Issue 47, 2013

Band structure, shape controllable synthesis and luminescence properties of the precursor and final product Lu6O5F8:Eu/Tb/Ce/Dy nano/microstructures

Abstract

In the present paper, the band structure and density of states of Lu6O5F8 were primarily studied with the help of first-principles calculations, and the indirect band gap of Lu6O5F8 is estimated to be 4.13 eV wide. Lu(OH)1.57F1.43/NH4Lu2F7/Lu6O5F8 nano/microcrystals with diverse morphologies, sizes and dimensions have been synthesized via a mild and controllable hydrothermal process using citric acid trisodium salt dehydrate (Cit3−), hexadecyltrimethylammonium bromide (CTAB), ethylenediaminetetraacetic acid (EDTA), ethylenediaminetetraacetic acid disodium salt (EDTA2−), sodium dodecyl benzene sulfonate (SDBS), ethylenediamine (EA) or polyvinylpyrrolidone (PVP), etc. as an additive, respectively. The phases, morphologies, sizes, and luminescence properties of the as-prepared samples were well characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) and cathodoluminescence (CL) spectroscopy, respectively. The results indicate that the phase, morphology, and size of Lu(OH)1.57F1.43/Lu6O5F8 can be tuned in a controlled manner by altering the amount or kinds of additives, the pH values of the initial solution, and the reaction time. Furthermore, the time-dependent morphology evolution shows that the resulting microrods, hexagonal prisms, flower clusters and spheres were synthesized by a dissolution–reconstruction formation mechanism. It is expected that the synthetic strategy can be extended to controllable synthesis of other types of nano/microcrystals as well. Upon ultraviolet (UV), vacuum ultraviolet (VUV) and electron beam excitation, the luminescence properties as well as the emission mechanisms of the Ln3+ (Ln = Eu/Tb/Ce/Dy) single doped precursor (NH4Lu2F7, Lu(OH)1.57F1.43) and final product (Lu6O5F8) are all compared and studied. All in all, the multifunctional Ln3+ doped NH4Lu2F7/Lu(OH)1.57F1.43/Lu6O5F8 nano/microcrystals have potential applications in photoluminescence areas and field emission display devices.

Graphical abstract: Band structure, shape controllable synthesis and luminescence properties of the precursor and final product Lu6O5F8:Eu/Tb/Ce/Dy nano/microstructures

Supplementary files

Article information

Article type
Paper
Submitted
17 Sep 2013
Accepted
16 Oct 2013
First published
17 Oct 2013

J. Mater. Chem. C, 2013,1, 7952-7962

Band structure, shape controllable synthesis and luminescence properties of the precursor and final product Lu6O5F8:Eu/Tb/Ce/Dy nano/microstructures

L. Guo, Y. Wang, L. Han, Q. Qiang, W. Zeng, Z. Zou, B. Wang and X. Guo, J. Mater. Chem. C, 2013, 1, 7952 DOI: 10.1039/C3TC31838A

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