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Published in: | CrystEngComm 2017-11, Vol.19 (43), p.6498-655 |
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Main Authors: | , , , , , , , , , |
Format: | Article |
Language: | |
Online Access: | Get full text |
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Summary: | La
2
O
2
CN
2
and La
2
O
2
CN
2
:RE
3+
(RE = Eu, Dy, Tb, Tm, and Yb/Er) complexes with special morphologies, having uniform rod-like, umbrella-like, cauliflower-like and mushroom-like microarchitectures, have been successfully synthesized by combining a simple hydrothermal route with cyanamidation technology. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectra (EDX), and photoluminescence (PL) spectra were used to characterize the samples. The morphology regulation of the products was realized
via
simply adjusting a series of experimental parameters, including sodium citrate amount, reaction temperature and pH value of the initial solution; the growth mechanisms have been proposed. Under ultraviolet light excitation, the as-obtained La
2
O
2
CN
2
:RE
3+
(RE = Eu, Dy, Tb, Tm) products successfully exhibit downconversion emissions showing different fluorescence colors based on the characterized transitions of different rare earth ions. Additionally, upon 980 nm laser excitation, La
2
O
2
CN
2
:Yb/Er phosphors have strong upconversion emissions. La
2
O
2
CN
2
microstructures are therefore excellent matrixes, and the as-synthesized La
2
O
2
CN
2
:RE
3+
samples have potential applications in fluorescent lamps, field emission displays, biological labeling and catalysis.
Shape-controlled La
2
O
2
CN
2
microstructures are synthesized and are used as hosts for doping with various RE
3+
to realize different colored emissions. |
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ISSN: | 1466-8033 |
DOI: | 10.1039/c7ce01418j |