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Breaking the strong 1D growth habit to yield quasi-equiaxed REPO4 nanocrystals (RE = La–Dy) via solvothermal reaction and investigation of photoluminescence

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Abstract

Quasi-equiaxed REPO4 (RE = La–Dy) nanocrystals of either monoclinic (m-) or hexagonal (h-) structure, depending on the type of RE3+, have been successfully synthesized through solvothermal reaction in the presence of ethylene glycol (EG). Detailed characterization of the products was achieved by the combined XRD, FE-SEM, TEM, FTIR, TG/DTA, PLE/PL, and fluorescence decay techniques. The intrinsically strong 1D growth of the phosphates was gradually suppressed through increasing the solution pH and EG dosage, and the formation mechanism was elucidated with h-GdPO4 as a representative. The differences in the crystal structure, IR response and crystal size of the as-synthesized REPO4 crystals were interpreted in detail. It was shown that the phase purity and crystal morphology of h-GdPO4 can be well retained up to 700 °C, followed by a complete transition from the hexagonal to monoclinic phase at 900 °C. The photoluminescence properties of Dy3+-doped h-GdPO4 nanocrystals, including excitation, emission and fluorescence decay, were thoroughly investigated, and almost pure white-light luminescence was attained with similarly strong yellow (573 nm, 4F9/26H13/2) and blue (478 nm, 4F9/26H15/2) emissions of Dy3+ under excitation of the host Gd3+ ions at ∼274 nm.

Graphical abstract: Breaking the strong 1D growth habit to yield quasi-equiaxed REPO4 nanocrystals (RE = La–Dy) via solvothermal reaction and investigation of photoluminescence

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Publication details

The article was received on 30 Oct 2017, accepted on 03 Jan 2018 and first published on 03 Jan 2018


Article type: Paper
DOI: 10.1039/C7CE01880K
Citation: CrystEngComm, 2018, Advance Article
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    Breaking the strong 1D growth habit to yield quasi-equiaxed REPO4 nanocrystals (RE = La–Dy) via solvothermal reaction and investigation of photoluminescence

    Z. Wang, X. Shi, X. Wang, Q. Zhu, B. Kim, X. Sun and J. Li, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C7CE01880K

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