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Morphology-controlled facile surfactant-free synthesis of 3D flower-like BiOI:Eu3+ or Tb3+ microarchitectures and their photoluminescence properties

Abstract

Three-dimensional (3D) flower-like bismuth oxyiodide (BiOI) and Eu3+ or Tb3+ ions single-doped BiOI microarchitectures were successfully synthesized by a facile eco-friendly wet chemical method in ethylene glycol solvent. The solvent played a significant role in the formation of 3D flower-like BiOI microarchitectures with respect to temperature and time, respectively. The phase formation of the synthesized BiOI samples was examined by X-ray diffraction pattern analysis, which confirmed a characteristic tetragonal crystal structure with space group P4/nmm. The growth mechanism was discussed from the field-emission scanning electron microscope images collected for the samples at different growth temperatures and growth time intervals, respectively. The crystallinity of the BiOI sample was confirmed by field-emission transmission electron microscope images. The photoluminescence (PL) properties were analyzed for the Eu3+ or Tb3+ single-doped BiOI 3D flower-like microarchitectures. The PL emission spectra of BiOI:Eu3+ samples showed an intense red emission at 616 nm due to the 5D0 → 7F2 electronic transitions of Eu3+ ions under 255 nm excitation. Similarly, under 253 nm (f → d transition) excitation, the PL emission spectra of BiOI:Tb3+ samples exhibited the intense green emission peak at 545 nm corresponding to the f→ f transitions of Tb3+ ions. Additionally, the temperature-dependent PL emission spectra were studied for the optimized BiOI:0.07Eu3+ and BiOI:0.02Tb3+ samples, indicating good thermal stability. The Commission International de I'Eclairage chromaticity coordinates were calculated for the optimized samples, which shows the values closer to commercial red- and green-emitting phosphors.

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Supplementary files

Publication details

The article was received on 09 Mar 2017, accepted on 14 Jun 2017 and first published on 15 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC01009E
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Morphology-controlled facile surfactant-free synthesis of 3D flower-like BiOI:Eu3+ or Tb3+ microarchitectures and their photoluminescence properties

    K. H. Shaik, L. K. Bharat and J. S. Yu, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01009E

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