Issue 39, 2013

Highly uniform and monodisperse GdOF:Ln3+ (Ln = Eu, Tb, Tm, Dy, Ho, Sm) microspheres: hydrothermal synthesis and tunable-luminescence properties

Abstract

GdOF:Ln3+ (Ln = Eu, Tb, Tm, Dy, Ho and Sm) microspheres (1.5 μm) with high uniformity and monodispersity have been synthesized via a facile hydrothermal method followed by heat treatment (600 °C). X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), as well as photoluminescence (PL) and cathodoluminescence (CL) spectra are used to characterize the resulting samples. A series of controlled experiments indicate that sodium citrate (Cit3−) as a shape modifier introduced into the reaction system plays a critical role in the shape evolution of the final products. Furthermore, the shape and size of the products can be further manipulated by adjusting the dosage of Cit3− and pH values in the initial solution. The possible formation mechanism for these microspheres has been presented. Under UV light and low-voltage electron beam excitation, GdOF:Ln3+ microspheres show the characteristic f–f transitions of Ln3+ (Eu, Tb/Ho, Tm, Dy and Sm) ions and give bright red, green, blue, yellow and yellowish-orange emission, respectively. In addition, multicolored luminescence containing white emission have been successfully confected for co-doped GdOF:Ln3+ phosphors by changing the doped Ln3+ ions and adjusting their doping concentrations due to the simultaneous luminescence of Ln3+ in the GdOF host, making these materials have potential applications in field-emission display devices.

Graphical abstract: Highly uniform and monodisperse GdOF:Ln3+ (Ln = Eu, Tb, Tm, Dy, Ho, Sm) microspheres: hydrothermal synthesis and tunable-luminescence properties

Article information

Article type
Paper
Submitted
14 Jun 2013
Accepted
22 Jul 2013
First published
22 Jul 2013

Dalton Trans., 2013,42, 14140-14148

Highly uniform and monodisperse GdOF:Ln3+ (Ln = Eu, Tb, Tm, Dy, Ho, Sm) microspheres: hydrothermal synthesis and tunable-luminescence properties

Y. Zhang, X. Kang, D. Geng, M. Shang, Y. Wu, X. Li, H. Lian, Z. Cheng and J. Lin, Dalton Trans., 2013, 42, 14140 DOI: 10.1039/C3DT51576A

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