Hydrothermal synthesis and multicolor luminescence properties of Dy3+/Eu3+ co-doped KLa(MoO4)2 phosphors. Issue 6 (1st May 2016)

• Record Type: Journal Article
• Authors: Liu, Yun; Zuo, Haoqiang; Li, Jinyang; Shi, Xiaolei; Ma, Suiyan; Zhao, Minzhu; Zhang, Kun; Wang, Chenyu
• Is Part Of: Ceramics international. Volume 42:Issue 6(2016)
• Page Start: 7781
• Page End: 7786
• Publication Date: 2016-05-01
• Subjects: A. Hydrothermal method -- C. Multicolor luminescence -- D. Molybdate; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.01.210
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A series of Dy 3+ /Eu 3+ co-doped KLa(MoO4 )2 phosphors were synthesized by a hydrothermal method. The as-prepared samples were characterized by an X-ray diffraction (XRD), a field emission scanning electron microscope (FE-SEM), a photoluminescence (PL) excitation, emission spectra and decay curves. The samples have a single-phase monoclinic structure of KLa(MoO4 )2 and consist of microspheres with the mean size of 1.5 μm. Upon excitation at 389 nm, KLa(MoO4 )2 :Dy 3+ exhibits characteristic peaks at 485 nm and 576 nm. The optimal doping concentration of Dy 3+ is about 7 mol%. KLa0.93 −y (MoO4 )2 :0.07Dy 3+, y Eu 3+ samples show emission peaks of both Dy 3+ and Eu 3+ centered at 485, 576, 595 and 618 nm under 389 nm excitation. It can be found that the integrated emission intensity of Dy 3+ is decreased and the lifetime of Dy 3+ is declined with increasing Eu 3+ concentration, which is due to the energy transfer from Dy 3+ to Eu 3+ . Furthermore, according to Dexter's theory and Reisfeld's approximation, the quadrupole–quadrupole (q–q) interaction is the mechanism for energy transfer between Dy 3+ and Eu 3+ . Moreover, the chromaticity color coordinates of KLa0.93− y (MoO4 )2 :0.07Dy 3+, y Eu 3+ samples are tuned from the yellowish-white region to white light and eventually to the reddish-white region with increasing Eu 3+ content. This kind of multicolor tunable phosphors exhibits the great potential applications in the fields of white light diodes, full-color displays and optoelectronic devices.