Impact of LaF3 and silica shell formation on the crystal, optical and photo-luminescence properties of LaF3:Ce/Tb nanoparticles

被引:11
作者
Ansari, Anees A. [1 ]
Rai, Monika [2 ]
Rai, S. B. [2 ]
机构
[1] King Saud Univ, King Abdullah Inst Nanotechnol, Riyadh 11451, Saudi Arabia
[2] Banaras Hindu Univ, Dept Phys, Varanasi 221005, Uttar Pradesh, India
关键词
LUMINESCENCE PROPERTIES; CAMOO4; NANOPARTICLES; NANOCRYSTALS;
D O I
10.1039/c6qm00205f
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
LaF3:Ce/Tb and LaF3:Ce/Tb@LaF3 core and core/shell nano-structures were synthesized by the polyol process at low temperature. X-ray diffraction patterns, transmission electron microscopy images, energy dispersive X-ray, FTIR, UV/Vis, and photoluminescence spectra and band gap energy were used to investigate the impact of shell formation on the crystal structure, opto-electronic, photoluminescence and lifetime properties of the core-nanoparticles (core-NPs). The TEM image shows that the as-prepared luminescent core and core/shell/SiO2-NPs consist of polycrystals aggregated with a narrow size distribution, which can be easily dispersed in aqueous and non-aqueous solvents to form a transparent colloidal solution. The TEM image illustrated that the core and core/shell/SiO2 NPs are irregular hexagonals with a mean diameter of 20-35 nm. It is observed that the band gap energy gradually decreased after shell formation which may be due to the decreased crystallinity of the luminescent nanoproducts. The excitation spectra show a characteristic charge transfer transition of Ce3+ 4f-5d(275) and all excitations of Tb(3+7)7F(6)-> D-5(j)(D-7(j) = 1-6) ions, respectively. The excitation, emission and decay time clearly revealed that the luminescence efficiency was greatly enhanced after inert shell formation, whereas after silica surface modification the luminescence efficiency decreased because non-radiative decay is higher in core and core/shell NPs.
引用
收藏
页码:727 / 734
页数:8
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