Thermo, Photo and Mechanoluminescence Studies of Eu3+ Doped Y4Al2O9 Phosphors: TL, PL, and ML Analysis of YAM: Eu3+

Thermo, Photo and Mechanoluminescence Studies of Eu3+ Doped Y4Al2O9 Phosphors: TL, PL, and ML Analysis of YAM: Eu3+

Shubha Tripathi (Dr. C. V. Raman University, India), Manish Kumar Mishra (Bhilai Institute of Technology Raipur, India), Vikas Kumar Jain (Government Engineering College, India), Ratnesh Tiwari (Bhilai Institute of Technology Raipur, India) and Neha Dubey (Government V. Y. T. Post Graduate Autonomous College, India)
Copyright: © 2018 |Pages: 26
DOI: 10.4018/978-1-5225-5170-6.ch010

Abstract

The chapter reports synthesis and characterization of europium-doped Y4Al2O9 phosphor for display and dosimetric applications. The europium-activated Y4Al2O9 (YAM) phosphor is synthesized via solid state reaction method. Synthesized phosphors were characterized by powder x-ray diffraction (PXRD) techniques, scanning electron microscopy (SEM) technique, and transmission electron microscopy (TEM) technique. Particle size calculated from TEM analysis and crystallite size was calculated by Scherer's formula. All synthesized phosphor for different concentration of europium ion were studied by photo, thermo, and mechanoluminescence study. It is found that for photoluminescence analysis of Eu3+ doped phosphor has prominent spectra in red region and electric dipole transition (5D0 → 7F2) dominant over the magnetic dipole transition (5D0 → 7F1) due to non-centro symmetry between rare earth ions. Broad excitation spectra found for photoluminescence study.
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Introduction

During the past decades, nanostructured materials have attracted considerable attention for their novel and enhanced properties, e.g., the Mn doped ZnS phosphor can yield both high luminescent efficiencies and short lifetime Bhargava et al. (1994) and Zhang et al. (1998). Nanostructured materials may be developed to form a novel type of luminescent materials for display applications.

The Y2O3–Al2O3 system is a promising material for refractory coatings and for ceramic and semiconductor processing technology Lo et al. (1998) and Aguilar et al. (2000). Doped yttrium aluminium garnet (YAG) is widely used as a laser host material Lupei et al. (2002) and Vodopyanov et al. (1998), and yttrium aluminumperovskite (YAP) used as scintillation host material Glodo et al. (2000). In addition, rare earth doped YAG is also employed as a phosphor Lu et al. (2002) and Choe et al. (2001). However, there are few reports on rare earth doped Y4Al2O9 (YAM). It has been reported that the space group for the crystal structure of Y4Al2O9 is P21/c of monoclinic Yamane et al. (1998 a & b). The Al atoms are coordinated to four oxygen atoms, the Y atoms are coordinated to either six or seven oxygen atoms Yamane et al. (1998 a & b), and its site symmetry is C1 Rabinovitch et al. (2004). There are four formula units in the unit cell of the room temperature phase of Y4Al2O9 and four different rare earth sites in the asymmetric unit. Xia et al. (2005) have synthesized the Y4Al2O9:Eu3+ phosphor through a sol–gel combustion method, where the Y4Al2O9 phase can form through sintering at 800 0C. However, higher doping concentration could be realized in Y4Al2O9:Eu3+nano-crystal host lattice. Shengli Liu et al. have also prepared the Y4Al2O9:(Tb3+, Eu3+) by sol–gel process Shengli and Su (1997) Wang et al. (2006), Kaur et al. (2012) and Dubey et al. (2013) have studied the VUV excitation and photoluminescence characteristics of this Y3.8Al2O9:Re0.2 (Re = Tb3+, Eu3+) phosphor synthesized via a citric-gel method. This phosphor shows strong absorption in VUV region. The results indicate that this phosphor could be one of the potential candidates for PDPs applications.

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