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Issue 6, 2016
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Tuning the optical, electronic and luminescence properties of LaOCl:Eu3+via structural and lattice strain modulation

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Abstract

In this work, LaOCl:Eu3+ nanodisks have been successfully synthesized by a hydrothermal process followed by a subsequent heat treatment process. It is observed that the monotonous lattice contraction originating from the incorporation of Eu3+ into the LaOCl host matrix has a consequence on the structural variation and lattice strain modulation. Meanwhile, the lower Eu3+ doping content can induce the band gap narrowing of LaOCl, which is further confirmed by density functional theory (DFT) results. However, different to theoretical predictions, Eu3+ doped LaOCl nanodisks show a constantly narrowing band gap energy with increasing Eu3+ doping concentration as determined by UV-vis diffuse reflectance spectra, which is thought to be related to the increase in lattice strain. Futhermore, the Eu–O charge transfer band shifts to a low energy in the excitation spectra with increasing Eu3+ ion doping concentration, which can be attributed to the strengthening of the covalence of Eu–O bonds in the crystal structure environment of the LaOCl host matrix. For the Eu3+ doped LaOCl system, the luminescence intensity is influenced by the concentration quenching as well as the lattice strain. LaOCl:Eu3+ nanodisks exhibit good red emission properties with a maximum quantum efficiency of 87.4%. Thus, it is expected that the luminescence colors of Eu3+ doped LaOCl samples can be tuned by simply adjusting the relative doping concentration of Eu3+ ions, which might find potential applications in fields such as light display systems and optoelectronic devices.

Graphical abstract: Tuning the optical, electronic and luminescence properties of LaOCl:Eu3+via structural and lattice strain modulation

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Publication details

The article was received on 27 Oct 2015, accepted on 13 Dec 2015 and first published on 14 Dec 2015


Article type: Paper
DOI: 10.1039/C5CE02098K
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CrystEngComm, 2016,18, 907-916

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    Tuning the optical, electronic and luminescence properties of LaOCl:Eu3+via structural and lattice strain modulation

    L. Lv, T. Wang, S. Li, Y. Su and X. Wang, CrystEngComm, 2016, 18, 907
    DOI: 10.1039/C5CE02098K

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