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Enhanced hydrothermal crystallization and color tailorable photoluminescence of hexagonal structured YPO4:Sm/Tb nanorods

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Abstract

Hexagonal structured YPO4:Tb/Sm (h-YPO4:Tb/Sm) nanorods with significantly large aspect ratios of up to ∼32 have been successfully fabricated via hydrothermal crystallization in the presence of sodium malate (Mal2−) and superfluous PO43−. The combined techniques of XRD, SEM, TEM, and PLE/PL were employed to characterize the products, and the formation mechanism of the nanorods was discussed in detail. It was found that Mal2− and superfluous PO43− jointly ensured the crystallization of the metastable hexagonal phase, and the latter promoted the 1D growth of the crystals. The h-(Y0.99−xTb0.01Smx)PO4 ternary phosphors simultaneously displayed the green emission of Tb3+ at 545 nm and the red emission of Sm3+ at 601 nm under 221 nm UV excitation, with which the emission color was finely tuned from green to yellow by increasing the Sm3+ content. The Tb3+ → Sm3+ energy transfer in h-(Y0.99−xTb0.01Smx)PO4 was revealed to occur via an electric dipole–dipole interaction mechanism. The fluorescence lifetime of Tb3+ was found to steadily decrease with increasing Sm3+ concentration, and the efficiency of energy transfer was determined to be ∼31.2% at the optimal Sm3+ content of 4 at% (x = 0.04).

Graphical abstract: Enhanced hydrothermal crystallization and color tailorable photoluminescence of hexagonal structured YPO4:Sm/Tb nanorods

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Publication details

The article was received on 05 Feb 2018, accepted on 27 Feb 2018 and first published on 27 Feb 2018


Article type: Paper
DOI: 10.1039/C8CE00183A
Citation: CrystEngComm, 2018, Advance Article
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    Enhanced hydrothermal crystallization and color tailorable photoluminescence of hexagonal structured YPO4:Sm/Tb nanorods

    Z. Wang, X. Shi, X. Wang, Q. Zhu, X. Li, B. Kim, X. Sun and J. Li, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C8CE00183A

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