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Morphology-controlled facile surfactant-free synthesis of 3D flower-like BiOI:Eu3+ or Tb3+ microarchitectures and their photoluminescence properties
Corresponding authors
Department of Electronic Engineering, Institute for Wearable Convergence Electronics, Kyung Hee University, Yongin-si, Gyeonggi-do 446-701, Republic of Korea
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Tel: +82-31-201-3820
Three-dimensional (3D) flower-like bismuth oxyiodide (BiOI) and Eu3+ or Tb3+ ions single-doped BiOI microarchitectures were successfully synthesized by a facile and eco-friendly wet chemical method in an ethylene glycol solvent. The solvent played a significant role in the formation of the 3D flower-like BiOI microarchitectures with respect to temperature and time. The phase formation of the synthesized BiOI samples was examined by X-ray diffraction analysis, which confirmed a characteristic tetragonal crystal structure with the space group of P4/nmm. The growth mechanism was discussed based on the field-emission scanning electron microscope images obtained for the samples at different growth temperatures and growth times. 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 intense red emission peak at 616 nm due to the 5D0 → 7F2 electronic transition of Eu3+ ions under 255 nm excitation. Similarly, under 253 nm (f → d transition) excitation, the PL emission spectra of BiOI:Tb3+ samples exhibited 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 Internationale de l'Eclairage chromaticity coordinates were calculated for the optimized samples, which showed values close to those of commercial red- and green-emitting phosphors.
The article was
received on 09 Mar 2017,
accepted on 14 Jun 2017
first published on 15 Jun 2017
Article type:
J. Mater. Chem. C, 2017, Advance Article
ReferenceManager
Sk. K. Hussain, L. K. Bharat and J. Su Yu,
J. Mater. Chem. C, 2017, Advance Article
, DOI: 10.009E
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