Synthesis and effect of Dy 3+ doping on vibrational and luminescent properties of Mg 2 Zn(PO 4 ) 2
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Synthesis and effect of Dy3+ doping on vibrational and luminescent properties of Mg2Zn(PO4)2 Rubby Mahajan1 · Ram Prakash1 Received: 4 December 2019 / Accepted: 17 January 2020 / Published online: 28 January 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Dy3+ (0–5 mol%)-activated M g2Zn(PO4)2 phosphors were prepared via solution combustion method. Their structural, vibrational, and optical properties were investigated. The X-ray diffraction (XRD) results indicate that the synthesized sample consists of MgZn2(PO4)2 and Mg3(PO4)2. Fourier transformation infrared (FTIR) spectroscopy results show the existence of orthophosphate groups in the sample. The photoluminescence (PL) result suggests that the prepared samples give yellowish-white emission under UV excitation (348 nm). The optimum molar concentration (maximum emission intensity) of Dy3+-doped Mg2Zn(PO4)2 occurs at 2 mol%, and further, the increase in concentration of dopant causes concentration quenching effect. The concentration quenching phenomenon happened because of dipole–dipole interaction between dopant ions. The optical band gap of these samples is obtained from the diffuse reflectance spectrum (DRS) and found in the range of 5.07–5.33 eV. The values of refractive index and dielectric constant of optimum concentration of D y3+ ion (2 mol%) doped in the host lattice are obtained to be 1.972 and 3.889, respectively.
1 Introduction The progress in material technology, rare-earth-activated inorganic materials or phosphors has growing extreme attraction for researchers to produce white light for solidstate lighting application. The fourth generation of white light-emitting diodes has wonderful properties such as Hgfree, long life-span, high efficiency, less energy consuming, and eco-friendly[1, 2]. A phosphor is commonly made of a host and a dopant ion called as an impurity ion, i.e., a host is composed of transparent microcrystalline material, and luminescence center is formed by doping of foreign atom in the host lattice [3]. The properties of phosphor material are very essential to increase the luminous efficiency such that the visible light is emitted from phosphor material with less loss. The characteristics of phosphors like microstructure as well as surface uniformity are affected by the shape and grain size of the material. So, the properties of the phosphor material give us knowledge about the pathway for generated light when it is emitted from the phosphor material [4].
* Ram Prakash [email protected]; [email protected] 1
School of Physics, Shri Mata Vaishno Devi University, Katra, J&K 182320, India
A large number of rare-earth and divalent transition metal ions are used as dopant ion in phosphors because it acts as luminescent center in the host materials [3]. Numerous rare-earth-doped host materials have been studied by many researchers but rare-earth-doped phosphates become known as attractive host materials for solid-state lighting application. They have superior characteristics such as ea
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