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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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Bibliographic Details
Published in:CrystEngComm 2017-11, Vol.19 (43), p.6498-655
Main Authors: Bai, Huayu, Song, Yan, Li, Dan, Ma, Qianli, Dong, Xiangting, Yu, Wensheng, Yang, Ying, Yu, Hui, Wang, Jinxian, Liu, Guixia
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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.
ISSN:1466-8033
DOI:10.1039/c7ce01418j