An auto-combustion synthesis and luminescence properties of polyhedral YVO 4 : Ln 3+ (Ln = Eu, Sm, Yb/Er, Yb/Tm) microcr
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An auto-combustion synthesis and luminescence properties of polyhedral YVO4: Ln3+ (Ln = Eu, Sm, Yb/Er, Yb/Tm) microcrystals Shanshan Yang1, Linwen Jiang2,a), Junli Feng3, Jiangtao Li1, Xin Chen1, Mingyu He1, Hongbing Chen1 1
State Key Laboratory Base of Functional Materials and Its Preparation Science, Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province, Ningbo University, Ningbo 315211, People’s Republic of China State Key Laboratory Base of Functional Materials and Its Preparation Science, Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province, Ningbo University, Ningbo 315211, People’s Republic of China; and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People’s Republic of China 3 Shenzhen Customs, Industrial Products Inspection Technology Center, Shenzhen 518067, People’s Republic of China a) Address all correspondence to this author. e-mail: [email protected] 2
Received: 21 July 2019; accepted: 30 August 2019
Polyhedral YVO4: Ln3+ (Ln = Eu, Sm, Yb/Er, Yb/Tm) microcrystals were fabricated via a facile sol–gel autocombustion method using NH4VO3 as vanadium source in the presence of glycine. The X-ray diffraction patterns were well matched with pure YVO4, and the doped lanthanide ions did not change the host structure. The YVO4 microcrystals annealed from 500 to 1000 °C for 3 h were polyhedral and ranged in particle size from 0.1 to 2 lm. The luminescence properties of YVO4: Ln3+ (Ln = Eu, Sm, Yb/Er, Yb/Tm) samples indicated that all of the YVO4: Ln3+ samples exhibited typical emission spectra of Ln3+ cations, suggesting that the Ln3+ cations were well doped in YVO4 and could be excited efficiently through matrix absorption. In addition, the corresponding mechanisms of emission and energy transfer in the YVO4: Ln3+ are proposed.
Introduction Nowadays, lanthanide-doped luminescence materials have become an important theme in materials science [1]. As a result of the wide range of emission wavelength and excellent luminescence performance [2], lanthanide ion (Ln31)–activated phosphors have many potential applications in lighting [3], bio-labels, and optoelectronic displays [4, 5]. The phosphors usually contain host matrix materials and incorporated dopants, in which the dopants play the role of luminescence centers and the host matrices determine the crystal fields. Thus, the properties of host matrices have prominent effects on the energy transfer process of luminescent materials [1]. At present, a wide range of host matrices, such as phosphates, fluorides, oxides, and vanadates, have been utilized as efficient luminescence hosts. In particular, metal vanadates are an important optical host material, possessing many excellent physical characteristics, such as optical properties, electrical properties, optoelectronic properties, and magnetic properties. Particularly, the optical properties play an important role in
ª Materials Research Society 2019
lighting and display fields, such as fluorescence markers, biologica
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